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U.S. Department of the Interior U.S. Geological Survey Utah Water Science Center

Upper Colorado River Streamflow and Reservoir Contents

Provisional Data for: WATER YEAR 2019

All data contained in this report is provisional and subject to revision.

Available online at usgs.gov/centers/ut-water PROVISIONAL DATA U.S. GEOLOGICAL SURVEY SUBJECT TO REVISION UTAH WATER SCIENCE CENTER STREAMFLOW AND RESERVOIR CONTENTS IN UPPER COLORADO RIVER BASIN DAYS IN contact 435-259-4430 or [email protected] MONTH October 2018 31 MONTHLY DISCHARGE (a) MAXIMUM DAILY MINIMUM DAILY (A)MEDIAN PERCENT TOTAL 3 3 3 3 3 STREAM ft /s MEAN ft /s 30 YEAR ft /s ACRE ft /s DATE ft /s DATE (1981-2010) THIS MONTH MEDIAN DAYS FEET COLORADO RIVER NR CISCO, UTAH 4,355 3,202 74% 99,433 196,878 5,090 8-Oct 1,990 1-Oct ADJUSTED (B) 2,638 61% 81,764 162,178 GREEN RIVER AT GREEN RIVER , UT 2,945 2,743 93% 85,031 168,362 3,430 6-Oct 2,030 1-Oct ADJUSTED (C) 1,889 64% 58,564 116,162 SAN JUAN RIVER NEAR BLUFF, UT 1,232 649 53% 20,164 39,924 1,010 7-Oct 429 6-Oct ADJUSTED (D) 391 32% 12,112 24,024

DOLORES RIVER NR CISCO, UTAH 237 123 52% 3,565 7,058 493 8-Oct 22 1-Oct ADJUSTED (E) 141 60% 4,373 8,673

(A) MEDIAN OF MEAN DISCHARGES FOR THE MONTH FOR 30-YR PERIOD 1981-2010 (B) ADJUSTED FOR CHANGE IN STORAGE IN BLUE MESA RESERVOIR. STORAGE BEGAN OCT. 27, 1965 (C) ADJUSTED FOR CHANGE IN STORAGE IN FLAMING GORGE RESERVOIR & FONTENELLE RESERVOIR, STORAGE BEGAN NOV. 1, 1962 & OCT., 1964 RESPECTIVELY. (D) ADJUSTED FOR CHANGE IN STORAGE IN NAVAJO RESERVOIR (STORAGE BEGAN JUNE 27, 1962) AND SINCE AUGUST 1964, RELEASES TO NAVAJO INDIAN IRRIGATION PROJECT (NIIP). RELEASES TO NIIP BEGAN JANUARY 1976. (E) ADJUSTED FOR CHANGE IN STORAGE IN MCPHEE RESERVOIR. STORAGE BEGAN MAR 20, 1984

DRAINAGE USABLE END OF MO. CHANGE DURING RESERVOIR ABOVE DAM CAPACITY USABLE CONTENTS MONTH PREVIOUS (MI2) (AC-FT) (AC-FT) (AC-FT) MONTH MCPHEE RESERVOIR, MONTEZUMA COUNTY, CO 809 229,200 169,696 1,615 168,081 BLUE MESA RESERVOIR NEAR SAPINERO, COLORADO 3,426 829,500 247,700 -34,700 282,400 FLAMING GORGE RESERVOIR AT FLAMING GORGE DAM, UT (b) 15,100 3,739,000 3,350,200 -27,800 3,378,000 FONTENELLE RESERVOIR AT FONTENELLE , WYOMING (b) 4,280 344,300 238,000 -24,400 262,400 NAVAJO RESERVOIR NEAR ARCHULETA, NEW MEXICO (b) 3,320 1,696,000 896,500 -22,800 919,300 NIIP 6,900 LAKE POWELL RESERVOIR AT GLEN CANYON DAM, ARIZONA (b) 107,700 25,002,000 10,862,200 -165,500 11,027,700

TOTALS 31,620,800 15,594,600 -275,200 15,869,800 (a) Preliminary Data (b) Approximate PROVISIONAL DATA U.S. GEOLOGICAL SURVEY SUBJECT TO REVISION UTAH WATER SCIENCE CENTER STREAMFLOW AND RESERVOIR CONTENTS IN UPPER COLORADO RIVER BASIN DAYS IN contact 435-259-4430 or [email protected] MONTH November 2018 30 MONTHLY DISCHARGE (a) MAXIMUM DAILY MINIMUM DAILY (A)MEDIAN PERCENT TOTAL 3 3 3 3 3 STREAM ft /s MEAN ft /s 30 YEAR ft /s ACRE ft /s DATE ft /s DATE (1981-2010) THIS MONTH MEDIAN DAYS FEET COLORADO RIVER NR CISCO, UTAH 4,087 2,657 65% 79,836 158,075 3,350 3-Nov 2,170 29-Nov ADJUSTED (B) 2,697 66% 80,905 160,475 GREEN RIVER AT GREEN RIVER , UT 2,985 2,366 79% 71,102 140,782 2,540 29-Nov 2,240 18-Nov ADJUSTED (C) 1,423 48% 42,693 84,682 SAN JUAN RIVER NEAR BLUFF, UT 1,136 605 53% 18,171 35,978 806 3-Nov 550 29-Nov ADJUSTED (D) 463 41% 13,904 27,578

