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Paleoflood Investigations to Improve Peak-Streamflow Regional-Regression Equations for Natural Streamflow in Eastern Colorado, 2015

By Michael S. Kohn, Michael R. Stevens, Tessa M. Harden, Jeanne E. Godaire, Ralph E. Klinger, and Amanullah Mommandi

Prepared in cooperation with the Colorado Department of Transportation

Scientific Investigations Report 2016–5099

U.S. Department of the Interior U.S. Geological Survey 6 Paleoflood Investigations to Improve Peak-Streamflow Regional-Regression Equations, Eastern Colorado, 2015 S 9.80 1.79 4.14 1.99 3.25 7.39 2.65 2.23 7.22 8.34 7.78 5.53 3.01 3.03 7.00 9.31 4.71 (%) 37.4 33.0 29.5 32.8 19.2 10.2 36.3 20.2 33.7 36.4 24.3 36.7 18.8 31.8 25.6 24.9 30.5 40.6 13.6 14.9 31.5 29.8

100 P (in.) 6 3.63 4.89 4.45 3.86 3.03 3.02 2.93 3.29 3.26 3.24 3.23 3.27 3.12 3.38 3.15 3.44 3.72 4.76 4.24 4.37 3.56 2.55 3.21 3.13 3.72 3.64 2.46 2.38 2.59 2.45 2.81 3.88 2.56 3.33 4.27 4.05 3.79 3.98 3.99

out (ft) E 6,170 5,600 5,125 5,220 5,715 7,130 6,050 6,540 4,860 5,292 5,710 6,270 5,750 5,300 4,843 5,330 3,590 2,737 5,230 3,680 5,585 7,080 6,740 5,718 6,150 5,608 6,910 5,735 4,450 5,650 6,240 3,310 6,091 5,700 3,251 3,336 6,350 5,630 4,302 C (%) 5.20 12.5 16.8 14.7 15.7 18.3 16.1 15.7 18.3 18.6 12.6 12.6 14.0 12.6 13.7 14.1 15.7 16.7 22.1 25.1 21.4 14.4 16.0 17.0 18.9 17.9 17.4 17.0 13.4 17.3 20.6 12.2 17.5 18.0 18.8 10.9 15.0 21.7 25.3 ) 2 3.90 0.60 7.60 1.83 6.80 1.30 8.16 2.70 A 85.1 18.9 13.5 15.2 52.0 24.2 19.8 43.6 50.2 60.0 26.2 115 (mi 134 100 538 257 448 216 303 103 168 360 392 898 476 1,216 3,307 1,960 1,700 2,370 1,383 , square miles; C, amount of soil consisting clay 2 No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No Yes Yes Yes Yes Yes Yes Yes Yes Yes data flood Paleo- 7 18 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA peaks NDNR 22 20 14 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA peaks CDWR 11 11 11 14 29 17 26 36 23 62 29 16 12 22 23 22 72 25 30 27 82 30 13 28 74 30 19 62 24 20 21 63 72 17 43 83 10 10 108 USGS peaks degrees) (decimal Longitude –104.0811 –105.2653 –105.1844 –105.2047 –105.2522 –105.1944 –104.8286 –105.0150 –105.3389 –105.3039 –105.3486 –105.3262 –105.2772 –103.8931 –104.0808 –102.4050 –100.2404 –103.4436 –102.2694 –101.9675 –105.3369 –105.2322 –105.1686 –104.7633 –104.8225 –105.3997 –105.2489 –105.2600 –104.8764 –105.2291 –104.8839 –102.1747 –105.1758 –105.1336 –105.0029 –102.0513 –104.4755 –104.1633 –103.8755 41.1311 40.0117 40.4189 40.4344 40.2572 40.7875 41.1264 40.1522 40.4333 40.1255 40.0187 39.8778 41.2278 41.3197 41.0333 40.7050 39.5200 39.9067 40.0292 39.6332 39.6158 39.6355 39.3558 39.6050 39.7489 39.7505 40.2180 42.3258 42.2158 41.4558 41.3369 39.4089 39.5489 39.4844 40.0694 39.3372 39.4925 40.2828 41.2564 Latitude (decimal degrees) , mean basin 6-hour, 100-year precipitation; in., inches; S, mean basin slope; Wyo., Wyoming; Nebr., Nebraska; Colo., Colorado; Kans., Kansas; Nebr., Wyoming; Wyo., 100-year precipitation; in., inches; S, mean basin slope; , mean basin 6-hour, 100 P 6 Streamgage name , elevation of basin outlet; ft, feet; out E Cedar Creek at Cove, Colo. Buckhorn Creek near Masonville, Colo. Thompson River near Berthoud, Colo. Little North Fork Cache La Poudre River at Livermore, Colo. Wyo. South Crow Creek near Hecla, Wyo. Crow Creek at 19th Street, Cheyenne, Boulder Creek at Mouth near Longmont, Colo. Thompson River at Drake, Colo. North Fork Big Left Hand Creek near Boulder, Colo. Left Hand Creek near Boulder, Colo. Vado, Bummers Gulch near El Fourmile Creek at Orodell, Colo. Colo. Coal Creek near Plainview, Lodgepole Creek at Bushnell, Nebr. Wyo. Albin, Number 2 near Tributary Lodgepole Creek Lodgepole Creek at Ralton, Nebr. North Fork Plum Creek Tributary near Farnam, Nebr. Tributary North Fork Plum Creek Colo. near Shaw, Tributary Arikaree North Fork North Fork Black Wolf Creek near Vernon, Colo. Vernon, Creek near Wolf North Fork Black Arikaree River at Haigler, Nebr. Arikaree River at Haigler, Bear Creek above Evergreen, Colo. Bear Creek above Evergreen, Parmalee Gulch at Mouth, Indian Hills, Colo. Creek near Morrison, Colo. Turkey Cherry Creek near Franktown, Colo. Cherry Creek near Melvin, Colo. North Clear Creek above Mouth near Black Hawk, Colo. Clear Creek near Golden, Colo. Saint Vrain Creek at Lyons, Colo. Creek at Lyons, Vrain Saint Cottonwood Creek at Wendover, Wyo. Cottonwood Creek at Wendover, Rabbit Creek near Wheatland, Wyo. Wyo. near Little Bear, Tributary Horse Creek Blue Creek near Lewellen, Nebr. North Fork South Platte River at Platte, Colo. Deer Creek near Littleton, Colo. Plum Creek near Louviers, Colo. North Fork Republican River at Colorado-Nebraska State Line Kiowa Creek at Kiowa, Colo. Middle Bijou Creek Tributary near Deer Trail, Colo. Trail, near Deer Tributary Middle Bijou Creek Bijou Creek near Fort Morgan, Colo. Bijou Creek near Fort Morgan, Lodgepole Creek Tributary near Pine Bluffs, Wyo. near Pine Bluffs, Tributary Lodgepole Creek Summary of the streamgages used in regression analysis natural streams eastern Colorado, 2015.

USGS number streamgage 06736650 06739500 06742000 06751490 06755000 06755960 06758200 06730500 06736000 06724500 06726900 06727500 06730300 06762500 06762600 06763500 06767200 06821300 06821400 06821500 06710385 06710990 06711000 06712000 06712500 06718550 06719500 06724000 06655000 06668040 06675300 06687000 06707000 06708500 06709500 06823000 06758700 06759100 06761900 in basin; %, percent; Table 1. Table A, drainage area; mi Resources; NDNR, Nebraska Department of Natural Water [USGS, U.S. Geological Survey; CDWR, Colorado Division of Okla., Oklahoma; N. Mex., New Mexico; Tex., Texas; NA, not applicable] Texas; Tex., Okla., Oklahoma; N. Mex., New Mexico; Methods for Data Development for Streamgages 7 S 8.06 1.57 1.00 2.61 3.16 4.73 5.08 3.54 8.38 8.91 6.30 6.74 6.26 4.32 2.77 2.98 2.09 2.06 3.77 1.59 3.70 2.58 2.13 2.69 1.55 2.43 (%) 11.6 21.9 18.7 13.7 19.3 19.0 13.6 18.6 18.8 10.6 26.0 34.9 22.5

100 P (in.) 6 4.53 4.55 4.63 4.54 4.72 4.77 3.42 4.74 4.85 4.83 4.84 4.71 4.46 4.38 4.44 4.61 4.65 4.75 4.52 4.56 4.54 4.55 4.26 4.56 4.63 4.56 4.52 4.28 3.19 3.37 4.73 4.92 4.88 4.63 4.57 4.61 4.85 4.91 2.71

out (ft) E 2,625 2,520 2,548 2,381 2,377 3,440 7,690 3,590 2,722 2,538 2,440 2,840 2,741 2,920 2,555 2,503 2,370 2,320 2,780 2,722 2,760 2,640 3,189 3,680 3,720 3,750 2,670 3,130 5,254 5,660 2,520 3,130 2,335 3,070 2,638 2,623 2,840 2,593 6,780 C (%) 6.59 21.7 22.1 16.9 22.6 20.1 16.2 19.7 20.5 20.8 21.9 21.3 15.0 22.0 20.7 21.7 21.8 21.8 21.6 21.9 21.6 21.6 21.7 21.7 23.7 21.3 22.0 17.8 19.1 17.3 21.7 19.7 21.2 22.5 23.4 23.0 20.2 21.3 21.0 ) 2 6.70 9.10 7.53 A 11.3 74.5 21.6 52.0 85.7 20.1 31.7 10.2 30.2 69.0 42.0 13.8 31.8 25.6 14.6 49.6 211 (mi 770 321 446 320 361 177 269 436 138 590 696 426 1,063 1,500 1,412 1,050 1,620 1,460 3,560 , square miles; C, amount of soil consisting clay 2 No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No Yes Yes Yes Yes data flood Paleo- NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA peaks NDNR 17 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA peaks CDWR 11 23 34 20 21 25 22 33 32 50 45 53 33 13 42 33 37 23 27 19 19 28 28 73 32 26 13 31 23 68 56 52 33 32 75 12 39 23 69 USGS peaks degrees) (decimal Longitude –101.1116 –100.8111 –101.1169 –100.4903 –100.4450 –100.3228 –100.2575 –101.4660 –101.6329 –105.1914 –100.7221 –100.5343 –100.1790 –100.8724 –100.6732 –100.4274 –100.3176 –100.7010 –100.6296 –100.5240 –100.5315 –100.5365 –101.8667 –102.2427 –102.2521 –102.1774 –100.9590 –101.6269 –104.9975 –100.5601 –101.0457 –100.1007 –101.3479 –100.8699 –100.8585 –100.7032 –100.4882 –105.8600 –105.4836 39.3911 40.6347 40.6425 40.5006 40.4719 39.2853 39.3206 38.4364 39.6769 39.8131 39.9017 39.8147 40.3147 40.2361 40.1458 40.2342 40.2506 40.6028 40.5847 40.8264 40.7445 40.7275 40.0394 39.6164 39.5755 39.6972 40.1622 40.4317 40.3731 38.4892 39.9850 39.7697 39.0179 38.7889 38.7947 38.9417 38.9536 38.4672 38.1861 Latitude (decimal degrees) , mean basin 6-hour, 100-year precipitation; in., inches; S, mean basin slope; Wyo., Wyoming; Nebr., Nebraska; Colo., Colorado; Kans., Kansas; Nebr., Wyoming; Wyo., 100-year precipitation; in., inches; S, mean basin slope; , mean basin 6-hour, 100 P 6 Streamgage name , elevation of basin outlet; ft, feet; out E Fox Creek at Curtis, Nebr. Dry Creek near Curtis, Nebr. Medicine Creek above Harry Strunk Lake, Nebr. Mitchell Creek above Harry Strunk Lake, Nebr. Kans. South Fork Sappa Creek near Brewster, near Goodland, Kans. Tributary South Fork Sappa Creek Colo. Fourmile Creek near Canon City, South Fork Sappa Creek near Achilles, Kans. South Fork Sappa Creek near Sappa Creek near Oberlin, Kans. Kans. Long Branch draw near Norcatur, near Ludell, Kans. Tributary Beaver Creek Bobtail Creek near Palisade, Nebr. Blackwood Creek near Culbertson, Nebr. Driftwood Creek near McCook, Nebr. Coon Creek at Indianola, Nebr. Nebr. Dry Creek at Bartley, Elkhorn Canyon near Maywood, Nebr. Frazier Creek near Maywood, Nebr. Fox Creek north of Curtis, Nebr. Fox Creek above Cut Canyon near Curtis, Nebr. Cut Canyon near Curtis, Nebr. Buffalo Creek near Haigler, Nebr. Creek near Haigler, Buffalo South Fork Republican River near Idalia, Colo. Landsman Creek near Hale, Colo. Sand Creek near Hale, Colo. Thompson Canyon near Trenton, Nebr. Trenton, Thompson Canyon near Frenchman Creek near Imperial, Nebr. Stinking Water Creek near Palisade, Nebr. Water Stinking Beaver Creek above Highway 115 near Penrose, Colo. Beaver Creek above Highway 115 Beaver Creek at Cedar Bluffs, Kans. Beaver Creek at Cedar Bluffs, Kans. at Colby, Tributary Prairie Dog Creek Prairie Dog Creek above Keith Sebelius Lake, Kans. Kans. North Fork Smoky Hill River near McAllaster, Ladder Creek below Chalk Creek near Scott City, Kans. Ladder Creek below Chalk near Scott City, Kans. Smoky Hill River at Elkader, South Branch Hackberry Creek near Orion, Kans. Hackberry Creek near Gove, Kans. Badger Creek, Lower Station, near Howard, Colo. Colo. Westcliffe, Grape Creek near Summary of the streamgages used in regression analysis natural streams eastern Colorado, 2015.—Continued

USGS number streamgage 06840000 06840500 06841000 06841500 06844700 06844800 07096500 06844900 06845000 06845100 06846200 06846500 06835100 06836000 06836500 06838200 06838550 06839200 06839600 06839850 06839900 06839950 06823500 06825000 06825500 06826900 06829700 06831500 06835000 07099060 06847600 06847900 06858500 06859500 06860000 06860300 06860500 07093775 07095000 in basin; %, percent; Table 1. Table A, drainage area; mi Resources; NDNR, Nebraska Department of Natural Water [USGS, U.S. Geological Survey; CDWR, Colorado Division of Okla., Oklahoma; N. Mex., New Mexico; Tex., Texas; NA, not applicable] Texas; Tex., Okla., Oklahoma; N. Mex., New Mexico; 8 Paleoflood Investigations to Improve Peak-Streamflow Regional-Regression Equations, Eastern Colorado, 2015 S 6.14 2.07 4.81 4.43 2.83 2.14 2.01 7.49 3.86 7.92 6.09 6.40 4.59 (%) 11.7 11.6 35.3 26.8 20.8 10.0 13.4 31.8 25.4 28.0 28.4 32.1 13.3 16.2 48.6 48.7 48.2 24.0 18.5 44.5 39.5 30.9 48.2 37.5 43.1

100 P (in.) 6 3.37 3.34 3.42 3.82 3.79 3.69 3.72 3.83 3.28 3.63 3.78 3.71 3.15 3.94 3.99 3.53 3.35 3.89 4.12 3.78 3.62 3.92 3.97 3.97 3.82 3.66 3.49 4.22 3.78 4.00 3.94 3.97 4.02 3.98 3.91 3.89 3.34 3.84

out (ft) E 6,110 7,781 4,886 6,408 5,288 4,120 5,310 4,960 4,982 6,415 5,420 5,320 5,150 8,270 4,100 3,975 6,259 5,980 4,705 5,350 4,582 6,950 6,620 6,240 6,875 6,203 6,520 6,280 5,530 6,430 5,566 5,783 6,420 6,395 5,520 6,390 4,785 6,310 C (%) 9.87 11.0 11.1 11.6 20.1 23.9 24.3 26.0 24.9 22.9 23.3 25.5 19.6 27.3 28.9 25.6 17.2 25.9 21.6 36.8 30.5 22.4 22.8 24.9 16.1 14.9 13.7 12.6 34.5 21.9 27.9 21.4 22.5 22.4 21.8 22.8 23.6 14.1 ) 2 5.91 1.83 6.89 9.59 6.80 9.38 A 11.0 53.1 15.6 48.7 79.1 84.8 73.0 25.7 16.2 65.4 21.7 26.9 26.6 13.0 62.2 48.6 511 119 (mi 140 161 532 162 108 100 749 925 171 474 203 102 1,673 1,403 , square miles; C, amount of soil consisting clay 2 No No No No No No No No No No No No No No No No No No No No No No Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes data flood Paleo- NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA peaks NDNR 6 18 18 18 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA peaks CDWR 11 28 12 30 51 31 48 31 47 15 15 16 22 29 18 70 74 27 36 58 26 13 22 49 12 22 39 13 12 35 13 30 10 35 56 30 22 20 USGS peaks degrees) (decimal Longitude –104.1158 –104.2110 –104.6011 –104.4725 –104.6658 –104.0212 –103.6561 –103.9580 –103.9202 –105.0528 –104.1453 –104.0155 –105.0125 –103.3538 –104.6053 –104.5092 –104.7936 –104.4864 –105.3514 –103.5983 –104.7986 –104.7136 –104.8886 –104.8186 –104.8258 –104.8641 –104.6886 –104.8586 –104.7467 –104.8466 –104.9133 –104.8947 –104.8664 –104.8272 –104.8780 –103.8280 –104.8728 –104.8923 37.1147 38.9511 38.6117 38.0014 37.3864 37.5548 38.0031 37.3456 37.4242 37.4928 37.4200 37.1849 37.3045 37.3995 37.7272 38.0850 37.1709 37.1997 38.0517 38.2456 37.7278 37.9822 38.9761 38.8225 38.9178 38.9155 38.7905 38.6844 38.6817 38.6431 38.7075 38.4997 38.6272 38.4650 38.8547 38.2878 38.8769 39.1026 Latitude (decimal degrees) , mean basin 6-hour, 100-year precipitation; in., inches; S, mean basin slope; Wyo., Wyoming; Nebr., Nebraska; Colo., Colorado; Kans., Kansas; Nebr., Wyoming; Wyo., 100-year precipitation; in., inches; S, mean basin slope; , mean basin 6-hour, 100 P 6 Streamgage name , elevation of basin outlet; ft, feet; out E Springs, Colo. Colo. Huerfano River below Huerfano Valley Dam near Undercliffe, Colo. Undercliffe, near Dam Valley Huerfano below River Huerfano Apishapa River near Aguilar, Colo. Aguilar, Apishapa River near Colo. Thatcher, Arroyo near Big Timpas Creek at Mouth near Swink, Colo. Timpas Van Bremer Arroyo near Model, Colo. Bremer Van Taylor Arroyo below Rock Crossing, near Thatcher, Colo. Thatcher, Arroyo below Rock Crossing, near Taylor Lockwood Canyon Creek near Thatcher, Colo. Thatcher, Lockwood Canyon Creek near Cucharas River at Boyd Ranch near La Veta, Colo. Veta, Cucharas River at Boyd Ranch near La San Francisco Creek near Alfalfa, Colo. San Francisco Creek near Luning Arroyo near Model, Colo. Luning Colo. Tyrone, Arroyo near Bremer Van Huerfano River at Badito, Colo. Horse Creek near Las Animas, Colo. Horse Creek near Las Long Canyon Creek near Madrid, Colo. Purgatoire River at Trinidad, Colo. Trinidad, River at Purgatoire Alfalfa, Colo. Frijole Creek near St. Charles River at Burnt Mill, Colo. St. Charles River at Vineland, Colo. Vineland, St. Charles River at Huerfano River at Manzanares Crossing, near Redwing, Colo. Crooked Arroyo near Swink, Colo. Crooked Kettle Creek above U.S. Air Force Academy, Colo. Academy, Air Force Kettle Creek above U.S. Cottonwood Creek at Cowpoke Road Colorado Springs, Colo. Bear Creek near Colorado Springs, Colo. Monument Creek at Pikeview, Colo. Monument Creek at Pikeview, North Rockrimmon Creek above Delmonico Drive at Colorado at Colorado Springs, Colo. Avenue Cheyenne Creek at Evans Jimmy Camp Creek at Fountain, Colo. near Fort Carson, Little Fountain Creek above Keaton Reservoir, Little Fountain Creek near Fountain, Colo. Rock Creek above Fort Carson Reservation, Colo. Red Creek below Sullivan Park at Fort Carson, Colo. Creek near Fountain, Colo. Turkey Little Turkey Creek near Fountain, Colo. Turkey Little Turkey Creek above Teller Reservoir near Stone City, Colo. Reservoir near Stone City, Teller Creek above Turkey Fountain Creek near Colorado Springs, Colo. Fountain Creek at Pueblo, Colo. Camp Creek at Garden of the Gods, Colo. Monument Creek at Palmer Lake, Colo. Summary of the streamgages used in regression analysis natural streams eastern Colorado, 2015.—Continued

USGS number streamgage 07116000 07118000 07120620 07121500 07126200 07126325 07126390 07114000 07125500 07126100 07126140 07112500 07123675 07124300 07124500 07125100 07107500 07108900 07111000 07122400 07103960 07103977 07105000 07104000 07104050 07105490 07105900 07105920 07105940 07105945 07099080 07099215 07099220 07099230 07103700 07106500 07103703 07103747 in basin; %, percent; Table 1. Table A, drainage area; mi Resources; NDNR, Nebraska Department of Natural Water [USGS, U.S. Geological Survey; CDWR, Colorado Division of Okla., Oklahoma; N. Mex., New Mexico; Tex., Texas; NA, not applicable] Texas; Tex., Okla., Oklahoma; N. Mex., New Mexico; Methods for Data Development for Streamgages 9 S 8.93 5.05 2.57 1.86 5.38 0.58 0.81 0.91 2.08 6.27 1.57 1.51 1.71 1.92 1.14 2.03 1.62 3.57 1.16 1.36 0.48 1.14 1.57 8.55 4.12 (%) 11.8 11.1 11.2 12.3 23.6 23.4 16.3 10.4 13.5 24.7 13.5 13.2 26.3 19.5 26.9

100 P (in.) 6 3.77 4.82 4.33 5.07 4.99 4.65 4.59 4.58 4.78 5.36 5.60 3.62 3.94 5.02 3.88 4.88 3.84 3.88 3.33 4.68 4.97 4.97 3.64 4.58 4.87 4.45 4.50 4.55 5.01 5.10 4.10 4.44 4.29 3.98 4.30 3.98 3.26 2.98 3.13 5.48

out (ft) E 4,241 4,285 3,545 4,250 4,450 3,377 3,490 3,350 3,344 2,164 2,280 6,248 6,640 3,328 6,480 3,292 6,499 6,200 6,360 2,830 2,740 2,695 6,148 3,405 3,415 3,510 3,320 3,080 2,650 2,700 4,900 4,380 4,262 4,510 4,410 4,402 8,197 8,200 8,195 2,450 C (%) 25.2 22.5 21.4 28.7 19.6 26.7 24.9 21.4 28.4 20.2 37.5 32.6 19.7 31.4 27.0 30.6 33.3 35.0 23.8 22.0 29.6 32.6 23.9 21.6 26.0 24.1 26.5 33.7 28.6 21.7 20.2 21.0 16.7 18.1 19.9 20.5 23.9 29.1 24.1 30.3 ) 2 2.40 4.44 5.20 2.41 6.71 7.00 6.89 0.81 6.57 A 10.6 57.1 14.6 18.2 21.5 44.0 25.2 24.9 48.7 56.1 73.8 56.0 10.5 411 112 (mi 103 199 584 813 381 295 175 817 500 500 421 2,875 3,216 2,927 1,157 1,208 , square miles; C, amount of soil consisting clay 2 No No No No No No No No No No No No No No No No No No No No No No No No No No No Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes data flood Paleo- NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA peaks NDNR 17 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA peaks CDWR 11 34 18 18 36 41 33 21 15 15 22 40 54 31 32 12 33 10 85 12 49 33 72 10 39 20 21 33 21 33 61 63 22 31 16 29 71 72 76 33 USGS peaks degrees) (decimal Longitude –103.5111 –100.2113 –102.7405 –102.4838 –102.1385 –102.8049 –101.8979 –101.8988 –101.7736 –101.7754 –101.7616 –100.1226 –104.4622 –104.4361 –104.3333 –101.7616 –104.2640 –101.0504 –104.3964 –104.7864 –104.3767 –100.9271 –100.5546 –105.2680 –102.1391 –101.6216 –101.4882 –101.0629 –100.3504 –100.4154 –103.4241 –103.0183 –102.9591 –102.9016 –103.7255 –103.6322 –103.6483 –105.2654 –105.2752 –100.3399 38.1142 37.3113 38.4811 37.7242 38.0570 36.7722 37.1220 37.1909 37.2584 37.5015 36.8750 36.7872 36.9058 36.8308 37.6285 36.7842 37.3363 36.7703 36.6810 36.4498 37.2709 37.5653 36.5539 38.0278 38.5250 38.4800 38.0617 38.4828 36.9875 36.8833 36.9267 36.8978 37.5153 37.5439 37.5892 37.7147 36.4852 36.5185 37.2964 37.0325 Latitude (decimal degrees) , mean basin 6-hour, 100-year precipitation; in., inches; S, mean basin slope; Wyo., Wyoming; Nebr., Nebraska; Colo., Colorado; Kans., Kansas; Nebr., Wyoming; Wyo., 100-year precipitation; in., inches; S, mean basin slope; , mean basin 6-hour, 100 P 6 Streamgage name , elevation of basin outlet; ft, feet; out E Clay Creek Tributary near Deora, Colo. Tributary Clay Creek Big Sandy Creek near Lamar, Colo. Big Sandy Creek near Lamar, Wild Horse Creek above Holly, Colo. Horse Creek above Holly, Wild Cold Springs Creek near Wheeless, Okla. Cold Springs Creek near Cimarron River near Elkhart, Kans. near Elkhart, Kans. Tributary North Fork Cimarron River near Richfield, Kans. Tributary North Fork Cimarron River North Fork Cimarron River at Richfield, Kans. Arroyo Creek near Johnson, Kans. Sand Fork Creek near Knowles, Okla. West Canadian River near Hebron, N. Mex. Raton Creek at Raton, N. Mex. near Raton, N. Mex. Tributary Chicorica Creek Bear Creek near Johnson, Kans. Arroyo near Raton, N. Mex. Green Mountain Cimarron River Tributary near Moscow, Kans. near Moscow, Tributary Cimarron River Chicorica Creek near Hebron, N. Mex. River near Dawson, N. Mex. Vermejo Springs, N. Mex. Taylor near Tributary Rio Del Plano Cimarron River Tributary near Satanta, Kans. Tributary Cimarron River Crooked Creek near Copeland, Kans. Moreno Creek at Eagle Nest, N. Mex. Two Butte Creek near Holly, Colo. Butte Creek near Holly, Two White Woman Creek Tributary near Selkirk, Kans. Tributary Creek Woman White White Woman Creek near Leoti, Kans. Woman White Lion Creek Tributary near Modoc, Kans. Tributary Lion Creek near Kalvesta, Kans. Tributary Pawnee River near Dighton, Kans. Tributary Creek Walnut South Fork N. Mex. Dry Cimarron River near Guy, Carrizozo Creek near Kenton, Okla. Cimarron River near Kenton, Okla. Creek near Kenton, Okla. Tesesquite Red Rock Canyon Creek at Mouth near Thatcher, Colo. Thatcher, Red Rock Canyon Creek at Mouth near Chacuaco Creek at Mouth near Timpas, Colo. Timpas, Chacuaco Creek at Mouth near Colo. Timpas, Bent Canyon Creek at Mouth near Purgatoire River at Ninemile Dam, near Higbee, Colo. Purgatoire Cieneguilla Creek near Eagle Nest, N. Mex. Sixmile Creek near Eagle Nest, N. Mex. Crooked Creek Tributary at Meade, Kans. Tributary Crooked Creek Crooked Creek near Englewood, Kans. Summary of the streamgages used in regression analysis natural streams eastern Colorado, 2015.—Continued

USGS number streamgage 07133200 07134100 07134990 07155100 07155590 07155900 07156000 07156010 07156100 07157550 07199000 07201000 07201200 07156220 07201450 07156600 07202000 07203000 07203600 07156700 07157100 07157400 07204000 07135000 07138600 07138650 07138800 07140600 07141400 07153500 07154400 07154500 07154650 07126415 07126470 07126480 07126500 07204500 07205000 07157500 in basin; %, percent; Table 1. Table A, drainage area; mi Resources; NDNR, Nebraska Department of Natural Water [USGS, U.S. Geological Survey; CDWR, Colorado Division of Okla., Oklahoma; N. Mex., New Mexico; Tex., Texas; NA, not applicable] Texas; Tex., Okla., Oklahoma; N. Mex., New Mexico; 10 Paleoflood Investigations to Improve Peak-Streamflow Regional-Regression Equations, Eastern Colorado, 2015 S 5.52 5.92 5.93 6.00 7.64 4.04 6.12 6.16 5.34 5.34 2.01 2.36 5.67 2.88 0.67 0.40 1.96 2.55 3.42 1.09 1.52 1.11 (%) 11.1 28.0 24.1 13.6 17.0 48.1 27.3 24.1 15.4 33.5

100 P (in.) 6 4.52 4.82 4.41 3.77 3.94 3.64 3.85 3.96 3.75 4.02 4.41 4.07 4.27 4.17 3.27 3.30 3.46 3.49 3.95 4.13 4.55 4.53 4.90 4.57 4.70 5.36 5.19 5.17 5.33 4.86 4.78 4.75

out (ft) E 5,110 3,660 3,920 4,481 6,240 6,910 6,300 4,605 4,580 4,430 4,290 4,100 5,800 4,540 3,820 7,860 6,630 6,720 5,640 5,908 7,635 4,800 2,836 2,971 3,120 2,760 2,770 2,541 2,230 4,410 2,871 2,962 C (%) 30.4 25.9 25.6 35.9 32.4 30.1 23.7 23.2 27.0 23.1 21.6 26.5 26.7 24.1 25.7 20.7 33.4 29.1 33.5 31.7 25.3 27.8 26.2 26.8 38.5 24.0 30.9 32.2 18.6 29.7 29.9 35.4 ) 2 1.20 1.16 7.44 4.20 0.26 1.00 4.30 A 25.0 54.7 18.4 63.9 12.0 15.2 34.0 60.1 23.0 42.0 33.9 (mi 556 132 523 269 786 171 134 170 297 625 2,060 2,850 2,033 1,903 , square miles; C, amount of soil consisting clay 2 No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No Yes Yes data flood Paleo- NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA peaks NDNR 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA peaks CDWR 0 23 47 43 57 24 52 60 39 40 12 34 72 54 48 62 91 73 13 14 17 18 15 57 22 12 12 22 24 52 30 49 USGS peaks degrees) (decimal Longitude –103.1022 –103.2033 –103.3186 –104.8881 –104.4156 –104.4167 –104.4436 –104.3639 –103.7928 –103.9255 –103.6856 –103.5258 –103.3896 –105.1750 –104.9468 –104.9693 –104.4955 –104.2636 –105.3892 –105.2520 –103.1842 –101.3510 –101.4896 –101.4988 –102.7866 –100.9129 –100.6643 –100.5024 –100.1210 –104.5214 –101.3815 –101.3060 35.0590 36.0708 36.3889 35.8261 35.6386 35.4672 35.4028 35.3358 35.1419 36.3059 35.9797 35.4385 35.3444 36.5264 36.5737 36.3723 36.2976 36.1667 35.9742 35.7698 36.3422 35.6648 36.7214 36.6684 36.5540 36.8639 36.6170 36.6450 35.4731 37.1306 36.5720 36.2023 Latitude (decimal degrees) , mean basin 6-hour, 100-year precipitation; in., inches; S, mean basin slope; Wyo., Wyoming; Nebr., Nebraska; Colo., Colorado; Kans., Kansas; Nebr., Wyoming; Wyo., 100-year precipitation; in., inches; S, mean basin slope; , mean basin 6-hour, 100 P 6 Streamgage name , elevation of basin outlet; ft, feet; out E Arroyo Del Puerto near Endee, N. Mex. Creek near Stead, N. Mex. Tramperos near Clayton, N. Mex. Tributary Arroyo Sandy Dog Creek near Shoemaker, N. Mex. Dog Creek near Shoemaker, near Sanchez, N. Mex. Tributary Lagartija Creek N. Mex. Trementina, Creek at Trementina N. Mex. Variadero, Conchas River at N. Mex. Variadero, near Tributary Garita Creek N. Mex. Tucumcari, Bluewater Creek near Ute Creek near Gladstone, N. Mex. Bueyeros Creek at Bueyeros, N. Mex. Ute Creek near Logan, N. Mex. Revuelto Creek near Logan, N. Mex. Clear Creek near Ute Park, N. Mex. Ponil Creek near Cimarron, N. Mex. Rayado Creek near Cimarron, N. Mex. Springs, N. Mex. Taylor Canadian River near near Mills, N. Mex. Tributary Canadian River Rio La Casa near Cleveland, N. Mex. Sapello River at Sapello, N. Mex. Sand Draw near Clayton, N. Mex. Dixon Creek near Borger, Tex. Dixon Creek near Borger, Beaver River near Guymon, Okla. near Guymon, Okla. Tributary South Fork Aqua Frio Creek near Felt, Okla. Okla. Turpin, near Tributary Sharp Creek near Balko, Okla. Tributary North Fork Clear Creek Clear Creek near Elmwood, Okla. Tex. Sweetwater Creek near Kelton, Raton Creek above Starkville, Colo. Coldwater Creek near Guymon, Okla. Tex. Palo Duro Creek near Spearman, Summary of the streamgages used in regression analysis natural streams eastern Colorado, 2015.—Continued

USGS number streamgage 07227150 07227200 07227295 07220900 07221600 07222300 07222500 07222800 07225300 07225500 07226200 07226500 07227100 07206400 07207500 07208500 07211500 07213700 07214800 07220000 07227300 07227920 07232500 07232550 07232650 07234050 07234100 07301410 NA 07232900 07233500 07233850 in basin; %, percent; Table 1. Table A, drainage area; mi Resources; NDNR, Nebraska Department of Natural Water [USGS, U.S. Geological Survey; CDWR, Colorado Division of Okla., Oklahoma; N. Mex., New Mexico; Tex., Texas; NA, not applicable] Texas; Tex., Okla., Oklahoma; N. Mex., New Mexico; Regional-Regression Analyses 31

64 69 80 60 93 41 82 65 57 10 35 37 78 48 86 70 82 77 98 39 61 0.002 118 264 317 144 195 164 799 128 363 247 142 106 268 100 601 318 125 231 126 171 198 Q 2043 2,596 1,253 1,574 1,016 length record effective

64 69 80 50 96 40 83 69 50 10 34 97 35 77 47 85 70 83 0.005 71 94 38 61 118 110 225 191 972 134 204 565 888 148 356 125 692 587 197 266 131 105 181 447 189 189 124 149 199 Q length record effective

; NA, not applicable]

0.01 69 81 41 96 38 79 71 44 10 97 33 92 33 76 44 82 69 83 64 87 38 61 99 62 111 118 119 115 116 Q 180 447 181 281 548 130 185 334 321 133 234 130 274 132 106 141 126 172 length record effective

0.02 11 69 68 97 81 31 89 35 95 64 97 71 91 35 83 81 92 32 85 31 92 72 89 40 75 66 80 52 77 92 37 98 59 83 60 Q 130 210 126 138 328 107 169 164 156 145 100 122 length record effective

0.04 11 40 67 72 70 81 70 22 73 30 82 50 45 72 66 89 83 61 82 27 54 60 66 30 74 28 72 63 65 69 35 64 59 71 39 63 54 35 78 71 55 64 72 85 55 Q 103 194 length record effective

0.1 11 20 65 47 44 29 81 32 14 45 22 54 23 23 42 47 43 37 36 31 18 28 35 43 27 58 24 31 40 51 45 28 47 45 52 24 44 26 33 49 44 46 42 32 48 46 Q 105 length record effective

0.2 11 11 15 64 33 34 17 81 22 30 19 43 79 16 29 15 32 32 25 27 18 14 19 24 34 25 50 22 20 31 41 35 24 37 36 40 17 36 17 31 35 34 39 32 19 36 39 Q length record effective

0.5 11 11 13 64 31 30 12 80 19 22 18 10 39 77 13 23 21 31 20 24 12 13 16 19 30 25 48 22 16 27 37 31 22 32 31 32 13 34 13 31 28 31 34 29 13 33 34 Q length record effective

1 1 1 1 1 1 1 1 1 1 1 2 1 1 2 1 1 1 1 2 2 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 2 1 1 2 1 1 1 1 1 1 2 peaks Number of paleoflood

0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 peaks historic Number of 11 62 30 10 81 18 23 18 10 39 74 12 22 10 13 30 20 23 10 13 15 17 30 25 48 22 15 26 36 31 22 32 31 30 12 33 13 31 27 31 33 29 30 12 33 33 12 peaks Number of systematic

logic region Hydro - Foothills Foothills Plains Plains Plains Foothills Foothills Foothills Plains Foothills Plains Foothills Foothills Foothills Foothills Plains NA Foothills Foothills Foothills Plains NA Foothills Foothills Plains Foothills Plains NA Plains Plains Foothills Plains Plains Plains Foothills Plains Plains Plains Foothills Foothills Plains Plains Foothills Foothills Plains Plains Foothills , discharge with an annual exceedance-probability of 0.5, 0.2, 0.1, 0.04, 0.02, 0.01, 0.005, 0.002, respectively with an annual exceedance-probability of 0.5, 0.2, 0.1, 0.04, 0.02, 0.01, 0.005, , discharge 0.002 , Q 0.005 , Q 0.01 , Q 0.02 , Q 0.04 . , Q 0.1 , Q 0.2 Streamgage name , Q 0.5 Turkey Creek near Fountain, Colo. Turkey Colo. Butte Creek near Holly, Two Blue Creek near Lewellen, Nebr Sand Draw near Clayton, N. Mex. Crow Creek at 19th Street, at Cheyenne, Wyo. Crow Creek at 19th Street, Cheyenne, Long Canyon Creek near Madrid, Colo. Little Turkey Creek near Fountain, Colo. Turkey Little near Selkirk, Kans. Tributary Creek Woman White Cherry Creek near Franktown, Colo. Aqua Frio Creek near Felt, Okla. Camp Creek at Garden of the Gods, Colo. Kiowa Creek at Kiowa, Colo. Alfalfa, Colo. Frijole Creek near Cherry Creek near Melvin, Colo. White Woman Creek near Leoti, Kans. Woman White NA Middle Bijou Creek Tributary near Deer Trail, Colo. Trail, near Deer Tributary Middle Bijou Creek Colo. Academy, Air Force Kettle Creek above U.S. San Francisco Creek near Alfalfa, Colo. San Francisco Creek near Clear Creek near Golden, Colo. Cold Springs Creek near Wheeless, Okla. Cold Springs Creek near NA Lodgepole Creek Tributary Number 2 near Albin, Wyo. Albin, Number 2 near Tributary Lodgepole Creek Cottonwood Creek at Cowpoke Road Colorado Springs, Colo. Van Bremer Arroyo near Model, Colo. Bremer Van Bear Creek near Colorado Springs, Colo. Sand Arroyo Creek near Johnson, Kans. Sand NA Lodgepole Creek at Ralton, Nebr. Taylor Arroyo below Rock Crossing, near Thatcher, Colo. Thatcher, Arroyo below Rock Crossing, near Taylor Cheyenne Creek at Evans Avenue at Colorado Springs, Colo. Avenue Cheyenne Creek at Evans Bear Creek near Johnson, Kans. Frenchman Creek near Imperial, Nebr. Lockwood Canyon Creek near Thatcher, Colo. Thatcher, Lockwood Canyon Creek near Little Fountain Creek near Fountain, Colo. Cimarron River Tributary near Moscow, Kans. near Moscow, Tributary Cimarron River Bobtail Creek near Palisade, Nebr. Red Rock Canyon Creek at Mouth near Thatcher, Colo. Thatcher, Red Rock Canyon Creek at Mouth near St. Charles River at Burnt Mill, Colo. Chicorica Creek Tributary near Raton, N. Mex. Tributary Chicorica Creek South Fork Sappa Creek Tributary near Goodland, Kans. Tributary South Fork Sappa Creek Bent Canyon Creek at Mouth near Timpas, Colo. Timpas, Bent Canyon Creek at Mouth near Big Arroyo near Thatcher, Colo. Thatcher, Arroyo near Big Green Mountain Arroyo near Raton, N. Mex. Green Mountain North Fork Smoky Hill River near McAllaster, Kans. North Fork Smoky Hill River near McAllaster, Big Sandy Creek near Lamar, Colo. Big Sandy Creek near Lamar, Rio Del Plano Tributary near Taylor Springs, N. Mex. Taylor near Tributary Rio Del Plano

Number of years record at the 44 streamgages where paleoflood data were collected.

USGS numbe r streamgage 07099215 07135000 06687000 07227300 06755960 07124300 07099220 07138600 06712000 07232650 07103703 06758200 07125100 06712500 07138650 Foothills mean 06758700 07103960 07125500 06719500 07155100 Plains mean 06762600 07103977 07126200 07105000 07156100 Mean 06763500 07126325 07105490 07156220 06831500 07126390 07105940 07156600 06835100 07126415 07107500 07201200 06844800 07126480 07120620 07201450 06858500 07134100 07203600 Table 5. Table [USGS, U.S. Geological Survey; Q Appendixes 51

Appendix 2. Paleoflood Data

Table 2–1. Summary of the paleoflood data collected and applied at 44 streamgages used in the regression analysis of natural streams in eastern Colorado, 2015.