DOLORES RIVER NR CISCO, UTAH 189 92 49% 2,764 5,473 120 2-Nov 58 23-Nov ADJUSTED (E) 88 47% 2,651 5,258

DRAINAGE USABLE END OF MO. CHANGE DURING RESERVOIR ABOVE DAM CAPACITY USABLE CONTENTS MONTH PREVIOUS (MI2) (AC-FT) (AC-FT) (AC-FT) MONTH MCPHEE RESERVOIR, MONTEZUMA COUNTY, CO 809 229,200 169,481 -215 169,696 BLUE MESA RESERVOIR NEAR SAPINERO, COLORADO 3,426 829,500 250,100 2,400 247,700 FLAMING GORGE RESERVOIR AT FLAMING GORGE DAM, UT (b) 15,100 3,739,000 3,316,300 -33,900 3,350,200 FONTENELLE RESERVOIR AT FONTENELLE , WYOMING (b) 4,280 344,300 215,800 -22,200 238,000 NAVAJO RESERVOIR NEAR ARCHULETA, NEW MEXICO (b) 3,320 1,696,000 888,100 -8,400 896,500 NIIP 0 LAKE POWELL RESERVOIR AT GLEN CANYON DAM, ARIZONA (b) 107,700 25,002,000 10,506,600 -355,600 10,862,200

TOTALS 31,620,800 15,176,900 -417,700 15,594,600 (a) Preliminary Data (b) Approximate PROVISIONAL DATA U.S. GEOLOGICAL SURVEY SUBJECT TO REVISION UTAH WATER SCIENCE CENTER STREAMFLOW AND RESERVOIR CONTENTS IN UPPER COLORADO RIVER BASIN DAYS IN contact 435-259-4430 or [email protected] MONTH December 2018 31 MONTHLY DISCHARGE (a) MAXIMUM DAILY MINIMUM DAILY (A)MEDIAN PERCENT TOTAL 3 3 3 3 3 STREAM ft /s MEAN ft /s 30 YEAR ft /s ACRE ft /s DATE ft /s DATE (1981-2010) THIS MONTH MEDIAN DAYS FEET COLORADO RIVER NR CISCO, UTAH 3,627 2,279 63% 70,763 140,111 2,660 1-Dec 1,960 31-Dec ADJUSTED (B) 2,258 62% 69,983 138,811 GREEN RIVER AT GREEN RIVER , UT 2,362 2,766 117% 83,137 164,611 3,090 29-Dec 2,100 31-Dec ADJUSTED (C) 1,135 48% 35,196 69,811 SAN JUAN RIVER NEAR BLUFF, UT 1,019 521 51% 16,175 32,027 637 10-Dec 465 25-Dec ADJUSTED (D) 368 36% 11,408 22,627

DOLORES RIVER NR CISCO, UTAH 170 82 48% 2,548 5,044 138 1-Dec 56 30-Dec ADJUSTED (E) 58 34% 1,813 3,596

DRAINAGE USABLE END OF MO. CHANGE DURING RESERVOIR ABOVE DAM CAPACITY USABLE CONTENTS MONTH PREVIOUS (MI2) (AC-FT) (AC-FT) (AC-FT) MONTH MCPHEE RESERVOIR, MONTEZUMA COUNTY, CO 809 229,200 168,033 -1,448 169,481 BLUE MESA RESERVOIR NEAR SAPINERO, COLORADO 3,426 829,500 248,800 -1,300 250,100 FLAMING GORGE RESERVOIR AT FLAMING GORGE DAM, UT (b) 15,100 3,739,000 3,253,200 -63,100 3,316,300 FONTENELLE RESERVOIR AT FONTENELLE , WYOMING (b) 4,280 344,300 184,100 -31,700 215,800 NAVAJO RESERVOIR NEAR ARCHULETA, NEW MEXICO (b) 3,320 1,696,000 878,700 -9,400 888,100 NIIP 0 LAKE POWELL RESERVOIR AT GLEN CANYON DAM, ARIZONA (b) 107,700 25,002,000 10,098,900 -407,700 10,506,600