[USGS, U.S. Geological Survey; Q, discharge; Qlow, low uncertainty discharge; Qhigh, high uncertainty discharge; HEC-RAS, Hydrologic Engineering Center River Analysis System; SAC, Slope-Area Computation, Nebr., Nebraska; Colo., Colorado; Wyo., Wyoming; Kans., Kansas; Do., repeat from row above; Okla., Oklahoma; NA, not applicable; N. Mex., New Mexico]

Annual exceedance- probability discharge USGS Age, Age (percent) stream- Date Data in years uncer- Streamgage name Q Q Q Method gage collected type low high from date tainty, (in cubic (in cubic (in cubic number collected in years feet per feet per feet per second) second) second) 06687000 Blue Creek near Lewellen, Nebr. 2014 Non-exceedance 3,970 2,860 18,700 350 ±150 HEC-RAS bound 06712000 Cherry Creek near Franktown, Colo. 1999 Paleoflood 37,000 27,800 46,300 7,500 ±2,500 Critical depth 06712500 Cherry Creek near Melvin, Colo. 1999 Paleoflood 74,000 55,500 92,500 3,200 ±1,600 Slope conveyance 06719500 Clear Creek near Golden, Colo. 2002 Paleoflood 50,100 37,600 62,600 6,000 Unknown Flow competence 06755960 Crow Creek at 19th Street, at 2014 Non-exceedance 11,000 7,140 22,700 125 ±25 HEC-RAS Cheyenne, Wyo. bound 06758200 Kiowa Creek at Kiowa, Colo. 2014 Non-exceedance 19,700 19,700 19,700 49 0 Gage record bound 06758700 Middle Bijou Creek Tributary near 2014 Paleoflood 1,820 1,290 4,540 150 ±50 SAC Deer Trail, Colo. 06762600 Lodgepole Creek Tributary Number 2 2014 Non-exceedance 4,500 4,500 25,300 200 ±100 HEC-RAS near Albin, Wyo. bound 06763500 Lodgepole Creek at Ralton, Nebr. 2014 Non-exceedance 18,500 13,400 48,600 300 ±200 HEC-RAS bound 06831500 Frenchman Creek near Imperial, Nebr. 2014 Non-exceedance 4,000 3,150 21,900 200 ±100 HEC-RAS bound 06835100 Bobtail Creek near Palisade, Nebr. 2014 Non-exceedance 15,200 15,200 105,000 350 ±150 HEC-RAS bound 06844800 South Fork Sappa Creek Tributary near 2014 Non-exceedance 3,450 3,450 3,450 57 0 Gage record Goodland, Kans. bound 06858500 North Fork Smoky Hill River near 2014 Non-exceedance 50,000 32,700 129,000 300 ±200 HEC-RAS McAllaster, Kans. bound 07099215 Turkey Creek near Fountain, Colo. 2014 Non-exceedance 1,650 1,560 2,480 150 ±50 SAC bound 07099220 Little Turkey Creek near Fountain, Colo. 2014 Non-exceedance 1,230 1,010 1,400 150 ±50 SAC bound 07103703 Camp Creek at Garden of the Gods, Colo. 2014 Non-exceedance 875 714 1,360 150 ±50 SAC bound 07103960 Kettle Creek above U.S. Air Force 2014 Paleoflood 12,800 12,800 13,000 49 0 HEC-RAS Academy, Colo. Do. 2014 Non-exceedance 12,800 12,800 24,400 150 ±50 HEC-RAS bound 07103977 Cottonwood Creek at Cowpoke Road at 2014 Non-exceedance 6,100 5,500 9,630 300 ±200 HEC-RAS Colorado Springs, Colo. bound 07105000 Bear Creek near Colorado Springs, Colo. 2014 Non-exceedance 1,600 918 8,810 300 ±200 SAC bound Do. 2014 Non-exceedance 4,060 3,000 13,700 750 ±250 SAC bound 07105490 Cheyenne Creek at Evans Avenue at 2014 Non-exceedance 3,000 2,700 6,800 125 ±75 HEC-RAS Colorado Springs, Colo. bound 07105940 Little Fountain Creek near Fountain, 2014 Non-exceedance 18,000 7,140 41,600 150 ±50 SAC Colo. bound 07107500 St. Charles River at Burnt Mill, Colo. 2014 Non-exceedance 21,800 21,800 21,800 91 0 Gage record bound Do. 2014 Non-exceedance 24,500 21,800 45,400 150 ±50 HEC-RAS bound 52 Paleoflood Investigations to Improve Peak-Streamflow Regional-Regression Equations, Eastern Colorado, 2015

Table 2–1. Summary of the paleoflood data collected and applied at 44 streamgages used in the regression analysis of natural streams in eastern Colorado, 2015.—Continued

3 [USGS, U.S. Geological Survey; Q, discharge; Qlow, low uncertainty discharge; Qhigh, high uncertainty discharge; ft /s, cubic foot per second; HEC-RAS, Hydrologic Engineering Center River Analysis System; SAC, Slope-Area Computation, Nebr., Nebraska; Colo., Colorado; Wyo., Wyoming; Kans., Kansas; Do., repeat from row above; Okla., Oklahoma; NA, not applicable; N. Mex., New Mexico] Annual exceedance- probability discharge USGS Age, Age (percent) stream- Date Data in years uncer- Streamgage name Q Q Q Method gage collected type low high from date tainty, (in cubic (in cubic (in cubic number collected in years feet per feet per feet per second) second) second) 07120620 Big Arroyo near Thatcher, Colo. 2014 Non-exceedance 5,120 4,260 15,600 750 ±250 HEC-RAS bound 07124300 Long Canyon Creek near Madrid, Colo. 2014 Non-exceedance 13,000 9,500 36,200 200 ±100 HEC-RAS bound 07125100 Frijole Creek near Alfalfa, Colo. 2014 Non-exceedance 28,400 28,400 62,000 200 ±100 HEC-RAS bound Do. 2014 Paleoflood 6,540 5,420 7,660 32 0 HEC-RAS 07125500 San Francisco Creek near Alfalfa, Colo. 2014 Non-exceedance 26,300 26,300 26,300 60 0 Gage record bound Do. 2014 Non-exceedance 26,300 26,300 55,500 2,000 ±1,000 HEC-RAS bound 07126200 Van Bremer Arroyo near Model, Colo. 2014 Non-exceedance 29,500 21,300 46,600 150 ±50 HEC-RAS bound 07126325 Taylor Arroyo below Rock Crossing, 2014 Non-exceedance 9,090 7,650 20,100 150 ±50 HEC-RAS near Thatcher, Colo. bound 07126390 Lockwood Canyon Creek near 2014 Non-exceedance 1,110 1,110 1,110 75 ±25 Gage record Thatcher, Colo. bound 07126415 Red Rock Canyon Creek at Mouth near 2014 Non-exceedance 21,200 15,700 45,300 150 ±50 HEC-RAS Thatcher, Colo. bound 07126480 Bent Canyon Creek at Mouth near 2014 Non-exceedance 7,530 5,470 25,000 150 ±50 SAC Timpas, Colo. bound 07134100 Big Sandy Creek near Lamar, Colo. 2014 Non-exceedance 3,600 3,600 3,600 80 ±10 Gage record bound 07135000 Two Butte Creek near Holly, Colo. 2014 Non-exceedance 2,820 2,090 10,100 70 ±10 SAC bound 07138600 White Woman Creek Tributary near 2014 Non-exceedance 1,870 1,440 4,790 500 ±100 SAC Selkirk, Kans. bound 07138650 White Woman Creek near Leoti, Kans. 2014 Non-exceedance 8,300 5,800 20,700 300 ±100 SAC bound 07155100 Cold Springs Creek near Wheeless, Okla. 2014 Non-exceedance 2,520 2,520 2,520 75 0 Gage record bound 07156100 Sand Arroyo Creek near Johnson, Kans. 2014 Non-exceedance 2,300 2,300 2,300 300 ±100 Gage record bound 07156220 Bear Creek near Johnson, Kans. 2014 Non-exceedance 15,000 15,000 15,000 100 ±10 Gage record bound 07156600 Cimarron River Tributary near 2014 Non-exceedance 3,900 3,900 3,900 24 0 Gage record Moscow, Kans. bound Do. 2014 Non-exceedance 9,620 7,100 NA 2,000 ±1,000 SAC bound 07201200 Chicorica Creek Tributary near Raton, 2014 Non-exceedance 3,500 2,580 9,800 350 ±150 SAC N. Mex. bound 07201450 Green Mountain Arroyo near Raton, N. 2014 Paleoflood 15,000 10,200 28,100 100 ±40 SAC Mex. 07203600 Rio Del Plano Tributary near Taylor 2014 Non-exceedance 2,820 1,820 5,600 500 ±100 r Springs, N. Mex. bound Do. 2014 Indirect- 938 938 938 0 0 SAC discharge measurement 07227300 Sand Draw near Clayton, N. Mex. 2014 Non-exceedance 12,200 8,730 42,100 500 ±100 SAC bound 07232650 Aqua Frio Creek near Felt, Okla. 2014 Non-exceedance 1,900 1,900 1,900 38 0 Gage record bound Do. 2014 Non-exceedance 6,540 5,600 11,200 2,000 ±500 Step- bound rackwater Mean 630 years Appendixes 53

Appendix 3. Annual Exceedance-Probability Discharges

Table 3–1. Summary of the annual exceedance-probability discharges at the 188 streamgages used in the regression analysis of natural streams in eastern Colorado, 2015.

[USGS, U.S. Geological Survey; Q0.5, Q0.2, Q0.1, Q0.04, Q0.02, Q0.01, Q0.005, Q0.002, discharge with an annual exceedance-probability of 0.5, 0.2, 0.1, 0.04, 0.02, 0.01, 0.005, 0.002, respectively; Wyo., Wyoming; Nebr., Nebraska; Colo., Colorado; Kans., Kansas; Okla., Oklahoma; N. Mex., New Mexico; Tex., Texas; NA, not applicable] Annual exceedance-probability discharge, Streamgage information in cubic feet per second USGS

streamgage Streamgage name Q2 Q5 Q10 Q25 Q50 Q100 Q200 Q500 number 06655000 Cottonwood Creek at Wendover, Wyo. 284 926 1,750 3,520 5,560 8,450 12,400 20,000 06668040 Rabbit Creek near Wheatland, Wyo. 26.7 72.9 122 211 300 410 545 768 06675300 Horse Creek Tributary near Little Bear, Wyo. 13.8 55.8 110 220 337 488 678 996 06687000 Blue Creek near Lewellen, Nebr. 194 285 359 467 562 668 789 973 06707000 North Fork South Platte River at South 836 1,290 1,600 1,980 2,260 2,530 2,800 3,150 Platte, Colo. 06708500 Deer Creek near Littleton, Colo. 63.5 142 213 328 432 551 688 897 06709500 Plum Creek near Louviers, Colo. 495 1,810 3,870 9,310 17,000 30,000 51,500 102,000 06710385 Bear Creek above Evergreen, Colo. 204 341 457 639 801 990 1,210 1,550 06710990 Parmalee Gulch at Mouth, at Indian Hills, Colo. 18.8 52.4 87.9 150 211 286 374 518 06711000 Turkey Creek near Morrison, Colo. 124 357 625 1,140 1,680 2,400 3,310 4,910 06712000 Cherry Creek near Franktown, Colo. 627 1,710 2,840 4,800 6,680 8,950 11,700 15,900 06712500 Cherry Creek near Melvin, Colo. 2,180 5,610 8,920 14,300 19,100 24,700 30,900 40,300 06718550 North Clear Creek above Mouth near 162 309 431 614 769 940 1,130 1,410 Black Hawk, Colo. 06719500 Clear Creek near Golden, Colo. 1,690 2,960 3,930 5,300 6,420 7,610 8,890 10,700 06724000 Saint Vrain Creek at Lyons, Colo. 1,010 1,850 2,670 4,120 5,570 7,430 9,790 13,900 06724500 Left Hand Creek near Boulder, Colo. 355 555 702 903 1,060 1,230 1,410 1,660 06726900 Bummers Gulch near El Vado, Colo. 3.80 8.10 12.2 19.3 26.0 34.4 44.5 61.3 06727500 Fourmile Creek at Orodell, Colo. 82.7 226 386 685 997 1,400 1,910 2,800 06730300 Coal Creek near Plainview, Colo. 51.1 146 250 435 619 846 1,120 1,570 06730500 Boulder Creek at Mouth near Longmont, Colo. 725 1,450 2,100 3,140 4,090 5,190 6,470 8,480 06736000 North Fork Big Thompson River at Drake, Colo. 213 469 739 1,240 1,760 2,450 3,340 4,940 06736650 Cedar Creek at Cedar Cove, Colo. 36.6 174 397 962 1,710 2,870 4,630 8,270 06739500 Buckhorn Creek near Masonville, Colo. 326 1,650 3,750 8,880 15,400 25,000 38,800 65,900 06742000 Little Thompson River near Berthoud, Colo. 508 1,680 3,130 6,080 9,360 13,800 19,600 30,200 06751490 North Fork Cache La Poudre River at 400 1,070 1,770 3,010 4,240 5,750 7,590 10,600 Livermore, Colo. 06755000 South Crow Creek near Hecla, Wyo. 16.7 36.5 56.1 90.0 123 165 215 300 06755960 Crow Creek at 19th Street, at Cheyenne, Wyo. 205 596 1,050 1,940 2,880 4,140 5,780 8,670 06758200 Kiowa Creek at Kiowa, Colo. 522 2,400 5,180 11,500 19,100 30,000 44,900 72,700 06758700 Middle Bijou Creek Tributary near Deer Trail, 270 526 733 1,030 1,280 1,540 1,830 2,230 Colo. 06759100 Bijou Creek near Fort Morgan, Colo. 175 384 597 978 1,360 1,860 2,480 3,560 06761900 Lodgepole Creek Tributary near Pine Bluffs, Wyo. 29.4 60.7 89.2 135 177 226 283 372 06762500 Lodgepole Creek at Bushnell, Nebr. 120 760 1,960 5,320 10,100 17,800 29,800 55,500 06762600 Lodgepole Creek Tributary Number 2 near 98.0 232 362 581 787 1,030 1,330 1,790 Albin, Wyo. 06763500 Lodgepole Creek at Ralton, Nebr. 42.5 161 350 847 1,550 2,730 4,680 9,200 06767200 North Fork Plum Creek Tributary near 18.6 71.8 146 314 517 809 1,220 2,010 Farnam, Nebr. 06821300 North Fork Arikaree Tributary near Shaw, Colo. 128 401 717 1,310 1,930 2,720 3,710 5,370 06821400 North Fork Black Wolf Creek near Vernon, Colo. 128 824 2,080 5,400 9,800 16,600 26,500 46,200 06821500 Arikaree River at Haigler, Nebr. 666 3,600 8,250 19,200 32,400 51,200 76,900 124,000 06823000 North Fork Republican River at Colorado- 175 403 653 1,130 1,650 2,350 3,290 5,010 Nebraska State Line 06823500 Buffalo Creek near Haigler, Nebr. 22.4 39.4 54.4 78.5 101 127 158 208 06825000 South Fork Republican River near Idalia, Colo. 3,460 8,620 14,300 25,100 36,600 51,700 71,600 107,000 06825500 Landsman Creek near Hale, Colo. 1,280 3,640 6,110 10,400 14,500 19,500 25,300 34,600 06826900 Sand Creek near Hale, Colo. 55.4 393 1,070 3,090 6,060 11,100 19,100 36,800 06829700 Thompson Canyon near Trenton, Nebr. 267 700 1,180 2,070 2,990 4,190 5,720 8,390 06831500 Frenchman Creek near Imperial, Nebr. 298 602 893 1,390 1,870 2,450 3,170 4,370 06835000 Stinking Water Creek near Palisade, Nebr. 385 869 1,370 2,300 3,240 4,460 6,020 8,760 06835100 Bobtail Creek near Palisade, Nebr. 316 924 1,660 3,140 4,790 7,050 10,100 15,700 54 Paleoflood Investigations to Improve Peak-Streamflow Regional-Regression Equations, Eastern Colorado, 2015

Table 3–1. Summary of the annual exceedance-probability discharges at the 188 streamgages used in the regression analysis of natural streams in eastern Colorado, 2015.—Continued

Annual exceedance-probability discharge, Streamgage information in cubic feet per second USGS

streamgage Streamgage name Q2 Q5 Q10 Q25 Q50 Q100 Q200 Q500 number 06836000 Blackwood Creek near Culbertson, Nebr. 388 940 1,490 2,430 3,330 4,420 5,720 7,820 06836500 Driftwood Creek near McCook, Nebr. 781 1,890 3,030 5,060 7,070 9,580 12,700 17,900 06838200 Coon Creek at Indianola, Nebr. 129 299 464 743 1,010 1,330 1,710 2,320 06838550 Dry Creek at Bartley, Nebr. 249 388 496 652 782 925 1,080 1,320 06839200 Elkhorn Canyon near Maywood, Nebr. 182 642 1,280 2,750 4,570 7,270 11,200 19,100 06839600 Frazier Creek near Maywood, Nebr. 660 2,250 4,500 9,820 16,600 27,100 43,000 76,400 06839850 Fox Creek north of Curtis, Nebr. 98.5 628 1,680 4,880 9,790 18,400 32,900 66,800 06839900 Fox Creek above Cut Canyon near Curtis, Nebr. 247 714 1,260 2,350 3,520 5,100 7,170 10,900 06839950 Cut Canyon near Curtis, Nebr. 321 648 951 1,450 1,910 2,460 3,110 4,160 06840000 Fox Creek at Curtis, Nebr. 434 1,070 1,730 2,880 4,010 5,400 7,100 9,900 06840500 Dry Creek near Curtis, Nebr. 798 2,620 5,220 11,500 19,600 32,400 52,300 95,100 06841000 Medicine Creek above Harry Strunk Lake, Nebr. 2,710 6,190 9,690 15,800 21,800 29,300 38,600 54,000 06841500 Mitchell Creek above Harry Strunk Lake, Nebr. 509 1,670 3,070 5,840 8,800 12,700 17,700 26,500 06844700 South Fork Sappa Creek near Brewster, Kans. 123 344 594 1,070 1,560 2,200 3,020 4,450 06844800 South Fork Sappa Creek Tributary near 39.3 333 945 2,720 5,240 9,250 15,300 27,700 Goodland, Kans. 06844900 South Fork Sappa Creek near Achilles, Kans. 282 1,060 2,060 4,140 6,450 9,540 13,600 20,700 06845000 Sappa Creek near Oberlin, Kans. 467 1,990 4,090 8,540 13,500 20,200 28,900 44,200 06845100 Long Branch draw near Norcatur, Kans. 234 596 961 1,580 2,170 2,880 3,720 5,040 06846200 Beaver Creek Tributary near Ludell, Kans. 325 610 835 1,160 1,420 1,690 1,990 2,410 06846500 Beaver Creek at Cedar Bluffs, Kans. 286 837 1,490 2,790 4,210 6,130 8,670 13,300 06847600 Prairie Dog Creek Tributary at Colby, Kans. 163 410 669 1,140 1,610 2,190 2,930 4,160 06847900 Prairie Dog Creek above Keith Sebelius 414 1,570 3,270 7,310 12,500 20,400 32,300 56,800 Lake, Kans. 06858500 North Fork Smoky Hill River near 283 1,540 3,540 8,310 14,100 22,500 34,100 55,700 McAllaster, Kans. 06859500 Ladder Creek beowl Chalk Creek nrea 733 3,280 7,170 16,500 28,300 45,900 71,400 122,000 Scott City, Kans. 06860000 Smoky Hill River at Elkader, Kans. 1,170 5,270 10,900 22,600 35,400 52,100 73,200 109,000 06860300 South Branch Hackberry Creek near Orion, Kans. 358 1,170 2,190 4,340 6,780 10,200 14,800 23,400 06860500 Hackberry Creek near Gove, Kans. 421 2,150 4,820 11,000 18,400 28,800 43,000 69,000 07093775 Badger Creek, Lower Station, near Howard, Colo. 255 935 1,800 3,560 5,470 7,990 11,300 16,900 07095000 Grape Creek near Westcliffe, Colo. 378 807 1,190 1,780 2,310 2,910 3,590 4,610 07096500 Fourmile Creek near Canon City, Colo. 525 1,260 2,000 3,300 4,570 6,130 8,030 11,200 07099060 Beaver Creek above Highway 115 near 170 644 1,280 2,640 4,210 6,380 9,310 14,700 Penrose, Colo. 07099080 Red Creek below Sullivan Park at Fort 256 1,510 3,630 9,000 15,900 26,200 41,000 69,600 Carson, Colo. 07099215 Turkey Creek near Fountain, Colo. 53.5 178 323 593 866 1,210 1,630 2,310 07099220 Little Turkey Creek near Fountain, Colo. 26.2 73.4 125 218 313 431 576 818 07099230 Turkey Creek above Teller Reservoir near 119 831 2,160 5,750 10,600 18,000 28,900 50,500 Stone City, Colo. 07103700 Fountain Creek near Colorado Springs, Colo. 400 824 1,190 1,760 2,260 2,830 3,460 4,410 07103703 Camp Creek at Garden of the Gods, Colo. 12.7 57.5 126 289 493 796 1,230 2,090 07103747 Monument Creek at Palmer Lake, Colo. 62.6 152 233 359 467 587 719 909 07103960 Kettle Creek above U.S. Air Force Academy, Colo. 188 587 1,060 1,980 2,970 4,260 5,940 8,860 07103977 Cottonwood Creek at Cowpoke Road at Colorado 69.2 114 147 193 229 267 306 362 Springs, Colo. 07104000 Monument Creek at Pikeview, Colo. 1,420 2,730 3,740 5,140 6,240 7,380 8,560 10,200 07104050 North Rockrimmon Creek above Delmonico 429 552 626 713 775 833 890 962 Drive at Colorado Springs, Colo. 07105000 Bear Creek near Colorado Springs, Colo. 13.9 40.1 69.1 123 178 247 333 478 07105490 Cheyenne Creek at Evans Avenue at Colorado 104 254 408 676 939 1,260 1,660 2,310 Springs, Colo. 07105900 Jimmy Camp Creek at Fountain, Colo. 516 2,050 4,470 10,800 19,500 33,900 57,100 110,000 07105920 Little Fountain Creek above Keaton Reservoir, 69.1 210 381 732 1,130 1,660 2,390 3,730 near Fort Carson, Colo. 07105940 Little Fountain Creek near Fountain, Colo. 266 808 1,420 2,540 3,670 5,080 6,820 9,690 Appendixes 55

Table 3–1. Summary of the annual exceedance-probability discharges at the 188 streamgages used in the regression analysis of natural streams in eastern Colorado, 2015.—Continued

Annual exceedance-probability discharge, Streamgage information in cubic feet per second USGS

streamgage Streamgage name Q2 Q5 Q10 Q25 Q50 Q100 Q200 Q500 number 07105945 Rock Creek above Fort Carson Reservation, Colo. 39.9 133 260 547 900 1,430 2,200 3,750 07106500 Fountain Creek at Pueblo, Colo. 4,630 10,000 15,200 23,900 32,200 42,300 54,400 73,900 07107500 St. Charles River at Burnt Mill, Colo. 921 2,890 5,210 9,700 14,400 20,600 28,500 42,000 07108900 St. Charles River at Vineland, Colo. 2,370 5,460 8,600 14,200 19,700 26,600 35,100 49,600 07111000 Huerfano River at Manzanares Crossing, near 205 542 961 1,860 2,920 4,470 6,720 11,200 Redwing, Colo. 07112500 Huerfano River at Badito, Colo. 963 2,180 3,350 5,300 7,130 9,300 11,900 16,000 07114000 Cucharas River at Boyd Ranch near La Veta, 111 220 308 438 546 663 789 970 Colo. 07116000 Huerfano River below Huerfano Valley Dam near 3,670 7,320 10,400 14,800 18,600 22,700 27,200 33,700 Undercliffe, Colo. 07118000 Apishapa River near Aguilar, Colo. 2,430 3,750 4,670 5,840 6,730 7,620 8,520 9,730 07120620 Big Arroyo near Thatcher, Colo. 56.0 250 518 1,090 1,720 2,560 3,650 5,520 07121500 Timpas Creek at Mouth near Swink, Colo. 1,240 3,250 5,370 9,180 13,000 17,700 23,600 33,300 07122400 Crooked Arroyo near Swink, Colo. 167 395 635 1,070 1,520 2,090 2,810 4,060 07123675 Horse Creek near Las Animas, Colo. 88.8 338 712 1,630 2,840 4,750 7,670 13,900 07124300 Long Canyon Creek near Madrid, Colo. 1,190 2,240 3,100 4,330 5,350 6,450 7,640 9,350 07124500 Purgatoire River at Trinidad, Colo. 5,790 12,100 17,400 25,400 32,100 39,500 47,600 59,200 07125100 Frijole Creek near Alfalfa, Colo. 1,640 3,770 5,840 9,300 12,600 16,500 21,100 28,400 07125500 San Francisco Creek near Alfalfa, Colo. 2,530 5,010 7,090 10,200 12,800 15,700 18,900 23,500 07126100 Luning Arroyo near Model, Colo. 580 1,730 3,140 6,030 9,290 13,800 19,900 31,400 07126140 Van Bremer Arroyo near Tyrone, Colo. 43.3 186 379 783 1,230 1,820 2,570 3,880 07126200 Van Bremer Arroyo near Model, Colo. 476 1,790 3,440 6,680 10,100 14,500 19,900 29,100 07126325 Taylor Arroyo below Rock Crossing, near 188 705 1,360 2,690 4,110 5,980 8,360 12,400 Thatcher, Colo. 07126390 Lockwood Canyon Creek near Thatcher, Colo. 108 333 580 1,020 1,460 1,990 2,620 3,620 07126415 Red Rock Canyon Creek at Mouth near 407 1,010 1,620 2,660 3,660 4,870 6,330 8,670 Thatcher, Colo. 07126470 Chacuaco Creek at Mouth near Timpas, Colo. 1,790 4,650 7,650 13,000 18,300 24,900 32,900 46,300 07126480 Bent Canyon Creek at Mouth near Timpas, Colo. 141 529 1,030 2,040 3,130 4,570 6,430 9,620 07126500 Purgatoire River at Ninemile Dam, near Higbee, 5,800 14,700 24,100 41,100 58,100 79,500 106,000 151,000 Colo. 07133200 Clay Creek Tributary near Deora, Colo. 33.5 711 3,170 14,400 36,900 83,600 173,000 405,000 07134100 Big Sandy Creek near Lamar, Colo. 235 623 1,030 1,770 2,500 3,410 4,530 6,380 07134990 Wild Horse Creek above Holly, Colo. 193 446 697 1,130 1,550 2,070 2,700 3,740 07135000 Two Butte Creek near Holly, Colo. 101 464 982 2,100 3,380 5,100 7,350 11,300 07138600 White Woman Creek Tributary near Selkirk, 62.3 159 257 427 590 788 1,030 1,410 Kans. 07138650 White Woman Creek near Leoti, Kans. 203 744 1,420 2,760 4,180 6,030 8,360 12,300 07138800 Lion Creek Tributary near Modoc, Kans. 134 168 189 213 229 245 260 279 07140600 Pawnee River Tributary near Kalvesta, Kans. 234 710 1,280 2,440 3,710 5,440 7,740 11,900 07141400 South Fork Walnut Creek Tributary near 66.6 99.4 123 154 179 204 231 268 Dighton, Kans. 07153500 Dry Cimarron River near Guy, N. Mex. 2,800 6,680 10,800 18,200 25,900 35,700 48,200 69,900 07154400 Carrizozo Creek near Kenton, Okla. 1,590 4,090 6,570 10,700 14,600 19,100 24,400 32,700 07154500 Cimarron River near Kenton, Okla. 3,650 10,000 16,600 28,200 39,300 52,700 68,700 94,200 07154650 Tesesquite Creek near Kenton, Okla. 1,220 3,920 6,950 12,400 17,800 24,400 32,200 44,700 07155100 Cold Springs Creek near Wheeless, Okla. 55.2 282 632 1,450 2,440 3,840 5,760 9,320 07155590 Cimarron River near Elkhart, Kans. 131 2,140 8,120 30,600 68,700 138,000 253,000 511,000 07155900 North Fork Cimarron River Tributary near 34.5 736 3,200 14,000 34,600 75,400 150,000 333,000 Elkhart, Kans. 07156000 North Fork Cimarron River Tributary near 709 2,460 4,570 8,640 12,900 18,300 25,100 36,400 Richfield, Kans. 07156010 North Fork Cimarron River at Richfield, Kans. 763 3,530 8,030 19,500 35,000 59,500 97,000 177,000 07156100 Sand Arroyo Creek near Johnson, Kans. 70.8 247 458 864 1,290 1,820 2,480 3,580 07156220 Bear Creek near Johnson, Kans. 927 2,580 4,350 7,470 10,500 14,300 18,800 26,200 07156600 Cimarron River Tributary near Moscow, Kans. 636 1,270 1,790 2,560 3,210 3,910 4,670 5,780 56 Paleoflood Investigations to Improve Peak-Streamflow Regional-Regression Equations, Eastern Colorado, 2015

Table 3–1. Summary of the annual exceedance-probability discharges at the 188 streamgages used in the regression analysis of natural streams in eastern Colorado, 2015.—Continued

streamgage Streamgage name Q2 Q5 Q10 Q25 Q50 Q100 Q200 Q500 number 07156700 Cimarron River Tributary near Satanta, Kans. 127 493 957 1,880 2,860 4,110 5,690 8,330 07157100 Crooked Creek near Copeland, Kans. 454 1,550 2,820 5,180 7,550 10,500 14,000 19,700 07157400 Crooked Creek Tributary at Meade, Kans. 238 1,360 3,170 7,460 12,700 20,100 30,200 48,700 07157500 Crooked Creek near Englewood, Kans. 2,030 5,320 8,520 13,800 18,500 24,000 30,100 39,500 07157550 West Fork Creek near Knowles, Okla. 90.1 299 528 927 1,300 1,740 2,250 3,010 07199000 Canadian River near Hebron, N. Mex. 3,120 7,170 11,100 17,700 24,000 31,600 40,700 55,200 07201000 Raton Creek at Raton, N. Mex. 339 841 1,340 2,180 2,970 3,920 5,030 6,800 07201200 Chicorica Creek Tributary near Raton, N. Mex. 50.2 175 329 637 968 1,400 1,960 2,920 07201450 Green Mountain Arroyo near Raton, N. Mex. 43.4 432 1,370 4,500 9,540 18,500 33,500 67,900 07202000 Chicorica Creek near Hebron, N. Mex. 1,660 3,700 5,560 8,500 11,100 14,200 17,600 22,800 07203000 Vermejo River near Dawson, N. Mex. 1,370 3,220 4,910 7,570 9,920 12,600 15,600 20,000 07203600 Rio Del Plano Tributary near Taylor Springs, 121 301 476 768 1,040 1,350 1,720 2,290 N. Mex. 07204000 Moreno Creek at Eagle Nest, N. Mex. 60.8 116 157 212 254 297 340 398 07204500 Cieneguilla Creek near Eagle Nest, N. Mex. 101 224 330 488 621 766 921 1,140 07205000 Sixmile Creek near Eagle Nest, N. Mex. 24.7 48.1 68.6 101 130 163 201 260 07206400 Clear Creek near Ute Park, N. Mex. 22.7 46.3 67.4 101 130 165 204 265 07207500 Ponil Creek near Cimarron, N. Mex. 343 1,010 1,740 3,060 4,380 6,010 7,990 11,200 07208500 Rayado Creek near Cimarron, N. Mex. 134 331 549 964 1,400 1,990 2,750 4,120 07211500 Canadian River near Taylor Springs, N. Mex. 3,890 9,550 16,100 29,300 44,100 64,800 93,300 148,000 07213700 Canadian River Tributary near Mills, N. Mex. 121 873 2,230 5,690 10,100 16,400 25,100 41,200 07214800 Rio La Casa near Cleveland, N. Mex. 194 450 715 1,190 1,670 2,280 3,050 4,360 07220000 Sapello River at Sapello, N. Mex. 2,430 4,220 5,610 7,590 9,210 11,000 12,800 15,500 07220900 Dog Creek near Shoemaker, N. Mex. 710 1,830 2,920 4,710 6,330 8,200 10,300 13,600 07221600 Lagartija Creek Tributary near Sanchez, N. Mex. 194 503 822 1,380 1,920 2,580 3,380 4,670 07222300 Trementina Creek at Trementina, N. Mex. 1,980 4,590 6,980 10,700 14,000 17,700 21,900 28,000 07222500 Conchas River at Variadero, N. Mex. 3,000 7,180 11,800 20,700 30,400 43,400 60,600 92,300 07222800 Garita Creek Tributary near Variadero, N. Mex. 635 2,160 3,860 6,860 9,720 13,100 17,000 23,000 07225300 Bluewater Creek near Tucumcari, N. Mex. 497 1,160 1,760 2,700 3,510 4,420 5,420 6,900 07225500 Ute Creek near Gladstone, N. Mex. 6,200 9,230 11,400 14,200 16,300 18,500 20,800 23,900 07226200 Bueyeros Creek at Bueyeros, N. Mex. 466 1,650 3,180 6,370 9,960 14,900 21,400 33,300 07226500 Ute Creek near Logan, N. Mex. 4,540 11,000 17,200 27,500 37,000 48,100 60,900 80,800 07227100 Revuelto Creek near Logan, N. Mex. 5,230 9,430 12,900 18,300 22,900 28,100 34,000 42,800 07227150 Arroyo Del Puerto near Endee, N. Mex. 196 607 1,060 1,890 2,700 3,690 4,880 6,790 07227200 Tramperos Creek near Stead, N. Mex. 841 2,690 4,770 8,540 12,300 16,800 22,200 30,900 07227295 Sandy Arroyo Tributary near Clayton, N. Mex. 39.1 130 234 423 609 837 1,110 1,540 07227300 Sand Draw near Clayton, N. Mex. 115 521 1,110 2,410 3,930 6,040 8,880 14,000 07227920 Dixon Creek near Borger, Tex. 1,130 2,440 3,570 5,270 6,720 8,310 10,000 12,500 07232500 Beaver River near Guymon, Okla. 3,810 13,400 24,800 46,700 69,100 97,300 132,000 189,000 07232550 South Fork Tributary near Guymon, Okla. 6.80 26.3 51.2 101 153 221 307 450 07232650 Aqua Frio Creek near Felt, Okla. 60.1 224 435 869 1,350 1,990 2,820 4,280 07232900 Coldwater Creek near Guymon, Okla. 62.6 713 2,320 7,630 15,900 30,000 52,500 101,000 07233500 Palo Duro Creek near Spearman, Tex. 1,890 5,940 10,700 20,100 30,000 42,900 59,500 88,300 07233850 Sharp Creek Tributary near Turpin, Okla. 32.3 70.0 104 156 203 256 316 406 07234050 North Fork Clear Creek Tributary near 31.2 358 1,150 3,720 7,600 14,100 24,200 45,400 Balko, Okla. 07234100 Clear Creek near Elmwood, Okla. 1,050 5,030 10,700 23,100 37,000 55,600 79,700 121,000 07301410 Sweetwater Creek near Kelton, Tex. 388 898 1,350 2,050 2,650 3,310 4,040 5,090 NA Raton Creek above Starkville, Colo. 137 506 1,000 2,090 3,360 5,160 7,650 12,300 Regional Regression Equations for Estimation of Natural Streamflow Statistics in Colorado

By Joseph P. Capesius and Verlin C. Stephens

Prepared in cooperation with the Colorado Water Conservation Board and the Colorado Department of Transportation

Scientific Investigations Report 2009–5136

U.S. Department of the Interior U.S. Geological Survey Regional Regression Equations for Estimation of Natural Streamflow Statistics in Colorado 5 100 P 2 1.9 1.9 1.9 2.1 3 2.8 3.1 2.6 2.1 3.3 2.9 2.4 2.5 2.6 2.8 2.8 2.9 2.8 2.4 2.1 2.1 2.1 2.3 2.2 2.1 2 2 2 2.8 2.4 2.6 2.4 2.5 3.5 2.9 2.9 3.4 3.1 3.1 3.5 2.1 2.1 6 , 6-hour, , 6-hour, 8.2 7500 100 34.6 89.3 46.2 94.4 97.8 86.6 77.7 95.6 67.7 98.5 91 23.7 98.1 91.2 25.2 78 69 99.2 A P 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 6 A , drainage area, in E 9,118 9,168 9,275 8,994 9,027 9,726 7,294 8,255 9,794 7,421 9,962 9,959 9,484 9,403 9,457 9,048 8,384 8,146 7,759 8,319 9,464 6,987 9,606 8,303 7,207 7,987 7,826 7,093 8,483 9,799 11,119 11,027 11,182 11,246 11,296 11,009 10,174 10,503 10,642 10,825 10,345 10,152 10,054 P 23.5 30.4 24.4 20.5 21.3 31.7 20.6 30.9 23.5 40.8 30.9 20.4 24.8 27.1 25 24.4 38.2 38.3 31.4 33.2 47.1 35.5 35.3 44.3 39.5 30.3 21.3 15.8 22.4 29 20.8 29.6 24.3 25 21.5 24.8 23.1 20.3 22.8 22.4 20.6 23.4 35.3 A above 7,500 feet elevation plus 1; S 8.9 7.6 7.3 11.5 12.8 21.7 16.8 13.7 14.1 24.6 32.8 36.4 45.0 25.7 29.9 44.3 44.5 36.9 39.2 40.8 33.6 37.3 35.3 43.2 22.6 18.5 23.2 24.3 14.3 22.9 10.9 31.6 18.4 33.7 34.8 31.7 18.9 31.9 25.7 28.2 23.4 25.1 19.7 , percentage of 7500 A 3.9 3.6 1.5 8.9 7.6 22.1 43.6 15.2 24.6 20.5 43.7 32.5 13.4 27.8 36.5 59.8 38.1 65.8 34 14.4 25.5 23.7 92.6 22.2 43.6 50.2 62.8 A 118.1 107 182.1 255.4 475.9 134.1 146.6 392.3 201.5 191.4 230.2 126.9 475.7 302.6 103.2 167.9 5 5 9 8 25 24 24 10 10 18 32 13 53 16 24 87 34 13 47 43 15 10 60 53 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA YRSANN E , mean watershed elevation, in feet; 7 9 11 11 26 12 25 25 10 12 24 18 32 13 49 12 62 15 24 19 51 33 14 47 42 18 10 13 13 13 14 14 58 36 60 41 23 14 10 13 27 67 41 YRSPK LNGDEG 106.0211 105.9117 106.3075 106.5256 106.2795 106.2906 106.3372 106.2700 105.3486 105.5019 105.2772 105.5856 105.1989 105.6269 105.6261 105.5714 105.2489 105.5283 105.5144 105.4444 105.5044 105.8650 106.5173 106.5206 106.8248 106.7784 107.0006 106.6267 106.3453 106.3172 106.3053 105.6958 105.3036 105.6586 105.1758 105.0025 105.3367 105.3217 105.1978 105.2322 105.1686 104.7633 106.2228 P , mean annual precipitation, in inches; 41.0811 40.7411 40.0117 LATDEG 41.0500 40.7264 40.8616 41.1833 39.9147 39.8778 40.3453 40.4539 40.5516 39.7164 39.7505 40.2189 40.0908 40.1667 39.9617 40.4961 40.5494 41.2083 41.3702 41.0236 41.2139 41.4000 41.6989 41.6530 41.7166 41.6400 39.2869 39.2089 39.4572 39.4089 39.4844 39.6328 39.6305 39.6803 39.6158 39.6355 39.3558 39.7658 41.5852 39.3394 region Hydrologic Mountain Mountain Mountain Mountain Mountain Mountain Plains Mountain Plains Mountain Mountain Mountain Plains Mountain Mountain Mountain Mountain Plains Mountain Mountain Mountain Mountain Mountain Mountain Northwest Northwest Mountain Northwest Mountain Mountain Mountain Mountain Plains Plains Mountain Mountain Plains Plains Plains Plains Mountain Mountain Mountain S , mean watershed slope, in percent; Drainage-basin and climatic characteristics at streamflow-gaging stations used for regional regression analysis.—Continued

Station number 06631100 06711000 06622000 06618500 06619000 06620400 06621000 06729000 06730300 06732000 06739500 06617100 06748200 06717400 06719500 06721500 06722500 06723000 06725500 06726900 06614800 06616000 06622500 06622700 06623800 06624500 06627500 06629100 06630800 06631000 06699005 06700500 06706000 06707000 06709500 06710385 06710400 06710600 06710990 06712000 06716500 06632400 06696980 100-year precipitation, in inches; NA, not applicable, station operated as peak-only or flood-hydrograph station] square miles; Table 1. Table YRSANN, years of record for annual streamflow; YRSPK, years of record for peak streamflow; latitude in decimal degrees; LNGDEG, longitude [LATDEG, 6 Regional Regression Equations for Estimation of Natural Streamflow Statistics in Colorado 100 P 3.9 3.9 4.1 3.8 3.8 4.1 4.2 3.6 3.6 3.3 3.5 4 4 2.8 2.8 2.8 3 3.5 3.3 3.3 3.4 3.1 3.4 3.7 4.6 4.4 4.5 4.4 4.4 4.6 2.2 2.2 2.5 2.7 2.7 2.7 2.5 2.4 2.7 2.4 3.3 3.6 3.6 6 , 6-hour, , 6-hour, 6.5 0 0 0 0 0 0 0 5.6 0 0 3.8 0 0 0 0 0 0 0 0 7500 100 42.7 24.7 75.7 52.9 60 89.6 98.3 97.2 81.4 51.7 23.6 89.1 A P 100 100 100 100 100 100 100 100 100 100 100 6 A , drainage area, in E 7,366 6,077 6,642 5,479 5,521 5,300 5,330 5,161 8,193 7,964 9,883 8,062 5,582 4,871 9,833 9,866 7,808 7,002 5,923 5,849 5,850 5,339 5,348 3,899 3,654 4,333 3,619 3,698 3,964 9,356 9,189 8,428 8,143 6,860 8,832 11,433 11,146 11,955 11,380 11,379 10,878 10,800 10,096 P 19.5 15.6 18 14 14.3 15.5 14.1 13.9 22.5 22.1 27.3 22 14.7 13.6 24 20 21.3 18.9 19.8 18.1 17.3 15.6 16.8 16.3 18.2 18.3 17.7 19.5 19.5 18 25.3 22 30.8 34.5 22.2 22.5 18.3 13.8 21.2 16.7 20.4 19.2 24 A above 7,500 feet elevation plus 1; S 2.8 2.8 1.7 4.4 4.6 6.2 3.9 7.0 5.7 9.2 4.0 2.0 2.6 2.2 4.3 3.0 1.6 1.0 2.5 25.5 10.0 13.5 48.5 28.6 35.4 27.0 22.4 26.7 28.9 10.4 33.4 22.8 32.8 49.0 45.8 47.1 36.1 22.7 19.5 26.2 27.9 25.1 48.7 , percentage of 7500 A 0.6 6.8 0.9 6.5 2.7 7.6 6.8 11 79.1 84.8 48.7 48.6 53.1 15.6 12.4 92.6 13.5 19.8 85.7 20.1 51.2 45.7 23.8 23.5 68.5 83 62.2 A 115.4 211.6 211 100.1 162.2 161.4 171.4 140.1 510.9 176.8 268.9 696.2 320.5 436.3 213.8 1,216.1 11 11 13 13 23 21 21 61 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA YRSANN E , mean watershed elevation, in feet; 8 11 11 11 11 11 18 13 14 16 41 24 22 21 28 18 46 21 41 13 13 23 35 10 10 10 64 25 65 26 22 33 33 14 60 48 20 14 23 66 32 28 12 YRSPK LNGDEG 104.0811 104.6053 104.1941 104.1450 104.0155 103.9580 103.9202 103.8280 104.8466 104.7936 105.0528 104.6658 104.0216 103.6561 105.6617 105.5650 105.4936 105.1944 104.4755 104.4508 104.1633 103.8931 104.0808 103.4436 102.2694 101.8667 102.2521 101.4660 101.6329 101.3479 106.3406 106.3409 106.3950 106.3892 106.2222 106.1600 105.9897 105.8600 105.4836 105.1914 104.9642 104.8272 104.8586 P , mean annual precipitation, in inches; 37.1147 LATDEG 37.2000 37.1684 37.3045 37.3456 37.4242 37.4928 38.0517 37.4200 37.3864 37.5547 38.0031 40.6386 40.6230 40.6469 41.1264 39.3372 39.6130 39.4925 41.2564 41.2278 41.3197 39.5200 39.9067 40.0394 39.5755 39.2853 39.3206 39.0179 39.2597 39.2642 39.2697 39.1722 38.8128 38.7336 38.5214 38.4672 38.1861 38.4364 38.3742 38.4650 38.6817 38.7075 region Hydrologic Plains Plains Plains Plains Plains Plains Plains Rio Grande Plains Plains Plains Plains Mountain Mountain Mountain Plains Plains Plains Plains Plains Plains Plains Plains Plains Plains Plains Plains Plains Plains Mountain Mountain Mountain Mountain Mountain Mountain Mountain Plains Plains Plains Plains Plains Plains Plains S , mean watershed slope, in percent; Drainage-basin and climatic characteristics at streamflow-gaging stations used for regional regression analysis.—Continued