TOTALS 31,620,800 14,663,700 -513,200 15,176,900 (a) Preliminary Data (b) Approximate PROVISIONAL DATA U.S. GEOLOGICAL SURVEY SUBJECT TO REVISION UTAH WATER SCIENCE CENTER STREAMFLOW AND RESERVOIR CONTENTS IN UPPER COLORADO RIVER BASIN DAYS IN contact 435-259-4430 or [email protected] MONTH January 2019 31 MONTHLY DISCHARGE (a) MAXIMUM DAILY MINIMUM DAILY (A)MEDIAN PERCENT TOTAL 3 3 3 3 3 STREAM ft /s MEAN ft /s 30 YEAR ft /s ACRE ft /s DATE ft /s DATE (1981-2010) THIS MONTH MEDIAN DAYS FEET COLORADO RIVER NR CISCO, UTAH 3,325 2,246 68% 69,741 138,088 2,820 8-Jan 1,710 5-Jan ADJUSTED (B) 2,293 69% 71,080 140,988 GREEN RIVER AT GREEN RIVER , UT 2,499 2,851 114% 88,541 175,312 3,420 13-Jan 1,400 4-Jan ADJUSTED (C) 1,387 56% 43,011 85,312 SAN JUAN RIVER NEAR BLUFF, UT 1,026 566 55% 17,567 34,783 684 7-Jan 490 11-Jan ADJUSTED (D) 410 40% 12,696 25,183

DOLORES RIVER NR CISCO, UTAH 160 99 62% 3,087 6,113 172 19-Jan 48 3-Jan ADJUSTED (E) 108 68% 3,345 6,634

DRAINAGE USABLE END OF MO. CHANGE DURING RESERVOIR ABOVE DAM CAPACITY USABLE CONTENTS MONTH PREVIOUS (MI2) (AC-FT) (AC-FT) (AC-FT) MONTH MCPHEE RESERVOIR, MONTEZUMA COUNTY, CO 809 229,200 168,554 521 168,033 BLUE MESA RESERVOIR NEAR SAPINERO, COLORADO 3,426 829,500 251,700 2,900 248,800 FLAMING GORGE RESERVOIR AT FLAMING GORGE DAM, UT (b) 15,100 3,739,000 3,197,700 -55,500 3,253,200 FONTENELLE RESERVOIR AT FONTENELLE , WYOMING (b) 4,280 344,300 149,600 -34,500 184,100 NAVAJO RESERVOIR NEAR ARCHULETA, NEW MEXICO (b) 3,320 1,696,000 869,100 -9,600 878,700 NIIP 0 LAKE POWELL RESERVOIR AT GLEN CANYON DAM, ARIZONA (b) 107,700 25,002,000 9,629,200 -469,700 10,098,900

TOTALS 31,620,800 14,097,300 -566,400 14,663,700 (a) Preliminary Data (b) Approximate PROVISIONAL DATA U.S. GEOLOGICAL SURVEY SUBJECT TO REVISION UTAH WATER SCIENCE CENTER STREAMFLOW AND RESERVOIR CONTENTS IN UPPER COLORADO RIVER BASIN DAYS IN contact 435-259-4430 or [email protected] MONTH February 2019 28 MONTHLY DISCHARGE (a) MAXIMUM DAILY MINIMUM DAILY (A)MEDIAN PERCENT TOTAL 3 3 3 3 3 STREAM ft /s MEAN ft /s 30 YEAR ft /s ACRE ft /s DATE ft /s DATE (1981-2010) THIS MONTH MEDIAN DAYS FEET COLORADO RIVER NR CISCO, UTAH 3,307 2,457 74% 68,917 136,455 4,210 16-Feb 1,850 1-Feb ADJUSTED (B) 2,385 72% 66,779 132,455 GREEN RIVER AT GREEN RIVER , UT 2,855 2,859 100% 80,187 158,770 3,220 20-Feb 2,220 12-Feb ADJUSTED (C) 1,445 51% 40,469 80,270 SAN JUAN RIVER NEAR BLUFF, UT 1,217 794 65% 22,265 44,086 2,150 17-Feb 535 12-Feb ADJUSTED (D) 747 61% 20,915 41,486

DOLORES RIVER NR CISCO, UTAH 195 138 71% 3,866 7,654 838 16-Feb 57 1-Feb ADJUSTED (E) 116 59% 3,240 6,427

DRAINAGE USABLE END OF MO. CHANGE DURING RESERVOIR ABOVE DAM CAPACITY USABLE CONTENTS MONTH PREVIOUS (MI2) (AC-FT) (AC-FT) (AC-FT) MONTH MCPHEE RESERVOIR, MONTEZUMA COUNTY, CO 809 229,200 167,327 -1,227 168,554 BLUE MESA RESERVOIR NEAR SAPINERO, COLORADO 3,426 829,500 247,700 -4,000 251,700 FLAMING GORGE RESERVOIR AT FLAMING GORGE DAM, UT (b) 15,100 3,739,000 3,148,800 -48,900 3,197,700 FONTENELLE RESERVOIR AT FONTENELLE , WYOMING (b) 4,280 344,300 120,000 -29,600 149,600 NAVAJO RESERVOIR NEAR ARCHULETA, NEW MEXICO (b) 3,320 1,696,000 865,200 -3,900 869,100 NIIP 1,300 LAKE POWELL RESERVOIR AT GLEN CANYON DAM, ARIZONA (b) 107,700 25,002,000 9,260,700 -368,500 9,629,200

TOTALS 31,620,800 13,642,400 -454,900 14,097,300 (a) Preliminary Data (b) Approximate PROVISIONAL DATA U.S. GEOLOGICAL SURVEY SUBJECT TO REVISION UTAH WATER SCIENCE CENTER STREAMFLOW AND RESERVOIR CONTENTS IN UPPER COLORADO RIVER BASIN DAYS IN contact 435-259-4430 or [email protected] MONTH March 2019 31 MONTHLY DISCHARGE (a) MAXIMUM DAILY MINIMUM DAILY (A)MEDIAN PERCENT TOTAL 3 3 3 3 3 STREAM ft /s MEAN ft /s 30 YEAR ft /s ACRE ft /s DATE ft /s DATE (1981-2010) THIS MONTH MEDIAN DAYS FEET COLORADO RIVER NR CISCO, UTAH 3,934 3,492 89% 108,439 214,709 5,420 14-Mar 2,610 1-Mar ADJUSTED (B) 3,524 90% 109,256 216,709 GREEN RIVER AT GREEN RIVER , UT 3,790 3,423 90% 106,292 210,459 4,110 31-Mar 2,790 18-Mar ADJUSTED (C) 3,607 95% 111,802 221,759 SAN JUAN RIVER NEAR BLUFF, UT 1,262 1,895 150% 58,853 116,529 5,290 14-Mar 1,090 1-Mar ADJUSTED (D) 3,421 271% 106,039 210,329

DOLORES RIVER NR CISCO, UTAH 360 377 105% 11,721 23,208 994 14-Mar 202 12-Mar ADJUSTED (E) 391 109% 12,128 24,056

DRAINAGE USABLE END OF MO. CHANGE DURING RESERVOIR ABOVE DAM CAPACITY USABLE CONTENTS MONTH PREVIOUS (MI2) (AC-FT) (AC-FT) (AC-FT) MONTH MCPHEE RESERVOIR, MONTEZUMA COUNTY, CO 809 229,200 168,175 848 167,327 BLUE MESA RESERVOIR NEAR SAPINERO, COLORADO 3,426 829,500 249,700 2,000 247,700 FLAMING GORGE RESERVOIR AT FLAMING GORGE DAM, UT (b) 15,100 3,739,000 3,185,000 36,200 3,148,800 FONTENELLE RESERVOIR AT FONTENELLE , WYOMING (b) 4,280 344,300 95,100 -24,900 120,000 NAVAJO RESERVOIR NEAR ARCHULETA, NEW MEXICO (b) 3,320 1,696,000 955,500 90,300 865,200 NIIP 3,500 LAKE POWELL RESERVOIR AT GLEN CANYON DAM, ARIZONA (b) 107,700 25,002,000 9,049,000 -211,700 9,260,700

TOTALS 31,620,800 13,534,300 -108,100 13,642,400 (a) Preliminary Data (b) Approximate PROVISIONAL DATA U.S. GEOLOGICAL SURVEY SUBJECT TO REVISION UTAH WATER SCIENCE CENTER STREAMFLOW AND RESERVOIR CONTENTS IN UPPER COLORADO RIVER BASIN DAYS IN contact 435-259-4430 or [email protected] MONTH April 2019 30 MONTHLY DISCHARGE (a) MAXIMUM DAILY MINIMUM DAILY (A)MEDIAN PERCENT TOTAL 3 3 3 3 3 STREAM ft /s MEAN ft /s 30 YEAR ft /s ACRE ft /s DATE ft /s DATE (1981-2010) THIS MONTH MEDIAN DAYS FEET COLORADO RIVER NR CISCO, UTAH 6,800 7,882 116% 236,886 469,034 17,400 30-Apr 3,490 3-Apr ADJUSTED (B) 9,312 137% 279,372 554,134 GREEN RIVER AT GREEN RIVER , UT 5,242 6,005 115% 180,459 357,308 11,800 30-Apr 3,600 6-Apr ADJUSTED (C) 8,678 166% 260,352 516,408 SAN JUAN RIVER NEAR BLUFF, UT 1,766 1,970 112% 59,197 117,211 3,340 30-Apr 1,350 4-Apr ADJUSTED (D) 5,008 284% 150,245 298,011

DOLORES RIVER NR CISCO, UTAH 1,482 2,186 148% 65,702 130,089 4,030 30-Apr 411 3-Apr ADJUSTED (E) 3,703 250% 111,095 220,357