Station number 07114000 07118000 07125100 07125500 07126100 07126200 07126325 07126390 07107500 07120620 07121500 07124300 06748510 06748530 06748600 06755000 06758200 06758250 06758700 06761900 06762500 06762600 06821300 06821400 06823500 06825500 06844700 06844800 06858500 07079500 07081000 07082000 07083000 07089000 07091000 07093500 07093775 07095000 07096500 07099100 07099230 07105920 07105945 100-year precipitation, in inches; NA, not applicable, station operated as peak-only or flood-hydrograph station] square miles; Table 1. Table YRSANN, years of record for annual streamflow; YRSPK, years of record for peak streamflow; latitude in decimal degrees; LNGDEG, longitude [LATDEG, Regional Regression Equations for Estimation of Natural Streamflow Statistics in Colorado 7 100 P 2.6 4.3 2.3 2.4 2.7 2.7 2.5 2.3 2.1 2.6 2.2 2.3 4.4 4.2 4.2 4.6 4.9 5.1 5.1 5.1 4.8 3.6 3.9 3.9 3.3 3.3 3 3.1 3.3 3.3 3.5 3.3 4.1 4.6 4.5 4.3 4.5 4.7 4.1 4.3 5 4.4 6 , 6-hour, , 6-hour, 0 0 0 0.8 0 0 0 0 0 2.3 0 0.1 0 0 0 3.4 0 0 0 0 7500 100 59.1 50.8 24 70.7 90.4 97.1 65.6 A P 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 6 A , drainage area, in E 4,411 4,593 9,949 4,555 4,624 5,001 3,669 3,946 4,149 2,983 7,594 7,608 7,120 8,016 9,405 9,151 9,405 9,810 8,589 9,550 8,106 6,532 5,182 4,463 4,981 5,607 3,858 6,251 4,968 4,431 3,650 5,087 11,473 11,294 10,872 10,723 10,398 10,507 10,356 10,405 10,056 10,259 P 38.4 16.6 30.6 37.4 38.2 33.6 31.8 18.8 20.8 30.1 26.5 31.1 17.2 17.1 17.0 17.3 17.2 17 17 18.6 20.1 20.9 19 20.6 21.1 23.6 21.7 25.9 21.5 26.2 20.7 17.2 16.2 17.3 13.9 15.6 17 17.2 14.1 16 17.7 16.7 A above 7,500 feet elevation plus 1; S 1.1 1.8 8.4 0.6 0.9 1.5 1.6 1.7 6.2 2.0 3.0 8.6 1.4 5.2 1.1 11.2 11.3 11.8 33.7 40.5 35.7 31.3 30.7 34.6 35.8 22.8 64.6 27.6 27.8 12.0 23.6 23.8 16.2 23.7 26.3 19.4 28.1 48.2 27.4 24.2 21.6 13.5 , percentage of 7500 A 5.2 7.2 1.2 2.4 33.9 34.2 91.9 52.7 30.7 45.4 12.9 62.2 48.7 24.9 10.6 57.1 21.5 14.6 78.8 73.2 10.5 60.1 56.1 25.2 A 411.3 112.2 107.6 210.6 516.9 106.2 584.2 813.3 199.1 295.2 185.4 949 268.7 421.3 500.3 529.2 2,926.6 2,033 65 31 37 80 38 23 58 87 34 39 47 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA YRSANN E , mean watershed elevation, in feet; 11 12 32 36 80 47 25 59 87 46 57 68 54 23 22 18 35 34 15 15 32 33 40 48 30 76 69 68 72 40 57 83 75 12 42 57 16 21 20 33 53 39 YRSPK LNGDEG 102.7866 106.9275 106.8300 106.6492 106.4500 106.2595 106.0897 106.2906 105.6928 106.3195 106.3186 106.3348 103.7255 102.9016 102.8049 101.8979 101.8988 101.7754 101.7616 101.7616 101.0504 104.4622 104.4361 104.3333 104.7867 105.2678 105.2656 105.2753 105.1750 104.9461 104.9689 104.5986 103.9255 103.3186 101.4896 103.6322 103.6483 101.4882 103.4241 103.0183 102.7405 101.6216 P , mean annual precipitation, in inches; LATDEG 38.4811 37.8561 37.7519 37.6569 37.5917 37.4903 38.2203 38.1633 38.0136 37.8597 37.8133 37.3747 37.5153 36.8978 36.7722 37.1220 37.1909 37.2584 37.5000 37.6264 37.3353 36.7872 36.9058 36.8308 36.6817 36.5539 36.4853 36.5186 36.5264 36.5739 36.3725 36.3603 36.3259 36.3889 36.7214 36.5564 37.5439 37.5892 36.9875 36.8833 37.7242 38.5250 region Hydrologic Rio Grande Rio Grande Rio Grande Rio Grande Rio Grande Rio Grande Rio Grande Rio Grande Rio Grande Rio Grande Rio Grande Plains Plains Plains Plains Plains Plains Plains Plains Plains Plains Plains Plains Plains Rio Grande Rio Grande Rio Grande Rio Grande Plains Plains Plains Plains Plains Plains Plains Plains Plains Plains Plains Plains Plains Plains S , mean watershed slope, in percent; Drainage-basin and climatic characteristics at streamflow-gaging stations used for regional regression analysis.—Continued

Station number 07211000 08216500 08218500 08219500 08220500 08223500 08224500 08227000 08227500 08230500 08231000 08236000 07126415 07154650 07155100 07155590 07155900 07156010 07156100 07156220 07156600 07199000 07201000 07201200 07203000 07204000 07204500 07205000 07206400 07207500 07208500 07225500 07227295 07232500 07232650 07126470 07126480 07153500 07154400 07133200 07138600 07138650 100-year precipitation, in inches; NA, not applicable, station operated as peak-only or flood-hydrograph station] square miles; Table 1. Table YRSANN, years of record for annual streamflow; YRSPK, years of record for peak streamflow; latitude in decimal degrees; LNGDEG, longitude [LATDEG, 8 Regional Regression Equations for Estimation of Natural Streamflow Statistics in Colorado 100 P 2.3 3.5 3.6 3.4 3.5 3.3 3.3 3.1 3 2.9 2.1 2.2 2.1 2.3 2.2 2.3 2.2 2.2 2 2.1 2.1 2.3 2.3 2.6 2.5 2.7 2.9 2.5 3.4 3.1 2.9 3.3 3.5 3.3 3.2 2.9 2.9 2.9 2.5 2.8 3.2 2.9 6 , 6-hour, , 6-hour, 7500 100 83.7 99.8 98.9 97.7 99.4 99.9 94.4 75.3 77.7 99.9 80.5 A P 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 6 A , drainage area, in E 9,401 9,608 9,040 9,630 9,973 9,538 9,756 9,737 9,169 9,353 9,861 9,192 9,352 9,362 9,724 8,856 9,304 7,792 8,140 9,157 8,492 11,313 11,077 11,106 11,793 11,559 11,218 11,023 10,641 10,929 10,973 10,149 10,389 10,680 10,767 10,738 10,453 10,509 10,492 10,152 10,481 10,599 P 35.8 29.6 27 28.9 30.2 26.3 28.3 23.3 25.1 24.6 36.8 28.6 25.8 32.8 29 30.5 28.7 34.8 26.5 25.8 26.7 32.3 30.7 23.2 19.4 22.3 45 35.3 25.2 30.6 23.5 26.9 28.7 27.7 26.6 34.2 26.1 30.2 20 18.9 24.6 19.7 A above 7,500 feet elevation plus 1; S 50.2 39.2 35.0 41.7 37.6 42.4 55.2 43.1 40.2 31.2 42.5 42.1 29.5 38.9 36.3 29.7 27.0 23.3 29.3 26.6 29.7 49.7 46.0 41.2 25.1 32.5 35.0 27.8 14.6 21.7 15.2 23.5 29.9 32.7 33.5 25.8 15.6 20.2 13.6 15.6 20.2 20.2 , percentage of 7500 A 2.2 8.1 5.5 A 11.2 11.7 47.8 10.6 19.2 37.1 66.6 63 60.8 45.8 35.2 27.8 32.8 19.9 51.1 16.4 52.7 40.2 44.2 25.6 18.5 80.4 38 28.1 50.6 48 112.2 115.7 411.9 109.2 295.9 823.9 182.9 281.6 152.8 372.9 475.3 192.5 143.9 8 9 28 25 14 77 73 67 56 17 42 18 97 73 73 26 19 23 86 42 50 48 37 67 17 97 67 88 59 52 23 52 28 19 75 NA NA NA NA NA NA NA YRSANN E , mean watershed elevation, in feet; 5 27 69 10 32 24 75 70 51 72 19 10 19 20 33 14 17 21 10 28 41 28 32 59 58 67 14 43 82 88 59 68 70 50 24 13 24 51 34 33 33 75 YRSPK LNGDEG 105.2811 105.8114 105.7497 105.4103 105.5478 105.3895 105.5686 105.5561 105.6856 105.5036 105.5492 106.0092 105.7767 105.8783 105.7656 105.8236 105.7775 105.7947 105.9553 106.0881 105.9064 105.9283 106.0261 105.2950 105.4150 105.4258 106.5250 106.1875 106.0386 106.0736 105.8781 105.2544 105.2603 105.5817 105.5789 106.5367 106.5575 106.6331 106.7048 106.4853 106.2395 106.0442 P , mean annual precipitation, in inches; 40.1125 LATDEG 40.1805 36.9528 36.8292 36.6223 36.7034 36.5419 36.5322 36.4394 36.3756 39.9000 39.9100 39.9500 39.9975 40.0508 40.0867 40.0853 40.0833 39.7603 39.7789 39.7972 37.3747 37.4250 37.4472 37.3539 37.0539 36.9931 36.9822 37.1770 36.8983 36.8969 36.8842 36.2989 36.3320 36.9556 36.6986 36.6625 36.6681 36.3172 36.3917 36.3497 40.2533 region Hydrologic Mountain Rio Grande Rio Grande Rio Grande Rio Grande Rio Grande Rio Grande Rio Grande Rio Grande Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Rio Grande Rio Grande Rio Grande Rio Grande Rio Grande Rio Grande Rio Grande Rio Grande Rio Grande Rio Grande Rio Grande Rio Grande Rio Grande Rio Grande Rio Grande Rio Grande Rio Grande Rio Grande Rio Grande Rio Grande Mountain S , mean watershed slope, in percent; Drainage-basin and climatic characteristics at streamflow-gaging stations used for regional regression analysis.—Continued

Station number 09020000 08255000 08263000 08264000 08265000 08267500 08268500 08269000 08275000 08275500 09016500 09024000 09026500 09032000 09032500 09033000 09033500 09034000 09034500 09034900 09035500 09035700 08240500 08241500 08242500 08245500 08246500 08247500 08248000 08248500 08252500 08253000 08253500 08275600 08281200 08284000 08284100 08284500 08286650 08288000 08289000 09012500 100-year precipitation, in inches; NA, not applicable, station operated as peak-only or flood-hydrograph station] square miles; Table 1. Table YRSANN, years of record for annual streamflow; YRSPK, years of record for peak streamflow; latitude in decimal degrees; LNGDEG, longitude [LATDEG, Regional Regression Equations for Estimation of Natural Streamflow Statistics in Colorado 9 100 P 2.2 2.3 2.4 2.3 2.1 2.2 2.2 2.4 2.2 2.4 2.2 2.2 2.2 2.2 2.1 3 2.4 2.5 2.4 2.3 2.3 2.2 2.3 2.1 2.2 2.2 2 2.2 2.3 2.4 2.1 2.2 2.2 2.4 2.3 2.4 2.3 2.3 2.4 2.4 2.3 2.3 6 , 6-hour, , 6-hour, 7500 100 99.1 99.9 99.9 99.8 88.3 A P 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 6 A , drainage area, in E 9,390 9,600 9,848 9,722 9,951 9,689 9,481 9,869 9,266 8,907 11,116 11,238 11,199 11,029 11,431 11,215 11,762 11,439 11,263 11,034 11,497 11,184 11,088 11,074 10,024 10,575 10,305 10,456 10,771 10,890 10,945 10,989 10,526 10,913 10,879 10,823 10,721 10,922 10,713 10,904 10,504 10,399 P 29.3 29 31.8 32.5 24.4 28.9 27.6 29.6 25.8 36.4 27.9 26.7 26.1 24.7 23.1 42.7 28.6 31.9 29.9 28.9 28.8 28.3 28.7 28.2 28.3 23.2 20.6 28 27 29.8 26.2 26.7 28.1 27.8 30.8 30.5 28 31.4 30.6 28.5 25.7 26.6 A above 7,500 feet elevation plus 1; S 9.6 18.8 35.3 48.9 52.8 25.8 28.2 22.5 28.2 33.0 46.9 40.6 37.1 39.5 35.4 33.6 42.0 47.9 36.7 28.1 34.1 37.5 42.1 36.8 36.7 30.0 25.2 34.2 31.8 41.9 35.2 34.0 34.2 38.0 47.0 50.5 31.7 60.1 58.0 53.5 36.9 30.7 , percentage of 7500 A 8.6 7.6 3.3 3 3.6 6.5 6.1 8.6 6.6 8.8 9.1 9.5 4.5 5.3 6.1 5.9 7.4 A 11.5 11.1 47.8 92.2 14 93.4 32.3 71.5 62.6 42.1 27.4 13.9 44.6 75.7 57.8 23.8 58.2 34.2 14.5 12.5 101 395.1 944.6 107.4 128.2 9 8 11 28 50 28 28 33 40 40 63 25 12 22 12 61 20 43 16 10 10 44 42 42 10 40 36 13 50 58 50 43 44 71 47 53 53 44 41 43 43 44 YRSANN E , mean watershed elevation, in feet; 11 11 28 49 26 27 10 33 40 38 62 12 22 60 20 13 16 10 10 43 25 41 41 10 40 37 13 10 44 58 49 40 43 32 46 50 51 40 33 40 42 43 YRSPK LNGDEG 106.1106 106.6559 106.1734 106.1925 106.2678 106.4575 106.4456 106.4267 106.5839 106.4400 106.5225 106.7631 106.9348 106.9537 107.3103 106.8145 106.6559 106.6900 106.7184 106.7975 106.8123 106.0264 106.0306 106.0172 106.3131 106.2834 106.3736 106.0447 106.0520 105.9431 105.9725 106.3236 106.3361 106.3678 106.4125 106.2781 106.2650 106.2934 106.3025 106.3231 106.3823 106.4014 P , mean annual precipitation, in inches; 40.0411 LATDEG 39.7280 39.7630 39.8528 39.7039 39.6983 39.7317 39.8000 39.6317 39.5572 39.5455 39.6494 39.7166 39.1894 39.2139 39.1964 39.1889 39.2058 39.0875 39.8005 39.7958 39.9075 40.2175 40.1575 40.2405 39.4930 39.6139 39.6055 39.5944 39.5753 39.5222 39.5228 39.4733 39.5680 39.6258 39.5964 39.6400 39.6436 39.6483 39.6458 39.6828 39.6147 region Hydrologic Mountain Mountain Mountain Mountain Mountain Mountain Northwest Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain S , mean watershed slope, in percent; Drainage-basin and climatic characteristics at streamflow-gaging stations used for regional regression analysis.—Continued

Station number 09041100 09063200 09052400 09052800 09055000 09058610 09058700 09058800 09059500 09060500 09067005 09068000 09069500 09070000 09071300 09073500 09073700 09073800 09073900 09074000 09074800 09035800 09035900 09036500 09039000 09040000 09046530 09047000 09047500 09047700 09050100 09063400 09064500 09065100 09065500 09066000 09066100 09066150 09066200 09066300 09066400 09066500 100-year precipitation, in inches; NA, not applicable, station operated as peak-only or flood-hydrograph station] square miles; Table 1. Table YRSANN, years of record for annual streamflow; YRSPK, years of record for peak streamflow; latitude in decimal degrees; LNGDEG, longitude [LATDEG, 10 Regional Regression Equations for Estimation of Natural Streamflow Statistics in Colorado P 2.3 2.1 2.5 2.2 2.1 2 2.2 2.4 2.4 2.3 2.2 2.4 2.3 2.2 2.2 2.1 2.2 2.1 2.4 2.7 2.6 2.5 2.5 2.5 2.5 2.3 2.3 2.4 2.3 2.2 2.7 2.5 2.3 2.2 2.4 2.3 2.4 2.3 2.3 2.1 2.2 2.2 6 100 , 6-hour, , 6-hour, 7500 97.4 40.7 91.5 65.5 91 64.8 99.5 92.4 97.7 94.7 87.6 90.9 84.6 94.3 A P 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 6 100 A , drainage area, in E 8,732 7,243 8,550 7,972 8,134 7,624 9,365 9,743 9,351 8,622 9,589 9,862 9,606 9,733 9,463 9,168 9,490 9,716 9,661 9,010 9,406 9,894 11,384 11,846 11,598 11,204 10,924 10,647 10,237 10,619 10,975 10,891 10,546 10,103 10,166 10,883 10,336 10,808 10,272 10,202 10,210 10,432 P 29.9 20.2 26.1 22.9 21.2 20.2 31.2 34.3 30.3 26.7 30.9 34.1 26.6 23.9 21.4 18.3 23.4 18.6 44.3 36.1 33.2 31.6 32.6 31.9 29.5 26.8 39.5 34 32.6 27 35.8 34.1 28.9 29.4 38.2 33.6 32 31.7 31.9 27.3 25.6 21.1 A above 7,500 feet elevation plus 1; S 26.5 23.4 33.5 32.4 34.6 42.2 20.4 17.4 17.5 20.6 36.9 21.5 27.3 30.9 31.2 26.3 38.3 24.2 60.2 53.4 48.4 41.0 48.2 38.0 37.7 44.0 49.4 22.1 30.9 30.4 38.1 34.9 40.6 29.0 40.7 36.8 37.8 34.2 32.2 28.6 29.8 26.4 , percentage of 7500 A 9.3 5.3 7.2 6.2 7.9 11.5 64.2 63.4 34.9 22.8 80.4 49.8 35.3 18.9 88.9 10.7 42.3 12.4 27.9 75.4 30.3 23.8 15.8 89.2 68.9 32.9 47.7 A 119.3 137.1 141.5 323.1 143 127.6 477.1 148.3 425.9 106.9 167.3 289.3 339.9 1,059.9 1,010 11 44 15 19 23 22 12 59 15 59 12 20 25 97 56 14 24 70 25 19 19 41 17 17 41 14 52 16 14 15 17 14 13 30 24 14 85 12 25 81 18 NA YRSANN E , mean watershed elevation, in feet; 8 9 9 18 49 14 20 24 23 13 37 15 59 12 24 24 20 55 14 24 68 25 28 15 16 39 14 50 16 14 15 18 15 14 30 12 25 12 76 12 26 78 YRSPK LNGDEG 107.1145 108.1109 107.5801 107.7140 107.6984 107.7634 108.3170 107.8020 107.8406 107.6339 107.8506 107.8423 108.1267 106.5667 106.8453 106.4228 106.7261 106.6364 106.9409 106.9053 106.5314 106.5931 106.6581 106.5684 106.5753 106.6659 106.8206 107.2273 107.3334 107.2245 107.0523 107.4484 107.4348 107.4239 107.8326 106.9098 106.9695 106.8528 106.8481 107.0584 106.9984 106.9498 P , mean annual precipitation, in inches; 39.3311 38.4117 LATDEG 39.5316 39.6778 39.6200 39.4533 39.2236 39.2505 39.2361 39.2722 39.3250 39.0864 38.8603 38.6644 38.8644 38.4972 38.5597 38.5217 38.2914 39.1236 39.2455 39.2417 39.3308 39.3589 39.3342 39.3428 39.3617 39.2322 39.3297 39.3305 39.4667 39.6053 39.6091 39.5978 39.4719 39.5669 38.8697 38.8244 38.6644 38.7655 38.7022 38.5419 region Hydrologic Northwest Northwest Northwest Northwest Mountain Mountain Mountain Mountain Mountain Northwest Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Northwest Mountain Northwest Mountain Northwest Northwest Northwest Mountain Northwest Northwest Mountain Mountain Mountain Mountain Mountain Mountain Mountain S , mean watershed slope, in percent; Station number 09111500 09091100 09110000 09110500 09117000 09118000 09119000 09112000 09112500 09113300 09113500 09114500 09115500 09091500 09092000 09092500 09095000 09096000 09096500 09096800 09097500 09097600 09104500 09107000 09122000 09075700 09077200 09077800 09078000 09078100 09078200 09078500 09080300 09081600 09082800 09083000 09084000 09085200 09085300 09085400 09089500 09093000 100-year precipitation, in inches; NA, not applicable, station operated as peak-only or flood-hydrograph station] square miles; Table 1. Table Drainage-basin and climatic characteristics at streamflow-gaging stations used for regional regression analysis.—Continued YRSANN, years of record for annual streamflow; YRSPK, years of record for peak streamflow; latitude in decimal degrees; LNGDEG, longitude [LATDEG, Regional Regression Equations for Estimation of Natural Streamflow Statistics in Colorado 11 100 P 2.4 2.3 2.4 2.4 2.7 2.3 2 2.3 2.5 2.3 2.1 2.4 2.2 2.4 1.9 2.2 2.5 2.4 2.3 2.3 2.4 2.3 2.3 2.5 2.3 2.5 2.5 2.1 2.5 2.5 2.5 2.4 2.5 2.2 2.2 2.2 2.4 2 2 2 1.8 2.7 6 , 6-hour, , 6-hour, 0 0.8 0.2 7500 100 98.4 97.6 65.4 54.2 99 54.7 73.3 97.3 86.8 87.1 99.5 91.2 99.5 98.1 94.2 58.3 91.4 60.2 44.5 15.2 A P 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 6 A , drainage area, in E 9,468 9,694 7,932 5,836 7,862 9,944 7,645 8,687 8,483 8,986 5,637 9,862 9,674 9,631 9,165 8,694 9,418 8,886 9,723 9,444 9,663 9,969 9,381 9,464 8,034 9,053 9,163 7,839 7,274 6,525 4,980 11,267 11,435 10,215 10,939 10,041 10,884 10,862 10,397 10,153 10,721 10,631 P 9.9 38.1 30.9 35.2 31.8 31.2 21.5 12.9 21.9 32.1 30.3 19.7 26.2 23.7 30.3 13.8 27.4 34.1 28.2 22.7 32.7 20.5 25.6 28.7 29.8 28.5 34 33.5 22.0 32.8 37.7 38.3 33.9 35.7 24.4 25.8 26.3 33.7 18.2 17.4 15.5 36.1 A above 7,500 feet elevation plus 1; S 9.7 11.8 58.4 38.5 50.3 41.1 32.3 27.6 22.7 31.2 37.6 16.1 16.9 22.6 16.0 44.7 46.0 45.9 42.7 38.5 49.6 29.4 43.6 28.9 18.3 33.0 20.9 17.1 28.9 17.4 18.6 16.1 17.3 16.8 17.6 28.1 55.6 15.3 18.3 41.8 15.5 38.2 , percentage of 7500 A 8.2 7.9 1.7 7.3 2.4 5.6 75.2 14.1 16.5 33.4 38.4 53.7 15.4 20.5 58.2 35 67 42.3 43.4 34.7 10.8 12.2 10.5 39.1 97.2 45.6 90.1 A 505.2 147 309.5 120.5 339.2 132.9 525.6 197 102.7 249.1 168.4 105.6 2,028.6 1,068.6 5,247.4 9 5 11 16 15 16 12 23 96 29 41 18 70 18 53 12 70 27 53 18 59 19 10 74 13 29 23 12 12 12 12 82 22 49 18 23 10 54 NA NA NA NA YRSANN E , mean watershed elevation, in feet; 11 16 15 16 12 92 29 12 40 18 70 10 12 53 23 13 24 13 69 27 15 21 58 19 10 72 13 29 24 12 12 12 12 90 23 49 18 13 24 10 15 53 YRSPK LNGDEG 107.6751 107.8512 107.8137 107.9198 108.4976 108.5831 108.8148 108.8854 108.0059 108.1323 108.3629 108.3279 108.5665 109.1098 109.3451 109.2657 107.3167 107.3084 107.2301 107.4151 107.5467 107.5062 107.5067 107.3584 107.5753 107.4342 107.6137 107.7937 107.8378 108.0281 107.9720 107.9437 107.9187 107.9212 107.9953 107.7584 107.6448 108.0459 108.1617 108.9837 109.3368 108.0604 P , mean annual precipitation, in inches; 38.0311 LATDEG 38.0736 38.0933 38.1455 37.8767 38.0258 38.3103 37.9583 38.0425 38.2736 37.9758 38.2178 38.5189 38.7250 38.5928 38.5608 38.0250 38.2989 38.4878 38.2572 38.5519 38.7278 39.0133 39.1308 38.9258 39.0322 38.9264 38.7830 38.9447 38.9836 38.9866 38.9580 38.9016 38.7878 38.1778 38.1494 38.5553 38.7350 39.3086 38.9639 37.6389 37.4725 region Hydrologic Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Mountain Mountain Mountain Mountain Mountain Mountain Northwest Northwest Mountain Northwest Mountain Northwest Northwest Northwest Mountain Mountain Northwest Northwest Northwest Southwest Southwest Mountain Northwest Northwest Northwest Southwest Southwest Southwest S , mean watershed slope, in percent; Drainage-basin and climatic characteristics at streamflow-gaging stations used for regional regression analysis.—Continued