DRAINAGE USABLE END OF MO. CHANGE DURING RESERVOIR ABOVE DAM CAPACITY USABLE CONTENTS MONTH PREVIOUS (MI2) (AC-FT) (AC-FT) (AC-FT) MONTH MCPHEE RESERVOIR, MONTEZUMA COUNTY, CO 809 229,200 258,443 90,268 168,175 BLUE MESA RESERVOIR NEAR SAPINERO, COLORADO 3,426 829,500 334,800 85,100 249,700 FLAMING GORGE RESERVOIR AT FLAMING GORGE DAM, UT (b) 15,100 3,739,000 3,302,600 117,600 3,185,000 FONTENELLE RESERVOIR AT FONTENELLE , WYOMING (b) 4,280 344,300 136,600 41,500 95,100 NAVAJO RESERVOIR NEAR ARCHULETA, NEW MEXICO (b) 3,320 1,696,000 1,116,700 161,200 955,500 NIIP 19,600 LAKE POWELL RESERVOIR AT GLEN CANYON DAM, ARIZONA (b) 107,700 25,002,000 9,197,900 148,900 9,049,000

TOTALS 31,620,800 14,088,600 554,300 13,534,300 (a) Preliminary Data (b) Approximate PROVISIONAL DATA U.S. GEOLOGICAL SURVEY SUBJECT TO REVISION UTAH WATER SCIENCE CENTER STREAMFLOW AND RESERVOIR CONTENTS IN UPPER COLORADO RIVER BASIN DAYS IN contact 435-259-4430 or [email protected] MONTH May 2019 31 MONTHLY DISCHARGE (a) MAXIMUM DAILY MINIMUM DAILY (A)MEDIAN PERCENT TOTAL 3 3 3 3 3 STREAM ft /s MEAN ft /s 30 YEAR ft /s ACRE ft /s DATE ft /s DATE (1981-2010) THIS MONTH MEDIAN DAYS FEET COLORADO RIVER NR CISCO, UTAH 12,600 14,572 116% 452,530 896,010 21,600 1-May 10,900 13-May ADJUSTED (B) 16,400 130% 508,399 1,008,410 GREEN RIVER AT GREEN RIVER , UT 11,635 11,593 100% 360,009 712,819 15,100 2-May 9,130 16-May ADJUSTED (C) 13,892 119% 430,662 854,219 SAN JUAN RIVER NEAR BLUFF, UT 4,209 2,563 61% 79,606 157,621 3,740 19-May 1,960 31-May ADJUSTED (D) 5,613 133% 173,996 345,121

DOLORES RIVER NR CISCO, UTAH 2,103 2,428 116% 75,414 149,319 5,020 1-May 1,630 21-May ADJUSTED (E) 3,652 174% 113,216 224,563

DRAINAGE USABLE END OF MO. CHANGE DURING RESERVOIR ABOVE DAM CAPACITY USABLE CONTENTS MONTH PREVIOUS (MI2) (AC-FT) (AC-FT) (AC-FT) MONTH MCPHEE RESERVOIR, MONTEZUMA COUNTY, CO 809 229,200 333,687 75,244 258,443 BLUE MESA RESERVOIR NEAR SAPINERO, COLORADO 3,426 829,500 447,200 112,400 334,800 FLAMING GORGE RESERVOIR AT FLAMING GORGE DAM, UT (b) 15,100 3,739,000 3,376,500 73,900 3,302,600 FONTENELLE RESERVOIR AT FONTENELLE , WYOMING (b) 4,280 344,300 204,100 67,500 136,600 NAVAJO RESERVOIR NEAR ARCHULETA, NEW MEXICO (b) 3,320 1,696,000 1,278,800 162,100 1,116,700 NIIP 25,400 LAKE POWELL RESERVOIR AT GLEN CANYON DAM, ARIZONA (b) 107,700 25,002,000 10,343,100 1,145,200 9,197,900

TOTALS 31,620,800 15,649,700 1,561,100 14,088,600 (a) Preliminary Data (b) Approximate PROVISIONAL DATA U.S. GEOLOGICAL SURVEY SUBJECT TO REVISION UTAH WATER SCIENCE CENTER STREAMFLOW AND RESERVOIR CONTENTS IN UPPER COLORADO RIVER BASIN DAYS IN contact 435-259-4430 or [email protected] MONTH June 2019 30 MONTHLY DISCHARGE (a) MAXIMUM DAILY MINIMUM DAILY (A)MEDIAN PERCENT TOTAL 3 3 3 3 3 STREAM ft /s MEAN ft /s 30 YEAR ft /s ACRE ft /s DATE ft /s DATE (1981-2010) THIS MONTH MEDIAN DAYS FEET COLORADO RIVER NR CISCO, UTAH 13,805 28,983 210% 871,018 1,724,615 39,100 10-Jun 17,000 1-Jun ADJUSTED (B) 33,160 240% 994,815 1,973,215 GREEN RIVER AT GREEN RIVER , UT 12,350 21,915 177% 658,603 1,304,034 28,600 19-Jun 11,100 1-Jun ADJUSTED (C) 24,078 195% 722,326 1,432,734 SAN JUAN RIVER NEAR BLUFF, UT 3,931 6,281 160% 188,774 373,773 11,100 16-Jun 1,830 1-Jun ADJUSTED (D) 10,610 270% 318,313 631,373

DOLORES RIVER NR CISCO, UTAH 1,313 3,367 256% 101,194 200,364 5,670 16-Jun 2,080 2-Jun ADJUSTED (E) 4,167 317% 125,005 247,947

DRAINAGE USABLE END OF MO. CHANGE DURING RESERVOIR ABOVE DAM CAPACITY USABLE CONTENTS MONTH PREVIOUS (MI2) (AC-FT) (AC-FT) (AC-FT) MONTH MCPHEE RESERVOIR, MONTEZUMA COUNTY, CO 809 229,200 381,270 47,583 333,687 BLUE MESA RESERVOIR NEAR SAPINERO, COLORADO 3,426 829,500 695,800 248,600 447,200 FLAMING GORGE RESERVOIR AT FLAMING GORGE DAM, UT (b) 15,100 3,739,000 3,448,500 72,000 3,376,500 FONTENELLE RESERVOIR AT FONTENELLE , WYOMING (b) 4,280 344,300 260,800 56,700 204,100 NAVAJO RESERVOIR NEAR ARCHULETA, NEW MEXICO (b) 3,320 1,696,000 1,500,600 221,800 1,278,800 NIIP 35,800 LAKE POWELL RESERVOIR AT GLEN CANYON DAM, ARIZONA (b) 107,700 25,002,000 12,914,400 2,571,300 10,343,100

TOTALS 31,620,800 18,820,100 3,170,400 15,649,700 (a) Preliminary Data (b) Approximate PROVISIONAL DATA U.S. GEOLOGICAL SURVEY SUBJECT TO REVISION UTAH WATER SCIENCE CENTER STREAMFLOW AND RESERVOIR CONTENTS IN UPPER COLORADO RIVER BASIN DAYS IN contact 435-259-4430 or [email protected] MONTH July 2019 31 MONTHLY DISCHARGE (a) MAXIMUM DAILY MINIMUM DAILY (A)MEDIAN PERCENT TOTAL 3 3 3 3 3 STREAM ft /s MEAN ft /s 30 YEAR ft /s ACRE ft /s DATE ft /s DATE (1981-2010) THIS MONTH MEDIAN DAYS FEET COLORADO RIVER NR CISCO, UTAH 5,546 17,341 313% 538,526 1,066,281 31,300 3-Jul 9,950 31-Jul ADJUSTED (B) 19,403 350% 601,503 1,193,081 GREEN RIVER AT GREEN RIVER , UT 3,675 9,347 254% 290,277 574,748 18,100 3-Jul 3,870 31-Jul ADJUSTED (C) 11,128 303% 344,970 684,248 SAN JUAN RIVER NEAR BLUFF, UT 1,581 3,436 217% 106,700 211,265 6,230 3-Jul 1,960 31-Jul ADJUSTED (D) 4,693 297% 145,483 288,565

DOLORES RIVER NR CISCO, UTAH 444 1,378 310% 42,808 84,760 3,390 2-Jul 587 31-Jul ADJUSTED (E) 1,137 256% 35,243 69,904

DRAINAGE USABLE END OF MO. CHANGE DURING RESERVOIR ABOVE DAM CAPACITY USABLE CONTENTS MONTH PREVIOUS (MI2) (AC-FT) (AC-FT) (AC-FT) MONTH MCPHEE RESERVOIR, MONTEZUMA COUNTY, CO 809 229,200 366,414 -14,856 381,270 BLUE MESA RESERVOIR NEAR SAPINERO, COLORADO 3,426 829,500 822,600 126,800 695,800 FLAMING GORGE RESERVOIR AT FLAMING GORGE DAM, UT (b) 15,100 3,739,000 3,501,700 53,200 3,448,500 FONTENELLE RESERVOIR AT FONTENELLE , WYOMING (b) 4,280 344,300 317,100 56,300 260,800 NAVAJO RESERVOIR NEAR ARCHULETA, NEW MEXICO (b) 3,320 1,696,000 1,530,600 30,000 1,500,600 NIIP 47,300 LAKE POWELL RESERVOIR AT GLEN CANYON DAM, ARIZONA (b) 107,700 25,002,000 13,933,500 1,019,100 12,914,400