Station number 09146400 09146500 09146600 09168100 09168700 09169500 09172000 09172500 09174500 09175000 09175500 09177500 09181000 09182000 09122500 09123500 09124500 09125000 09126000 09127500 09128500 09130500 09130600 09132500 09132900 09134500 09136200 09137800 09139200 09140200 09141200 09143500 09144200 09146000 09147000 09147100 09149450 09150500 09153400 09163700 09165000 09166500 100-year precipitation, in inches; NA, not applicable, station operated as peak-only or flood-hydrograph station] square miles; Table 1. Table YRSANN, years of record for annual streamflow; YRSPK, years of record for peak streamflow; latitude in decimal degrees; LNGDEG, longitude [LATDEG, 12 Regional Regression Equations for Estimation of Natural Streamflow Statistics in Colorado 100 P 1.7 1.9 2.3 2.3 2.2 2.1 2.2 2.2 2.1 1.8 1.8 2.1 1.9 1.8 2.2 2.1 2.1 2.4 1.7 1.7 1.7 1.7 1.7 1.7 1.7 2.2 2.6 2.4 2.2 2.4 2.1 2.2 2.2 2.3 2.2 2.3 2.3 1.9 1.7 1.7 1.7 1.7 6 , 6-hour, , 6-hour, 0.1 3.2 0 0 1.8 4.7 3.3 0 0 0 0 0 2.9 7500 100 11.7 12.4 12 91.6 85.6 74.8 71.1 70 86.4 37.6 14.1 45.1 31 67.4 98.1 86.3 99.4 73.6 94.5 89 92.3 62.9 97.8 21.8 12.8 A P 100 100 100 100 6 A , drainage area, in E 7,011 9,011 7,042 6,468 8,546 9,573 8,390 7,837 8,001 8,066 6,927 6,988 8,405 5,743 4,807 7,104 6,669 6,586 7,338 6,976 6,982 7,317 6,827 6,654 6,578 8,541 8,139 9,493 8,782 9,106 8,292 8,414 8,461 9,063 7,906 8,707 9,458 7,063 6,566 6,553 6,840 6,653 P 9.5 7.9 9.6 8.5 9.2 8.8 8.6 8.6 8.6 9.9 11.1 11.2 12.6 32.8 48.6 30.5 26.6 27.8 38.1 28.2 13.1 13 31.4 19.9 15 14.2 17.2 10.6 19.3 20.5 47.1 31.5 38.1 26.3 30.7 31.4 33.7 24.3 33.5 47 16.6 10.3 A above 7,500 feet elevation plus 1; S 7.0 7.4 8.7 9.7 7.9 7.6 11.7 11.4 16.7 19.2 22.4 24.1 19.4 15.3 18.6 18.9 18.7 17.6 31.7 14.8 29.6 25.1 32.8 15.1 12.5 34.2 10.2 12.2 15.8 19.9 19.6 21.7 27.3 25.2 20.4 22.7 23.8 21.3 21.0 26.8 15.0 15.9 , percentage of 7500 A 8.4 8.5 5.8 8.1 1.3 3.6 1.3 6.7 11.9 45.9 34.4 63.1 12.7 24.8 51.2 77.1 15.2 12.1 24.9 42.3 34.5 67.7 21.4 63.3 13 A 114.3 115.4 252.7 149.8 332.4 920.5 163 357.9 153 481.9 525.3 567.4 216.5 144.1 414.9 1,010.9 4,035.8 8 9 60 76 36 46 39 86 29 43 21 36 13 99 68 18 43 15 18 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA YRSANN E , mean watershed elevation, in feet; 11 16 24 60 12 76 38 59 10 39 12 14 83 15 31 47 15 22 17 21 22 18 24 17 20 21 10 35 20 99 69 18 44 15 19 34 10 10 15 17 17 20 YRSPK LNGDEG 109.5112 108.1293 107.1434 107.0692 107.3828 107.3819 107.5492 107.4645 107.5217 107.6712 107.6465 107.5151 108.4243 109.6590 109.5798 109.5140 109.4507 109.4401 109.5743 108.7368 108.9423 108.9673 109.3810 109.6229 109.6160 109.6188 109.6801 109.3190 106.7870 106.8323 106.9159 107.1392 107.2851 107.2873 107.3201 107.7323 107.0442 106.9572 109.1340 109.6021 109.6451 109.6101 P , mean annual precipitation, in inches; 41.4111 41.0611 LATDEG 41.6394 41.1322 40.9825 41.0978 41.0283 40.8766 40.9155 41.3400 41.1319 40.8405 40.5486 38.9528 38.6128 38.5622 38.4000 38.2433 38.0625 41.5594 41.6750 41.4569 41.4833 41.5327 41.4597 41.4250 41.0205 40.7680 40.4080 40.4836 40.7175 40.3341 40.6697 40.6805 40.3125 40.1936 40.9905 41.0425 40.9994 40.3000 41.3736 41.1705 region Hydrologic Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Southwest Southwest Southwest Southwest Southwest Southwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Mountain Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest S , mean watershed slope, in percent; Drainage-basin and climatic characteristics at streamflow-gaging stations used for regional regression analysis.—Continued

Station number 09216537 09253400 09255000 09256000 09257000 09257500 09258000 09258200 09258900 09259500 09260000 09182600 09183000 09184000 09185200 09185500 09187000 09216400 09216550 09216600 09216700 09216900 09224810 09224820 09229450 09235600 09238500 09239500 09241000 09244100 09245000 09245500 09249000 09250000 09251500 09251800 09253000 09263700 09224840 09224980 09225200 09225300 100-year precipitation, in inches; NA, not applicable, station operated as peak-only or flood-hydrograph station] square miles; Table 1. Table YRSANN, years of record for annual streamflow; YRSPK, years of record for peak streamflow; latitude in decimal degrees; LNGDEG, longitude [LATDEG, Regional Regression Equations for Estimation of Natural Streamflow Statistics in Colorado 13 100 P 2.7 2.6 2.1 2 2 1.9 2 2.2 2.9 2 2 3.1 3 3.1 3.1 3.1 3 3.1 2.8 3 1.8 2.6 2.7 2.5 2.7 2.6 2.5 1.9 2.4 2.4 2.5 2.4 2.7 2.8 2.5 2.4 2.1 2 2 2 2 2 6 , 6-hour, , 6-hour, 0.4 0 0 0 0 7500 100 45.1 78 49.6 17.7 32.3 63.2 35.5 96.1 99.1 96.7 86.6 12.9 66.2 98 97.5 84 57.6 23.8 48.9 A P 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 6 A , drainage area, in E 7,112 6,110 9,832 7,419 7,876 7,542 6,878 7,157 7,772 9,608 9,890 9,738 9,264 5,379 9,929 9,452 9,279 6,542 8,833 8,971 9,814 9,551 9,852 8,938 7,634 6,933 6,744 6,671 7,213 7,473 11,081 10,138 10,030 10,235 10,071 10,380 10,026 10,255 10,480 10,353 10,585 10,667 P 9.2 30.9 30.5 29.5 18.7 20.5 19.2 16.7 15.9 17.5 33.2 15.1 12.1 43 41.5 51 45 39.9 38.8 39.2 33.1 40.1 29.2 32.2 27.4 31.8 26.7 12.7 23.1 30.3 37.8 35.5 42.1 41.8 36.9 30.9 19.9 16.7 16.4 16.5 17.3 18.1 A above 7,500 feet elevation plus 1; S 24.5 18.0 19.1 27.9 28.3 24.2 19.5 29.2 37.6 26.0 28.5 37.8 44.4 45.7 46.9 43.3 40.2 38.9 46.7 32.5 43.3 10.1 10.1 18.2 20.7 20.8 24.7 20.8 21.6 21.8 25.8 25.2 21.5 14.2 27.2 24.9 32.7 14.3 13.8 15.4 19.5 28.8 , percentage of 7500 A 8.8 7.5 9.2 9.4 4.3 7.4 3.6 1.2 1.1 7.9 A 10.4 31.7 13.4 22.9 65.4 90.8 39.9 85.6 24 57.9 23.1 69.2 26.6 19.9 44.6 21.6 59.9 52.2 48.3 116.2 505.8 262.5 323.3 300 902.7 280.8 101.5 544.6 259.4 176.5 760.3 177.3 9 11 11 11 11 11 43 29 17 42 33 29 19 27 25 17 45 45 16 28 12 72 36 17 59 12 92 36 35 22 25 12 56 20 14 47 24 16 NA NA NA 103 YRSANN E , mean watershed elevation, in feet; 8 11 11 11 11 11 44 29 18 41 33 28 19 27 26 10 45 46 17 29 13 75 37 18 41 14 12 94 37 35 15 28 25 12 50 20 14 46 98 25 12 18 YRSPK LNGDEG 106.8111 109.8110 109.7510 109.7618 108.2976 108.5284 108.4729 108.4012 109.3548 109.5874 109.6485 109.8212 106.8412 106.8923 106.9303 106.9073 106.9403 107.0078 106.7945 106.9053 106.6895 109.2173 109.6785 109.7035 109.6221 109.8201 109.6057 109.7507 109.8532 107.4689 107.4881 107.6145 107.3348 107.3367 107.6253 107.8623 108.1831 108.1993 108.2076 108.2206 108.2437 108.2443 P , mean annual precipitation, in inches; 39.9211 LATDEG 40.6594 40.6500 39.8883 39.9203 40.1686 39.7533 39.5664 39.9389 38.9422 37.3897 37.3695 37.4856 37.3920 37.3695 37.2667 37.2128 37.1936 37.0853 37.0756 40.3166 40.7333 40.7333 40.5775 40.6263 40.6427 40.5263 40.4166 40.3019 40.0503 40.0383 39.9875 39.8433 39.8428 39.9744 40.0336 39.8261 39.8250 39.8266 39.8336 39.8141 39.8372 region Hydrologic Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Mountain Mountain Northwest Mountain Mountain Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest S , mean watershed slope, in percent; Drainage-basin and climatic characteristics at streamflow-gaging stations used for regional regression analysis.—Continued

Station number 09268900 09269000 09306240 09306242 09306255 09306800 09307500 09308000 09328900 09339900 09340000 09340500 09341500 09342000 09342500 09343000 09343500 09344000 09345200 09263800 09264000 09264500 09266500 09268000 09268500 09270500 09271800 09300500 09302450 09302500 09303000 09303300 09303320 09304000 09304500 09306007 09306036 09306039 09306042 09306052 09306058 09306200 100-year precipitation, in inches; NA, not applicable, station operated as peak-only or flood-hydrograph station] square miles; Table 1. Table YRSANN, years of record for annual streamflow; YRSPK, years of record for peak streamflow; latitude in decimal degrees; LNGDEG, longitude [LATDEG, 14 Regional Regression Equations for Estimation of Natural Streamflow Statistics in Colorado 100 P 2.4 2.4 2 1.9 1.9 2 2.2 2 2 2.8 2.7 2 2.7 2.3 2.3 2.2 2.7 2.7 2.6 2.4 2.2 2.2 2.1 2.8 2.5 3 2.7 2.5 3.5 2.1 2.1 2 2.7 2.7 2.8 2.8 3.1 2.9 2.7 3.5 2.2 3 6 , 6-hour, , 6-hour, 0 0 0 0 4.5 0 0 0 7.8 3.4 5.5 0 0 0 0 0 7500 100 59.6 39.5 99.9 28.8 91.4 93.6 58.4 21.7 95.4 67.1 78.5 32.5 20.6 98.7 97.5 93.5 68.7 99.4 A P 100 100 100 100 100 100 100 100 6 A , drainage area, in E 7,835 7,605 5,650 5,503 5,468 5,776 6,328 5,227 5,334 9,705 9,690 5,383 9,388 7,216 6,856 6,407 8,621 8,680 7,917 6,807 5,861 5,905 5,826 9,180 7,637 8,564 7,394 6,940 6,934 5,958 9,592 9,413 8,174 9,999 6,762 11,350 11,936 11,445 11,571 10,137 10,146 10,228 P 9.8 9.2 9 9.9 7.9 8.8 8.6 8.3 8.9 9.6 21.4 20.3 10.7 33.4 33.1 31 19 17.3 14.9 26.8 26.3 22.5 15.4 10.6 31.4 20.9 37.8 27.2 18 39.5 17.4 10.5 44.7 40.5 41.2 33.7 34.1 35.9 24.8 34.4 16.9 39.8 A above 7,500 feet elevation plus 1; S 7.6 6.6 7.3 3.5 6.1 3.3 9.9 6.8 23.3 18.0 15.3 13.0 26.3 43.0 21.1 25.3 26.4 22.6 15.5 27.7 35.7 26.1 28.9 22.8 12.3 32.3 18.1 41.9 29.3 18.2 57.9 16.7 14.4 54.4 54.5 51.9 46.7 53.9 46.6 33.0 34.1 49.2 , percentage of 7500 A 1.1 3 4.6 2.1 4.5 8.4 3.8 1.3 0.2 0.3 75.6 21.7 39.5 12.1 64.4 12.1 37.4 76.9 82.6 60.2 72.5 58.3 57.6 20.1 44.4 25.5 63.2 97.4 17.8 33.4 A 309.3 136.3 526.7 347.5 205 278.9 176 129.5 624.9 168.4 709.6 4,390.7 4 9 6 22 87 15 18 15 14 13 78 56 22 42 18 23 71 13 45 45 56 47 15 13 48 95 22 42 23 90 NA NA NA NA NA NA NA NA NA NA NA NA YRSANN E , mean watershed elevation, in feet; 11 23 86 27 35 21 16 30 17 21 16 15 15 72 56 21 41 17 29 10 15 14 15 36 39 14 44 49 43 56 35 21 47 14 14 50 20 83 22 45 23 92 YRSPK LNGDEG 108.1987 108.1887 108.2259 108.3006 108.3701 108.4412 108.5915 108.7262 108.7250 108.2581 108.2315 108.2306 108.7415 108.4829 109.0157 109.3696 109.4765 109.4626 109.5787 109.6757 109.6243 109.4062 109.8173 106.9075 107.0006 107.1934 107.3978 107.2797 107.5437 107.5970 107.9173 108.1848 107.5995 107.6637 107.6953 107.8451 107.9095 107.8803 107.8937 107.7490 107.7534 108.0406 P , mean annual precipitation, in inches; 37.0111 37.1189 LATDEG 36.9997 36.7861 36.7333 36.7667 36.7733 36.7244 36.7706 36.9258 37.3817 37.3703 37.3739 37.0275 37.3475 37.3242 37.8467 37.7556 37.6808 37.5606 37.2661 36.3333 36.4694 37.2167 37.0028 36.9333 37.4286 37.0883 36.7231 37.4775 36.4667 36.5900 37.8331 37.8197 37.7975 37.4219 37.3342 37.2792 37.6039 37.3253 37.1397 37.2897 region Hydrologic Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest S , mean watershed slope, in percent; Drainage-basin and climatic characteristics at streamflow-gaging stations used for regional regression analysis.—Continued

Station number 09366500 09367400 09367530 09367550 09367561 09367950 09367980 09368020 09368500 09369000 09369500 09371000 09371300 09372000 09378170 09378630 09378650 09378700 09379000 09379030 09379060 09379300 09346000 09346200 09347500 09349800 09350800 09352900 09355000 09357200 09357230 09357500 09358550 09359000 09361000 09361400 09361500 09362000 09363000 09363100 09365500 09366000 100-year precipitation, in inches; NA, not applicable, station operated as peak-only or flood-hydrograph station] square miles; Table 1. Table YRSANN, years of record for annual streamflow; YRSPK, years of record for peak streamflow; latitude in decimal degrees; LNGDEG, longitude [LATDEG, Supplemental Information 35 ------X X X X X X X X X X X X X X X X X X Flow duration ------X X X X X X X X X X X X X X X X X X X X X Monthly Mean flow , maximum 7-day, 50-year , maximum 7-day, ------X X X X X X X X X X X X X X X X X X X X X 50 Q 7 Annual 50 ------X X X X X X X X X X X X X Q 7 10 ------X X X X X X X X X X X X X X X Q 7 Minimum 2 Q ------X X X X X X X X X X X X X X X X 7 Streamflow characteristic 50 ------X X X X X X X X X X X X X X X X X X X Q 7 , maximum 7-day, 10-year flow; Maximum , maximum 7-day, 10 10 ------X X X X X X X X X X X X X X X X X X X Q 7 Q 7 Maximum 2 Q ------X X X X X X X X X X X X X X X X X X X 7 , minimum 7-day, 50-year flow; Flow duration, 10-, 25-, 50-, 75-, and 90-percent flow duration; , minimum 7-day, 50 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Q flow 7 Peak (fig. 1) region Hydrologic Mountain Northwest Mountain Mountain Mountain Mountain Plains Northwest Mountain Plains Northwest Plains Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Plains Mountain Mountain Mountain Plains Mountain Mountain Mountain Plains Mountain Mountain Mountain Plains Mountain Mountain , maximum 7-day, 2-year flow; Maximum , maximum 7-day, 2 Q 7

, minimum 7-day, 10-year flow; Minimum , minimum 7-day, 10 Q 7 Station name , minimum 7-day, 2-year flow; Minimum , minimum 7-day, at Grant, CO Encampment, WY Encampment, 2 Q Cub Creek at Evergreen, CO Cub Creek at Evergreen, Medicine Bow River near Medicine Bow, WY Medicine Bow River near Bow, Middle St. Vrain Creek near Allens Park, CO Creek near Vrain Middle St. Bear Creek above Evergreen, CO Bear Creek above Evergreen, Bear Creek near Elk Mountain, WY Bear Creek near Elk Mountain, South St. Vrain Creek near Ward, CO Ward, Creek near Vrain South St. Plum Creek near Louviers, CO Rattlesnake Creek near Walcott, WY Walcott, Rattlesnake Creek near North St. Vrain Creek near Allens Park, CO Creek near Vrain North St. North Fork South Platte River at Platte, CO Jack Creek at Matheson Ranch near Saratoga, WY Jack Creek at Matheson Ranch near Saratoga, Clear Creek near Golden, CO North Fork South Platte River below Geneva Creek, Encampment River at Encampment, WY Encampment River at Encampment, Chicago Creek below Devils Canyon near Idaho Sprgs CO Chicago Creek below Devils Canyon near Idaho Sprgs Douglas Creek above Keystone, WY Douglas Creek above Keystone, Goose Creek above Cheesman Lake, CO Encampment River above Hog Park Creek, near near Creek, Park Hog above River Encampment Clear Creek near Lawson, CO Michigan River near Cowdrey, CO Michigan River near Cowdrey, Tarryall Creek below Rock Creek near Jefferson, CO Creek below Rock near Jefferson, Tarryall North Brush Creek near Saratoga, WY North Brush Creek near Saratoga, Cherry Creek near Franktown, CO Illinois Creek at Walden, CO Walden, Illinois Creek at Tarryall Creek at Upper Station near Como, CO Tarryall French Creek near French, WY French Creek near French, Turkey Creek near Morrison, CO Turkey Michigan River at Walden, CO Walden, Michigan River at Rock Creek above King Canyon Canal, near Arlington, WY Arlington, Rock Creek above King Canyon Canal, near Big Creek at Big Creek Ranger Station, WY Big Creek at Ranger Station, Parmalee Gulch at Mouth, Indian Hills, CO North Fork Michigan River near Gould, CO Wagonhound Creek near Elk Mountain, WY Creek near Elk Mountain, Wagonhound Douglas Creek near Foxpark, WY Douglas Creek near Foxpark, Mount Vernon Creek near Morrison, CO Vernon Mount Middle Boulder Creek at Nederland, CO Michigan River near Cameron Pass, CO 7 Streamflow-gaging stations used in the development of regional streamflow regression equations.—Continued