TOTALS 31,620,800 20,105,500 1,285,400 18,820,100 (a) Preliminary Data (b) Approximate PROVISIONAL DATA U.S. GEOLOGICAL SURVEY SUBJECT TO REVISION UTAH WATER SCIENCE CENTER STREAMFLOW AND RESERVOIR CONTENTS IN UPPER COLORADO RIVER BASIN DAYS IN contact 435-259-4430 or [email protected] MONTH August 2019 31 MONTHLY DISCHARGE (a) MAXIMUM DAILY MINIMUM DAILY (A)MEDIAN PERCENT TOTAL 3 3 3 3 3 STREAM ft /s MEAN ft /s 30 YEAR ft /s ACRE ft /s DATE ft /s DATE (1981-2010) THIS MONTH MEDIAN DAYS FEET COLORADO RIVER NR CISCO, UTAH 4,153 5,982 144% 179,769 355,943 10,100 1-Aug 3,460 30-Aug ADJUSTED (B) 5,169 124% 160,244 317,843 GREEN RIVER AT GREEN RIVER , UT 2,460 2,980 121% 92,527 183,203 3,810 1-Aug 2,410 31-Aug ADJUSTED (C) 1,958 80% 60,702 120,403 SAN JUAN RIVER NEAR BLUFF, UT 1,175 1,551 132% 48,164 95,364 1,900 4-Aug 1,230 22-Aug ADJUSTED (D) 1,055 90% 32,702 64,864

DOLORES RIVER NR CISCO, UTAH 273 357 131% 11,077 21,932 668 3-Aug 137 31-Aug ADJUSTED (E) -181 -66% -5,607 -11,122

DRAINAGE USABLE END OF MO. CHANGE DURING RESERVOIR ABOVE DAM CAPACITY USABLE CONTENTS MONTH PREVIOUS (MI2) (AC-FT) (AC-FT) (AC-FT) MONTH MCPHEE RESERVOIR, MONTEZUMA COUNTY, CO 809 229,200 333,360 -33,054 366,414 BLUE MESA RESERVOIR NEAR SAPINERO, COLORADO 3,426 829,500 784,500 -38,100 822,600 FLAMING GORGE RESERVOIR AT FLAMING GORGE DAM, UT (b) 15,100 3,739,000 3,458,000 -43,700 3,501,700 FONTENELLE RESERVOIR AT FONTENELLE , WYOMING (b) 4,280 344,300 298,000 -19,100 317,100 NAVAJO RESERVOIR NEAR ARCHULETA, NEW MEXICO (b) 3,320 1,696,000 1,458,500 -72,100 1,530,600 NIIP 41,600 LAKE POWELL RESERVOIR AT GLEN CANYON DAM, ARIZONA (b) 107,700 25,002,000 13,610,200 -323,300 13,933,500

TOTALS 31,620,800 19,609,200 -496,300 20,105,500 (a) Preliminary Data (b) Approximate PROVISIONAL DATA U.S. GEOLOGICAL SURVEY SUBJECT TO REVISION UTAH WATER SCIENCE CENTER STREAMFLOW AND RESERVOIR CONTENTS IN UPPER COLORADO RIVER BASIN DAYS IN contact 435-259-4430 or [email protected] MONTH September 2019 30 MONTHLY DISCHARGE (a) MAXIMUM DAILY MINIMUM DAILY (A)MEDIAN PERCENT TOTAL 3 3 3 3 3 STREAM ft /s MEAN ft /s 30 YEAR ft /s ACRE ft /s DATE ft /s DATE (1981-2010) THIS MONTH MEDIAN DAYS FEET COLORADO RIVER NR CISCO, UTAH 4,255 3,784 89% 113,715 225,156 4,190 18-Sep 3,240 7-Sep ADJUSTED (B) 2,965 70% 88,962 176,456 GREEN RIVER AT GREEN RIVER , UT 2,526 2,685 106% 80,685 159,755 2,990 17-Sep 2,410 7-Sep ADJUSTED (C) 1,429 57% 42,881 85,055 SAN JUAN RIVER NEAR BLUFF, UT 1,262 1,209 96% 36,323 71,920 1,570 2-Sep, 3-Sep 682 30-Sep ADJUSTED (D) 515 41% 15,437 30,620

DOLORES RIVER NR CISCO, UTAH 216 98 45% 2,946 5,832 170 13-Sep 57 30-Sep ADJUSTED (E) -447 -207% -13,401 -26,582

DRAINAGE USABLE END OF MO. CHANGE DURING RESERVOIR ABOVE DAM CAPACITY USABLE CONTENTS MONTH PREVIOUS (MI2) (AC-FT) (AC-FT) (AC-FT) MONTH MCPHEE RESERVOIR, MONTEZUMA COUNTY, CO 809 229,200 300,946 -32,414 333,360 BLUE MESA RESERVOIR NEAR SAPINERO, COLORADO 3,426 829,500 735,800 -48,700 784,500 FLAMING GORGE RESERVOIR AT FLAMING GORGE DAM, UT (b) 15,100 3,739,000 3,410,000 -48,000 3,458,000 FONTENELLE RESERVOIR AT FONTENELLE , WYOMING (b) 4,280 344,300 271,300 -26,700 298,000 NAVAJO RESERVOIR NEAR ARCHULETA, NEW MEXICO (b) 3,320 1,696,000 1,388,100 -70,400 1,458,500 NIIP 29,100 LAKE POWELL RESERVOIR AT GLEN CANYON DAM, ARIZONA (b) 107,700 25,002,000 13,277,400 -332,800 13,610,200