Station number 06711000 06631100 06710400 06631000 06723000 06710385 06630800 06722500 06709500 06629100 06721500 06707000 06627500 06719500 06706000 06624500 06717400 06620400 06700500 06623800 06716500 06619000 06699005 06622700 06712000 06618500 06696980 06622500 06617100 06632400 06622000 06710990 06616000 06621000 06710600 06725500 06614800 X, station used in the development of regional regression equation for indicated streamflow characteristic and hydrologic region; --, not the indicated streamflow characteristic and hydrologic region] Table 4. Table 2-, 5-, 10-, 25-, 50-, 100-, 200-, and 500-year peak flow; Maximum [Peak flow, flow; Minimum 36 Regional Regression Equations for Estimation of Natural Streamflow Statistics in Colorado ------X X X X X X X X X X Flow duration ------X X X X X X X X X X X Monthly Mean flow , maximum 7-day, 50-year , maximum 7-day, ------X X X X X X X X X X X 50 Q 7 Annual 50 ------X X X X X X X X X X Q 7 10 ------X X X X X X X X X X Q 7 Minimum 2 Q ------X X X X X X X X X X 7 Streamflow characteristic 50 ------X X X X X X X X X X Q 7 , maximum 7-day, 10-year flow; Maximum , maximum 7-day, 10 10 ------X X X X X X X X X X Q 7 Q 7 Maximum 2 Q ------X X X X X X X X X X 7 , minimum 7-day, 50-year flow; Flow duration, 10-, 25-, 50-, 75-, and 90-percent flow duration; , minimum 7-day, 50 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Q flow 7 Peak (fig. 1) region Hydrologic Plains Plains Mountain Plains Plains Mountain Plains Plains Mountain Plains Plains Plains Plains Plains Mountain Plains Plains Plains Plains Plains Plains Mountain Mountain Plains Mountain Mountain Plains Plains Mountain Mountain Mountain Plains Plains Mountain Mountain Plains Plains Plains , maximum 7-day, 2-year flow; Maximum , maximum 7-day, 2 Q 7 , minimum 7-day, 10-year flow; Minimum , minimum 7-day, 10 Q 7 Station name , minimum 7-day, 2-year flow; Minimum , minimum 7-day, Fort Carson, CO 2 Q Lodgepole Creek Tributary No. 2 near Albin, WY Albin, No. 2 near Tributary Lodgepole Creek Little Fountain Creek above Keaton Reservoir, near Little Fountain Creek above Keaton Reservoir, Lake Fork above Sugar Loaf Reservoir, CO Lake Fork above Sugar Loaf Reservoir, Lodgepole Creek at Bushnell, Nebr. Turkey Creek above Teller Reservoir near Stone City, CO Reservoir near Stone City, Teller Creek above Turkey Tennessee Creek near Leadville, CO Tennessee Lodgepole Creek Tributary near Pine Bluffs, WY near Pine Bluffs, Tributary Lodgepole Creek Beaver Creek near Portland, CO East Fork Arkansas River near Leadville, CO East Fork Middle Bijou Creek Tributary near Deer Trail, CO Trail, near Deer Tributary Middle Bijou Creek Fourmile Creek near Canon City, CO Fourmile Creek near Canon City, North Fork Smoky Hill River near Mcallaster, KS North Fork Smoky Hill River near Mcallaster, Kiowa Creek Tributary near Bennett, CO Tributary Kiowa Creek Grape Creek near Westcliffe, CO Westcliffe, Grape Creek near Fall Creek near Rustic, CO South Fork Sappa Creek Tributary near Goodland, KS Tributary South Fork Sappa Creek Kiowa Creek at Kiowa, CO Badger Creek, Lower Station, near Howard, CO Buckhorn Creek near Masonville, CO South Fork Sappa Creek near Brewster, KS South Fork Sappa Creek near Brewster, South Crow Creek near Hecla, WY South Crow Creek near Hecla, South Arkansas River near Salida, CO South Glacier Creek near Estes Park, CO Landsman Creek near Hale, CO South Fork Cache La Poudre River near Rustic, CO Chalk Creek near Nathrop, CO Coal Creek near Plainview, CO Coal Creek near Plainview, Buffalo Creek near Haigler, NE Creek near Haigler, Buffalo Little Beaver Creek near Rustic, CO Cottonwood C below Hot Springs, near Buena Vista, CO Vista, Cottonwood C below Hot Springs, near Buena South Boulder Creek near Rollinsville, CO North Fork Black Wolf Creek near Vernon, CO Vernon, Creek near Wolf North Fork Black St. Charles River at Burnt Mill, CO Little Beaver Creek near Idylwilde, CO Halfmoon Creek near Malta, CO Bummers Gulch near El Vado, CO Vado, Bummers Gulch near El North Fork Arikaree River Tributary near Shaw, CO near Shaw, Tributary Arikaree River North Fork Rock Creek above Fort Carson Reservation, CO 7 Streamflow-gaging stations used in the development of regional streamflow regression equations.—Continued

Station number 07105945 06762600 07105920 07082000 06762500 07099230 07081000 06761900 07099100 07079500 06758700 07096500 06858500 06758250 07095000 06748200 06844800 06758200 07093775 06739500 06844700 06755000 07093500 06732000 06825500 06748600 07091000 06730300 06823500 06748530 07089000 06729000 06821400 07107500 06748510 07083000 06726900 06821300 X, station used in the development of regional regression equation for indicated streamflow characteristic and hydrologic region; --, not the indicated streamflow characteristic and hydrologic region] Table 4. Table 2-, 5-, 10-, 25-, 50-, 100-, 200-, and 500-year peak flow; Maximum [Peak flow, flow; Minimum Supplemental Information 37 ------Flow duration ------Monthly Mean flow , maximum 7-day, 50-year , maximum 7-day, ------50 Q 7 Annual 50 ------Q 7 10 ------Q 7 Minimum 2 Q ------7 Streamflow characteristic 50 ------Q 7 , maximum 7-day, 10-year flow; Maximum , maximum 7-day, 10 10 ------Q 7 Q 7 Maximum 2 Q ------7 , minimum 7-day, 50-year flow; Flow duration, 10-, 25-, 50-, 75-, and 90-percent flow duration; , minimum 7-day, 50 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Q flow 7 Peak (fig. 1) region Hydrologic Plains Plains Plains Plains RioGrande Plains Plains RioGrande Plains Plains RioGrande Plains Plains RioGrande Plains Plains Plains Plains Plains Plains Plains Plains Plains Plains Plains Plains Plains Plains Plains Plains Plains Plains Plains Plains Plains Plains RioGrande Plains Plains , maximum 7-day, 2-year flow; Maximum , maximum 7-day, 2 Q 7 , minimum 7-day, 10-year flow; Minimum , minimum 7-day, 10 Q 7 Station name , minimum 7-day, 2-year flow; Minimum , minimum 7-day, 2 Q Rayado Creek near Cimarron, NM White Woman C Tributary near Selkirk, KS Tributary C Woman White Ponil Creek near Cimarron, NM Bear Creek near Johnson, KS Clay Creek Tributary near Deora, CO Tributary Clay Creek Clear C near Ute Park, NM Sand Arroyo Creek near Johnson, KS Sand Bent Canyon Creek at Mouth near Timpas, CO Timpas, Bent Canyon Creek at Mouth near Sixmile Creek near Eagle Nest, NM North Fork Cimarron River at Richfield, KS Chacuaco Creek at Mouth near Timpas, CO Timpas, Chacuaco Creek at Mouth near Cieneguilla Cr near Eagle Nest, NM North Fork Cimarron River Tributary near Elkhart, KS Tributary North Fork Cimarron River Red Rock Canyon Creek at Mouth near Thatcher, CO Thatcher, Red Rock Canyon Creek at Mouth near Moreno Creek at Eagle Nest, NM Frijole Creek near Alfalfa, CO Frijole Creek near Cimarron River near Elkhart, KS Lockwood Canyon Creek near Thatcher, CO Thatcher, Lockwood Canyon Creek near Vermejo River near Dawson, NM Vermejo Long Canyon Creek near Madrid, CO Cpld Springs Creek near Wheeless, OK Cpld Springs Creek near Taylor Arroyo below Rock Crossing, near Thatcher, CO Thatcher, Arroyo below Rock Crossing, near Taylor Chicorica Cr Tributary near Raton, NM Tributary Chicorica Cr Timpas Creek at Mouth near Swink, CO Timpas Tesesquite Creek near Kenton, OK Tesesquite Van Bremer Arroyo near Model, CO Bremer Van Raton Creek at Raton, NM Big Arroyo near Thatcher, CO Thatcher, Arroyo near Big Carrizozo Creek near Kenton, OK Ute Creek near Gladstone, NM Luning Arroyo near Model, CO Luning Canadian River near Hebron, NM Apishapa River near Aguilar, CO Aguilar, Apishapa River near Dry Cimarron R near Guy, NM Dry Cimarron R near Guy, Cimarron River at Springer, NM Cimarron River at Springer, San Francisco Creek near Alfalfa, CO San Francisco Creek near Cimarron River Tributary near Moscow, KS near Moscow, Tributary Cimarron River Cucharas River at Boyd Ranch, near La Veta, CO Veta, Cucharas River at Boyd Ranch, near La White Woman C near Leoti, KS Woman White 7 Streamflow-gaging stations used in the development of regional streamflow regression equations.—Continued

Station number 07118000 07211000 07114000 07208500 07138600 07207500 07156220 07133200 07206400 07156100 07126480 07205000 07156010 07126470 07204500 07155900 07126415 07204000 07125100 07155590 07126390 07203000 07124300 07155100 07126325 07201200 07121500 07154650 07126200 07201000 07120620 07154400 07225500 07126100 07199000 07153500 07125500 07156600 07138650 X, station used in the development of regional regression equation for indicated streamflow characteristic and hydrologic region; --, not the indicated streamflow characteristic and hydrologic region] Table 4. Table 2-, 5-, 10-, 25-, 50-, 100-, 200-, and 500-year peak flow; Maximum [Peak flow, flow; Minimum 38 Regional Regression Equations for Estimation of Natural Streamflow Statistics in Colorado ------X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Flow duration ------X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Monthly Mean flow , maximum 7-day, 50-year , maximum 7-day, ------X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 50 Q 7 Annual 50 ------X X X X X X X X X X X X X X X X X X X X X X Q 7 10 ------X X X X X X X X X X X X X X X X X X X X X X X X X Q 7 Minimum 2 Q ------X X X X X X X X X X X X X X X X X X X X X X X X X X 7 Streamflow characteristic 50 ------X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Q 7 , maximum 7-day, 10-year flow; Maximum , maximum 7-day, 10 10 ------X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Q 7 Q 7 Maximum 2 Q ------X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 7 , minimum 7-day, 50-year flow; Flow duration, 10-, 25-, 50-, 75-, and 90-percent flow duration; , minimum 7-day, 50 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Q flow 7 Peak (fig. 1) region Hydrologic RioGrande RioGrande RioGrande RioGrande RioGrande RioGrande RioGrande RioGrande RioGrande RioGrande RioGrande RioGrande RioGrande RioGrande RioGrande RioGrande RioGrande RioGrande RioGrande RioGrande RioGrande RioGrande RioGrande RioGrande RioGrande RioGrande Plains RioGrande RioGrande RioGrande RioGrande Plains RioGrande RioGrande RioGrande RioGrande Plains RioGrande RioGrande , maximum 7-day, 2-year flow; Maximum , maximum 7-day, 2 Q 7 , minimum 7-day, 10-year flow; Minimum , minimum 7-day, 10 Q 7 Station name , minimum 7-day, 2-year flow; Minimum , minimum 7-day, 2 Q Rito De Tierra Amarilla at Tierra Amar, NM Amar, Tierra Amarilla at Tierra Rito De Sangre De Cristo Creek near Fort Garland, CO Wolf Creek near Chama, NM Wolf Ute Creek near Amalia, NM Ute Creek near Trinchera C above Turners Ranch, Nr Ft Garland, CO Turners C above Trinchera Rio Chiquito near Talpa, NM Talpa, Rio Chiquito near Santistevan Creek near Costilla, NM Alamosa River above Terrace Reservoir, CO Reservoir, Terrace Alamosa River above Rio Grande Del Rancho near Talpa, NM Talpa, Rio Grande Del Rancho near Casias Creek near Costilla, NM La Garita Creek near Garita, CO Rio Fernando De Taos near Taos, NM Taos, near Taos Rio Fernando De Costilla Creek above Dam, NM Carnero Creek near La Garita, CO Rio Pueblo De Taos near Taos, NM Taos, near Taos Rio Pueblo De South Fork Rio Grande at Fork, CO San Antonio River at Mouth, near Manassa, CO San North Crestone Creek near Crestone, CO Arroyo Hondo at Arroyo Hondo, NM Arroyo Hondo at Goose Creek at Wagonwheel Gap, CO Wagonwheel Goose Creek at Los Pinos River near Ortiz, CO Saguache Creek near Saguache, CO Rio Hondo near Valdez, NM Valdez, Rio Hondo near Willow Creek at Creede, CO Willow San Antonio River at Ortiz, CO San Kerber Cr above Little Kerber Cr near Villa Grove, CO Villa Kerber Cr above Little near Red River near Questa, NM Aqua Frio Creek near Felt, OK Conejos River near Mogote, CO Willow Creek near Park View, NM View, Creek near Park Willow Rock Creek near Monte Vista, CO Vista, Rock Creek near Monte Red River near Red River, NM Red River near River, Beaver River near Guymon, OK Conejos River at Platoro, CO Rio Chama near La Puente, NM Pinos Creek near Del Norte, CO Latir Creek near Cerro, NM Sandy Arroyo Tributary near Clayton, NM Tributary Arroyo Sandy Ute Creek near Fort Garland, CO 7 Streamflow-gaging stations used in the development of regional streamflow regression equations.—Continued

Station number 08284000 08241500 08281200 08255000 08240500 08275600 08253500 08236000 08275500 08253000 08231000 08275000 08252500 08230500 08269000 08219500 08248500 08227500 08268500 08218500 08248000 08227000 08267500 08216500 08247500 08224500 08265000 07232650 08246500 08284500 08223500 08264000 07232500 08245500 08284100 08220500 08263000 07227295 08242500 X, station used in the development of regional regression equation for indicated streamflow characteristic and hydrologic region; --, not the indicated streamflow characteristic and hydrologic region] Table 4. Table 2-, 5-, 10-, 25-, 50-, 100-, 200-, and 500-year peak flow; Maximum [Peak flow, flow; Minimum Supplemental Information 39 -- X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Flow duration -- X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Monthly Mean flow , maximum 7-day, 50-year , maximum 7-day, -- X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 50 Q 7 Annual 50 ------X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Q 7 10 ------X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Q 7 Minimum 2 Q -- -- X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 7 Streamflow characteristic 50 -- X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Q 7 , maximum 7-day, 10-year flow; Maximum , maximum 7-day, 10 10 -- X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Q 7 Q 7 Maximum 2 Q -- X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 7 , minimum 7-day, 50-year flow; Flow duration, 10-, 25-, 50-, 75-, and 90-percent flow duration; , minimum 7-day, 50 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Q flow 7 Peak (fig. 1) region Hydrologic Mountain Mountain Mountain Mountain Northwest Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain Mountain RioGrande Mountain Mountain Mountain Mountain RioGrande Mountain Mountain Mountain Mountain RioGrande Mountain Mountain , maximum 7-day, 2-year flow; Maximum , maximum 7-day, 2 Q 7 , minimum 7-day, 10-year flow; Minimum , minimum 7-day, 10 Q 7 Station name , minimum 7-day, 2-year flow; Minimum , minimum 7-day, 2 Q Wearyman Creek near Red Cliff, CO Creek near Red Cliff, Wearyman Williams Fork below Steelman Creek, CO Williams Rock Creek near Toponas, CO Toponas, Rock Creek near Snake River near Montezuma, CO Bobtail Creek near Jones Pass, CO Piney River near State Bridge, CO Blue River at Dillon, CO Colorado River at Hot Sulphur Springs, CO East Meadow Creek near Minturn CO French Gulch at Breckenridge, CO Fraser River at Granby, CO Fraser River at Granby, Freeman Creek near Minturn, CO Antelope Creek near Kremmling, CO Strawberry Creek near Granby, CO Strawberry Creek near Granby, Dickson Creek near Vail, CO Vail, Dickson Creek near Willow Creek near Granby, CO Creek near Granby, Willow East Fork Troublesome Creek near Troublesome, CO Troublesome, Creek near Troublesome East Fork Meadow Creek near Tabernash, CO Tabernash, Meadow Creek near Otter Creek above Green Mountain Reservoir, CO Otter Creek above Green Mountain Reservoir, Arapaho Creek at Monarch Lake Outlet, CO Troublesome Creek near Pearmont, CO Troublesome Ranch Creek near Tabernash, CO Tabernash, Ranch Creek near Slate Creek at Upper Station, near Dillon, CO North Inlet at Grand Lake, CO Keyser Creek near Leal, CO Ranch Creek near Fraser, CO Ranch Creek near Fraser, Boulder Creek at Upper Station, near Dillon, CO Rio Ojo Caliente at La Madera, NM South Fork of Williams Fork near Leal, CO Williams South Fork of Homestake Creek near Red Cliff, CO Homestake Creek near Red Cliff, St. Louis Creek near Fraser, CO St. Louis Creek near Fraser, Ten Mile Creek below North Ten Mile Creek, at Frisco, CO Ten Mile Creek below North Ten El Rito near Rito, NM Darling Creek near Leal, CO Turkey Creek near Red Cliff, CO Creek near Red Cliff, Turkey Fraser River at Winter Park, CO Winter Fraser River at Keystone Gulch near Dillon, CO Canjilon Creek above Abiquiu Reservoir, NM Abiquiu Reservoir, Canjilon Creek above Williams Fork above Darling Creek, Nr Leal, CO Williams 7 Streamflow-gaging stations used in the development of regional streamflow regression equations.—Continued

Station number 09041100 09063200 09035500 09060500 09047500 09034900 09059500 09047000 09034500 09058800 09046530 09034000 09058700 09033500 09058610 09020000 09040000 09033000 09055000 09016500 09039000 09032500 09052800 09012500 09036500 09032000 09052400 08289000 09035900 09064500 09026500 09050100 08288000 09035800 09063400 09024000 09047700 08286650 09035700 X, station used in the development of regional regression equation for indicated streamflow characteristic and hydrologic region; --, not the indicated streamflow characteristic and hydrologic region] Table 4. Table 2-, 5-, 10-, 25-, 50-, 100-, 200-, and 500-year peak flow; Maximum [Peak flow, flow; Minimum 40 Regional Regression Equations for Estimation of Natural Streamflow Statistics in Colorado -- X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Flow duration -- X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Monthly Mean flow , maximum 7-day, 50-year , maximum 7-day, -- X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 50 Q 7 Annual 50 ------X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Q 7 10 ------X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Q 7 Minimum 2 Q -- X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 7 Streamflow characteristic 50 -- X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Q 7 , maximum 7-day, 10-year flow; Maximum , maximum 7-day, 10 10 -- X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Q 7 Q 7 Maximum 2 Q -- X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 7 , minimum 7-day, 50-year flow; Flow duration, 10-, 25-, 50-, 75-, and 90-percent flow duration; , minimum 7-day, 50 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Q flow 7 Peak (fig. 1) region Hydrologic Mountain Mountain Mountain Northwest Mountain Mountain Northwest Mountain Mountain Northwest Mountain Mountain Mountain Mountain Mountain Mountain Northwest Mountain Mountain Mountain Mountain Mountain Mountain Mountain Northwest Mountain Mountain Mountain Mountain Mountain Mountain Mountain Northwest Mountain Mountain Mountain Mountain Northwest , maximum 7-day, 2-year flow; Maximum , maximum 7-day, 2 Q

7 , minimum 7-day, 10-year flow; Minimum , minimum 7-day, 10 Q 7 Station name , minimum 7-day, 2-year flow; Minimum , minimum 7-day, Norrie, CO 2 Q West Divide Creek near Raven, CO West Hunter Creek above Midway Creek, near Aspen, CO Hunter Creek above Midway Creek, near Cunningham Creek near Norrie, CO Possum Creek near New Castle, CO Roaring Fork River at Aspen, CO Roaring Fork River at North Fork Fryingpan River above Cunningham C, near East Canyon Creek near New Castle, CO Grizzly Creek near Glenwood Springs, CO Fryingpan River at Norrie, CO Canyon Creek above New Castle, CO Eagle River below Gypsum, CO South Fork Fryingpan River at Upper Station, near Norrie, CO CO Norrie, near Station, Upper at River Fryingpan Fork South Cattle Creek near Carbondale, CO Gypsum Creek near Gypsum, CO Fryingpan River near Ivanhoe Lake, CO Booth Creek near Minturn, CO Thompson Creek near Carbondale, CO Brush Creek near Eagle, CO Maroon Creek Above Aspen, CO Above Maroon Creek Pitkin Creek near Minturn, CO North Thompson Creek near Carbondale, CO North Eagle River at Avon, CO Avon, Eagle River at Castle Creek Above Aspen, CO Above Castle Creek Bighorn Creek near Minturn, CO Crystal River above Avalanche Creek, near Redstone, CO Avalanche Crystal River above Gore Creek near Minturn, CO Hunter Creek near Aspen, CO Hunter Creek near Black Gore Creek near Minturn, CO Rocky Fork Creek near Meredith, CO Red Sandstone Creek near Minturn, CO No Name Creek near Aspen, CO No Name Creek near Gore Creek at Upper Station, near Minturn, CO East Rifle Creek near Rifle, CO North Fork Fryingpan River near Norrie, CO Middle Creek near Minturn, CO Midway Creek near Aspen, CO Midway Creek near Cross Creek near Minturn, CO Mamm Creek near Silt, CO 7 Streamflow-gaging stations used in the development of regional streamflow regression equations.—Continued

Station number 09091100 09089500 09073700 09078200 09085400 09073500 09078100 09085300 09071300 09078000 09085200 09070000 09077800 09084000 09069500 09077200 09066200 09083000 09068000 09075700 09066150 09082800 09067005 09074800 09066100 09081600 09066500 09074000 09066000 09080300 09066400 09073900 09065500 09091500 09078500 09066300 09073800 09065100 X, station used in the development of regional regression equation for indicated streamflow characteristic and hydrologic region; --, not the indicated streamflow characteristic and hydrologic region] Table 4. Table 2-, 5-, 10-, 25-, 50-, 100-, 200-, and 500-year peak flow; Maximum [Peak flow, flow; Minimum Supplemental Information 41 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Flow duration X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Monthly Mean flow , maximum 7-day, 50-year , maximum 7-day, X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 50 Q 7 Annual 50 ------X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Q 7 10 -- -- X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Q 7 Minimum 2 Q -- X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 7 Streamflow characteristic 50 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Q 7 , maximum 7-day, 10-year flow; Maximum , maximum 7-day, 10 10 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Q 7 Q 7 Maximum 2 Q X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 7 , minimum 7-day, 50-year flow; Flow duration, 10-, 25-, 50-, 75-, and 90-percent flow duration; , minimum 7-day, 50 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Q flow 7 Peak (fig. 1) region Hydrologic Northwest Mountain Mountain Mountain Mountain Mountain Northwest Mountain Mountain Mountain Mountain Mountain Mountain Northwest Mountain Mountain Mountain Northwest Mountain Mountain Northwest Mountain Northwest Mountain Mountain Mountain Northwest Mountain Mountain Mountain Mountain Northwest Mountain Northwest Mountain Mountain Northwest Mountain Northwest , maximum 7-day, 2-year flow; Maximum , maximum 7-day, 2 Q 7 , minimum 7-day, 10-year flow; Minimum , minimum 7-day, 10 Q 7 Station name , minimum 7-day, 2-year flow; Minimum , minimum 7-day, 2 Q Gunnison River near Lazear, CO Gunnison River near Lazear, Leroux Creek near Cedaredge, CO Lake Fork at Lake City, CO Lake Fork at City, East River at Almont CO East River at West Hubbard Creek near Paonia, CO West Soap Creek near Sapinero, CO Cement Creek near Crested Butte, CO North Fork Gunnison River near Somerset, CO Cebolla Creek at Powderhorn, CO Slate River near Crested Butte, CO East River near Crested Butte, CO West Muddy Creek near Ragged Mountain, CO West Tomichi Creek at Gunnison, CO Tomichi Taylor River at Almont, CO River at Taylor East Muddy Creek near Bardine, CO Plateau Creek near Collbran, CO Quartz Creek near Ohio City, CO Quartz Creek near Ohio City, Taylor River at Taylor Park, CO Taylor River at Taylor Smith Fork near Crawford, CO Plateau Creek at Upper Station, near Collbran, CO Tomichi Creek at Parlin, CO Tomichi Mesa Creek near Mesa, CO Crystal Creek near Maher, CO Crystal Creek near Maher, Roan Creek near De Beque, CO Tomichi Creek at Sargents, CO Creek at Sargents, Tomichi Brush Creek near Collbran, CO Cimarron River near Cimarron, CO Parachute Creek near CO Gunnison River near Gunnison, CO Ward Creek near Grand Mesa, CO Ward Buzzard Creek near Collbran, CO Curecanti Creek near Sapinero, CO Beaver Creek near Rifle, CO Ohio Creek near Baldwin, CO Dirty George Creek near Grand Mesa, CO Dirty George Buzzard Creek below Owens Creek, near Heiberger, CO Buzzard Creek below Owens Creek, near Heiberger, Lake Fork at Gateview, CO Lake Fork at Gateview, Rifle Creek near Rifle, CO Ohio Creek at Baldwin, CO 7 Streamflow-gaging stations used in the development of regional streamflow regression equations.—Continued

Station number 09111500 09112500 09112000 09110500 09119000 09110000 09118000 09117000 09115500 09114500 09113500 09113300 09136200 09134500 09123500 09132900 09122500 09132500 09122000 09130600 09130500 09096500 09107000 09128500 09096000 09104500 09127500 09095000 09097600 09126000 09093000 09139200 09097500 09125000 09092500 09137800 09096800 09124500 09092000 X, station used in the development of regional regression equation for indicated streamflow characteristic and hydrologic region; --, not the indicated streamflow characteristic and hydrologic region] Table 4. Table 2-, 5-, 10-, 25-, 50-, 100-, 200-, and 500-year peak flow; Maximum [Peak flow, flow; Minimum 42 Regional Regression Equations for Estimation of Natural Streamflow Statistics in Colorado ------X X X X X X X X X X X X X X X X X X X X X X X X X X X Flow duration ------X X X X X X X X X X X X X X X X X X X X X X X X X X X Monthly Mean flow , maximum 7-day, 50-year , maximum 7-day, ------X X X X X X X X X X X X X X X X X X X X X X X X X X X 50 Q 7 Annual 50 ------X X X X X X X X X X X X X X X X X Q 7 10 ------X X X X X X X X X X X X X X X X X X Q 7 Minimum 2 Q ------X X X X X X X X X X X X X X X X X X X X X X 7 Streamflow characteristic 50 ------X X X X X X X X X X X X X X X X X X X X X X X X X X X Q 7 , maximum 7-day, 10-year flow; Maximum , maximum 7-day, 10 10 ------X X X X X X X X X X X X X X X X X X X X X X X X X X X Q 7 Q 7 Maximum 2 Q ------X X X X X X X X X X X X X X X X X X X X X X X X X X X 7 , minimum 7-day, 50-year flow; Flow duration, 10-, 25-, 50-, 75-, and 90-percent flow duration; , minimum 7-day, 50 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Q flow 7 Peak (fig. 1) region Hydrologic Southwest Northwest Southwest Southwest Northwest Southwest Southwest Northwest Southwest Southwest Northwest Northwest Southwest Southwest Northwest Southwest Southwest Southwest Northwest Southwest Southwest Southwest Mountain Northwest Southwest Southwest Southwest Northwest Southwest Northwest Southwest Southwest Northwest Southwest Northwest Southwest Southwest Mountain Southwest , maximum 7-day, 2-year flow; Maximum , maximum 7-day, 2 Q 7 , minimum 7-day, 10-year flow; Minimum , minimum 7-day, 10 Q 7 Station name , minimum 7-day, 2-year flow; Minimum , minimum 7-day, 2 Q Castle Creek above Diversions, near Moab, UT Cutthroat Draw near Rock Springs, WY Cutthroat Draw near Rock Springs, Dolores River at Dolores, CO Onion Creek near Moab, UT Deadman Wash near Point of Rocks, WY near Point of Rocks, Wash Deadman Dolores River below Rico, CO Taylor Creek near Gateway, CO Creek near Gateway, Taylor Delaney Draw near Red Desert, WY Delaney Draw near Red Desert, Cisco Wash near Cisco, UT Wash Cisco San Miguel River at Naturita, CO Greasewood Canyon near Green River, WY Greasewood Canyon near Green River, West Salt Creek near Mack, CO West West Naturita Creek near Norwood, CO West Cottonwood Creek near Monticello, UT Roubideau Creek at Mouth, near Delta, CO West Fork Dallas Creek near Ridgway, CO Fork Dallas Creek near Ridgway, West Cottonwood Creek near Nucla, CO Hatch Wash near La Sal, UT Wash Hatch Dry Creek near Olathe, CO Uncompahgre River below Ouray, CO Uncompahgre River below Ouray, San Miguel River near Placerville, CO Kane Springs Canyon near Moab, UT Cow Creek near Ridgway, CO Cow Creek near Ridgway, Tongue Creek at Cory, CO Creek at Cory, Tongue Fall Creek near Creek, CO Mill Creek near Moab, UT Dallas Creek near Ridgway, CO Dallas Creek near Ridgway, Surface Creek at Cedaredge, CO Dolores River at Bedrock, CO Bitter Cr Tributary near Green River WY near Green River Tributary Bitter Cr Courthouse Wash near Moab, UT Wash Courthouse Pleasant Valley Creek near Noel, CO Valley Pleasant Youngs Creek near Grand Mesa, CO Youngs Disappointment Creek Tributary near Slick Rock, CO Tributary Disappointment Creek Salt Wells Creek near Rock Springs, WY Creek near Rock Springs, Wells Salt Salt Wash near Thompson, UT near Wash Salt East Fork Dallas Creek near Ridgway, CO East Fork Dallas Creek near Ridgway, Kiser Creek near Grand Mesa, CO Disappointment Creek near Dove Creek, CO 7 Streamflow-gaging stations used in the development of regional streamflow regression equations.—Continued

Station number 09168100 09182000 09216600 09166500 09181000 09216550 09165000 09177500 09216537 09163700 09175500 09216400 09153400 09175000 09187000 09150500 09146400 09174500 09185500 09149450 09146000 09172500 09185200 09147100 09144200 09172000 09184000 09147000 09143500 09169500 09216900 09183000 09146600 09141200 09168700 09216700 09182600 09146500 09140200 X, station used in the development of regional regression equation for indicated streamflow characteristic and hydrologic region; --, not the indicated streamflow characteristic and hydrologic region] Table 4. Table 2-, 5-, 10-, 25-, 50-, 100-, 200-, and 500-year peak flow; Maximum [Peak flow, flow; Minimum Supplemental Information 43 ------X X X X X X X X X X X X X X X X X X X X X X X X Flow duration ------X X X X X X X X X X X X X X X X X X X X X X X X Monthly Mean flow , maximum 7-day, 50-year , maximum 7-day, ------X X X X X X X X X X X X X X X X X X X X X X X X 50 Q 7 Annual 50 ------X X X X X X X X X X X X X X X X X Q 7 10 ------X X X X X X X X X X X X X X X X X X X X Q 7 Minimum 2 Q ------X X X X X X X X X X X X X X X X X X X X X X X 7 Streamflow characteristic 50 ------X X X X X X X X X X X X X X X X X X X X X X X X X Q 7 , maximum 7-day, 10-year flow; Maximum , maximum 7-day, 10 10 ------X X X X X X X X X X X X X X X X X X X X X X X X X Q 7 Q 7 Maximum 2 Q ------X X X X X X X X X X X X X X X X X X X X X X X X X 7 , minimum 7-day, 50-year flow; Flow duration, 10-, 25-, 50-, 75-, and 90-percent flow duration; , minimum 7-day, 50 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Q flow 7 Peak (fig. 1) region Hydrologic Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Mountain Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest Northwest , maximum 7-day, 2-year flow; Maximum , maximum 7-day, 2 Q 7 , minimum 7-day, 10-year flow; Minimum , minimum 7-day, 10 Q 7 Station name , minimum 7-day, 2-year flow; Minimum , minimum 7-day, 2 Q Brownie Canyon Above Sinks, near Dry Fork, UT Brownie Canyon Milk Creek near Thornburgh, CO Thornburgh, Milk Creek near North Fork Of Dry near Fork, UT Dry Cow Creek near Baggs, WY Dry Cow Creek near Baggs, East Fork Williams Fork near Pagoda, CO Williams East Fork Dry Fork Above Sinks, near Dry Fork, UT Dry Fork Willow Creek near Dixon, WY Creek near Dixon, Willow North Fork Elkhead Creek near Elkhead, CO Ashley Creek near Vernal, UT Vernal, Ashley Creek near Willow Creek near Baggs, WY Creek near Baggs, Willow Elkhead Creek near Elkhead, CO South Fork Ashley Creek nearVernal, UT Ashley Creek nearVernal, South Fork Little Snake River near Dixon, WY Little Snake River near Dixon, Fish Creek near Milner, CO Fish Creek near Milner, Ashley C Below Trout C near Vernal, UT Vernal, C near Trout Ashley C Below Green River Tributary No 2 near Burntfork, WY No 2 near Burntfork, Tributary Green River Savery Creek near Savery, WY Savery Creek near Savery, Elk River at Clark, CO Cow Wash near Jensen, UT Wash Cow Squaw Hollow near Burntfork, WY Squaw Hollow near Burntfork, Slater Fork near Slater, CO Slater Fork near Slater, Yampa River at Steamboat Springs, CO Yampa Cliff Creek near Jensen, UT Cliff Summers Dry Creek near Green River, WY Summers Dry Creek near Green River, Battle Creek near Encampment, WY Battle Creek near Encampment, Walton Creek near Steamboat Springs, CO Walton Little Snake River near Lily, CO Little Snake River near Lily, Blacks Fork Tributary No 4 near Green River, WY No 4 near Green River, Tributary Blacks Fork Little Snake River near Slater, CO Little Snake River near Slater, Dry Fork at Mouth near Fork, UT Pot Creek Above Diversions, near Vernal, UT Vernal, Above Diversions, near Pot Creek Fourmile Creek near Baggs, WY Fourmile Creek near Baggs, Blacks Fork Tributary No 3 near Green River, WY No 3 near Green River, Tributary Blacks Fork North Fork Little Snake River near Encampment, WY North Fork Little Snake River near Encampment, East Fork Of Dry near Fork, UT Henrys Fork Tributary near Manila, UT Tributary Henrys Fork Muddy Creek above Baggs, WY Muddy Creek above Baggs, Blacks Fork Tributary No 2 near Green River, WY No 2 near Green River, Tributary Blacks Fork Middle Fork Little Snake River near Battle Creek, CO 7 Streamflow-gaging stations used in the development of regional streamflow regression equations.—Continued

Station number 09268900 09250000 09268500 09258200 09249000 09268000 09258000 09245500 09266500 09257500 09245000 09264500 09257000 09244100 09264000 09225300 09256000 09241000 09263800 09225200 09255000 09239500 09263700 09224980 09253400 09238500 09260000 09224840 09253000 09270500 09235600 09259500 09224820 09251800 09269000 09229450 09258900 09224810 09251500 X, station used in the development of regional regression equation for indicated streamflow characteristic and hydrologic region; --, not the indicated streamflow characteristic and hydrologic region] Table 4. Table 2-, 5-, 10-, 25-, 50-, 100-, 200-, and 500-year peak flow; Maximum [Peak flow, flow; Minimum 44 Regional Regression Equations for Estimation of Natural Streamflow Statistics in Colorado ------X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Flow duration ------X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Monthly Mean flow , maximum 7-day, 50-year , maximum 7-day, ------X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 50 Q 7 Annual 50 ------X X X X X X X X X X X X X X X X X X Q 7 10 ------X X X X X X X X X X X X X X X X X X X X X Q 7 Minimum 2 Q ------X X X X X X X X X X X X X X X X X X X X X X X 7 Streamflow characteristic 50 ------X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Q 7 , maximum 7-day, 10-year flow; Maximum , maximum 7-day, 10 10 ------X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Q 7 Q 7 Maximum 2 Q ------X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 7 , minimum 7-day, 50-year flow; Flow duration, 10-, 25-, 50-, 75-, and 90-percent flow duration; , minimum 7-day, 50 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Q flow 7 Peak (fig. 1) region Hydrologic Southwest Northwest Southwest Southwest Northwest Southwest Southwest Northwest Southwest Southwest Northwest Southwest Southwest Northwest Mountain Northwest Southwest Northwest Northwest Northwest Southwest Northwest Mountain Northwest Southwest Northwest Mountain Northwest Southwest Northwest Northwest Northwest Southwest Mountain Northwest Northwest , maximum 7-day, 2-year flow; Maximum , maximum 7-day, 2 Q 7 , minimum 7-day, 10-year flow; Minimum , minimum 7-day, 10 Q 7 Station name , minimum 7-day, 2-year flow; Minimum , minimum 7-day, near Pagosa Springs, CO near Pagosa Springs, CO near Chromo, CO 2 Q Piedra R at Bridge Ranger Station, near Pagosa Spgs, CO Piceance Creek below Ryan Gulch, near Rio Blanco, CO Piceance Creek below Ryan West Fork San Juan River above Borns Lake, West Rio Amargo at Dulce, NM Amargo Rio Willow Creek near Rio Blanco, CO Willow East Fork San Juan River near Pagosa Springs, CO Navajo River at Edith, CO Scandard Gulch at Mouth, near Rio Blanco, CO East Fork San Juan River above Sand Creek, Little Navajo River Below Lake Oso Diversion Dam, Piceance Creek Tributary near Rio Blanco, CO Tributary Piceance Creek Cresent Wash near Cresent Junction, UT Wash Cresent Navajo River at Banded Peak Ranch, near Chromo, CO Cottonwood Gulch near Rio Blanco, CO South Fork White River at Budges Resort, CO South Fork Willow Creek near Ouray, UT Creek near Ouray, Willow Rito Blanco near Pagosa Springs, CO Sorghum Gulch at mouth, near Rio Blanco, CO Sorghum North Fork White River at Buford, CO North Fork Willow Creek above Diversions near Ouray, UT Creek above Diversions near Ouray, Willow Rio Blanco near Pagosa Springs, CO Piceance Creek below Rio Blanco, CO Marvine Creek near Buford, CO Bitter Creek near Bonanza, UT San Juan River at Pagosa Springs, CO White River near Meeker, CO White River near Meeker, Lost Creek near Buford, CO Yellow Creek near White River, CO White River, Creek near Yellow Turkey Creek near Pagosa Springs, CO Turkey South Fork White River at Buford, CO South Fork Uintah River at Fort Duchesne, UT Corral Gulch near Rangely, CO Corral Gulch near Rangely, West Fork San Juan River near Pagosa Springs, CO West Wagonwheel Creek at Budges Resort, CO Wagonwheel Halfway Hollow Tributary near Lapoint, UT Tributary Halfway Hollow Box Elder Gulch near Rangely, CO Box Elder Gulch near Rangely, 7 Streamflow-gaging stations used in the development of regional streamflow regression equations.—Continued

Station number 09347500 09306200 09340500 09346200 09306058 09340000 09346000 09306052 09339900 09345200 09306042 09328900 09344000 09306039 09303300 09308000 09343500 09306036 09303000 09307500 09343000 09306007 09302500 09306800 09342500 09304500 09302450 09306255 09342000 09304000 09300500 09306242 09341500 09303320 09271800 09306240 X, station used in the development of regional regression equation for indicated streamflow characteristic and hydrologic region; --, not the indicated streamflow characteristic and hydrologic region] Table 4. Table 2-, 5-, 10-, 25-, 50-, 100-, 200-, and 500-year peak flow; Maximum [Peak flow, flow; Minimum Supplemental Information 45 ------X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Flow duration ------X X X X X X X X X X X X X X X X X X X X X X X X X X X Monthly Mean flow , maximum 7-day, 50-year , maximum 7-day, ------X X X X X X X X X X X X X X X X X X X X X X X X X 50 Q 7 Annual 50 ------X X X X X X X X X X X X Q 7 10 ------X X X X X X X X X X X X X X Q 7 Minimum 2 Q ------X X X X X X X X X X X X X X X X X X 7 Streamflow characteristic 50 ------X X X X X X X X X X X X X X X X X X X X X X X X X X X Q 7 , maximum 7-day, 10-year flow; Maximum , maximum 7-day, 10 10 ------X X X X X X X X X X X X X X X X X X X X X X X X X X X Q 7 Q 7 Maximum 2 Q ------X X X X X X X X X X X X X X X X X X X X X X X X X X X 7 , minimum 7-day, 50-year flow; Flow duration, 10-, 25-, 50-, 75-, and 90-percent flow duration; , minimum 7-day, 50 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Q flow 7 Peak (fig. 1) region Hydrologic Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest Southwest , maximum 7-day, 2-year flow; Maximum , maximum 7-day, 2 Q 7 , minimum 7-day, 10-year flow; Minimum , minimum 7-day, 10 Q 7 Station name , minimum 7-day, 2-year flow; Minimum , minimum 7-day, 2 Q Black Mountain Wash near Chinle, AZ near Chinle, Wash Black Mountain La Plata River at Hesperus, CO Cob Wash near Bluff, UT near Bluff, Wash Cob West Mancos River near Mancos, CO West Salt Creek near Oxford, CO Cottonwood Wash near Blanding, UT Wash Cottonwood Malpais Arroyo near Shiprock, NM Malpais Florida River near Durango, CO Recapture Creek below Johnson near Blanding, UT Rattlesnake Arroyo near Shiprock, NM Rattlesnake Lightner Creek near Durango, CO Recapture Creek near Blanding, UT Chaco River near Waterflow , NM Waterflow Chaco River near Animas River at Durango, CO South Creek Above Reservoir near Monticello, UT South Creek West Draw near Farmington, NM West Shumway Arroyo near Waterflow, NM Waterflow, Arroyo near Shumway Junction Creek near Durango, CO Mcelmo Creek near CO-UT State Line Mcelmo Creek near CO-UT Gallegos Canyon Tributary near Nageezi, NM Tributary Gallegos Canyon Stevens Arroyo near Kirtland, NM Stevens Hermosa Creek near Hermosa, CO Mcelmo Creek Tributary near Cortez, CO Tributary Mcelmo Creek Spring Creek at La Boca, CO Locke Arroyo near Kirtland, NM Locke Mineral Creek near Silverton, CO Mancos River near Towaoc, CO Towaoc, Mancos River near Vallecito Creek near Bayfield, CO Vallecito La Plata River Tributary near Farmington, NM Tributary La Plata River Lime Creek near Mexican Hat, UT Cement Creek at Silverton, CO Middle Mancos River near Mancos, CO Vaqueros Canyon near Gobernador, NM Canyon near Gobernador, Vaqueros La Plata River at CO-NM State Line Animas River at Howardsville, CO AZ near Lukachukai, Tributary Lukachukai Creek East Mancos River near Mancos, CO Piedra River near Arboles, CO Piedra River near Cherry Creek near Red Mesa, CO 7 Streamflow-gaging stations used in the development of regional streamflow regression equations.—Continued

Station number 09379030 09365500 09379000 09368500 09363100 09378700 09368020 09363000 09378650 09367980 09362000 09378630 09367950 09361500 09378170 09357230 09367561 09361400 09372000 09357200 09367550 09361000 09371300 09355000 09367530 09359000 09371000 09352900 09367400 09379300 09358550 09369500 09350800 09366500 09357500 09379060 09369000 09349800 09366000 X, station used in the development of regional regression equation for indicated streamflow characteristic and hydrologic region; --, not the indicated streamflow characteristic and hydrologic region] Table 4. Table 2-, 5-, 10-, 25-, 50-, 100-, 200-, and 500-year peak flow; Maximum [Peak flow, flow; Minimum