TOTALS 31,620,800 19,082,600 -526,600 19,609,200 (a) Preliminary Data (b) Approximate Dolores River near Cisco, UT Monthly Mean Discharge (cubic feet per second) 4,000

3,500 3,367

3,000

2,500 2,428

2,186 2,000

1,500

DISCHARGE (cubic feet per second) 1,378

1,000

500 377 357

138 123 92 82 99 98 0 OCT-18 NOV-18 DEC-18 JAN-19 FEB-19 MAR-19 APR-19 MAY-19 JUN-19 JUL-19 AUG-19 SEP-19

Dolores River near Cisco, Utah (CFS) WY 2019 Monthly Mean Discharge Dolores River near Cisco, Utah (CFS) 1981-2010 Median Monthly Discharge Colorado River near Cisco, UT Monthly Mean Discharge (cubic feet per second) 35,000

30,000 28,983

25,000

20,000

17,341

15,000 14,572 DISCHARGE (cubic feet per second)

10,000

7,882

5,982 5,000 3,784 3,202 3,492 2,657 2,279 2,246 2,457

0 OCT-18 NOV-18 DEC-18 JAN-19 FEB-19 MAR-19 APR-19 MAY-19 JUN-19 JUL-19 AUG-19 SEP-19

WY 2019 Monthly Mean Discharge 1981-2010 Median Monthly Discharge Green River at Green River, UT Monthly Mean Discharge (cubic feet per second) 25,000

21,915

20,000

15,000

11,593

10,000 9,347 DISCHARGE (cubic feet per second)

6,005 5,000

3,423 2,980 2,743 2,766 2,851 2,859 2,685 2,366

0 OCT-18 NOV-18 DEC-18 JAN-19 FEB-19 MAR-19 APR-19 MAY-19 JUN-19 JUL-19 AUG-19 SEP-19

WY 2019 Monthly Mean Discharge 1981-2010 Median Monthly Discharge San Juan River near Bluff, UT Monthly Mean Discharge (cubic feet per second) 7,000

6,281 6,000

5,000

4,000

3,436

3,000

2,563 DISCHARGE (cubic feet per second)

2,000 1,895 1,970

1,551

1,209 1,000 794 649 605 521 566

0 OCT-18 NOV-18 DEC-18 JAN-19 FEB-19 MAR-19 APR-19 MAY-19 JUN-19 JUL-19 AUG-19 SEP-19

WY 2019 Monthly Mean Discharge 1981-2010 Median Monthly Discharge Estimated Flow at Confluence Sum of Colorado River near Cisco, UT and Green River at Green River, UT Monthly Mean Discharge (cubic feet per second) 60,000

50,898 50,000

40,000

30,000

26,165 26,689

DISCHARGE (cubic feet per second) 20,000

13,887

10,000 8,961 6,915 5,945 6,469 5,023 5,045 5,097 5,316

0 OCT-18 NOV-18 DEC-18 JAN-19 FEB-19 MAR-19 APR-19 MAY-19 JUN-19 JUL-19 AUG-19 SEP-19

WY 2019 Monthly Mean Discharge 1981-2010 Median Monthly Discharge Acre-feet 100,000 150,000 200,000 250,000 50,000 0 OCT 7,058 - 18 14573 NOV 5,473 - 18 11627 DEC 5,044 - 18

WY 2019 Monthly TotalWY (ac-ft) 2019Monthly 10437 Total Monthly Discharge (ac Dolores River Cisco, near Utah JAN 6,113 - 19 9828 FEB 7,654 - 19 11662 MAR 23,208 1981-2010 Median Total1981-2010 (ac-ft) Monthly - 19 22141 APR 130,089 - 19 91118 MAY -

149,319 ft) - 19 129312 JUN 200,364 - 19 80755

JUL 84,760 - 19 27311 AUG 21,932 - 19 16763 SEP 5,832 - 19 13254 Acre-feet 1,000,000 1,200,000 1,400,000 1,600,000 1,800,000 2,000,000 200,000 400,000 600,000 800,000 0 OCT 196,878 - 18 267,840 NOV 158,075 - 18 243,238 DEC 140,111 - 18 WY 2019 Monthly TotalWY (ac-ft) 2019Monthly 223,002 Colorado RiverCisco, near Utah Total Monthly Discharge (ac JAN 138,088 - 19 204,481 FEB 136,455 - 19 185,365 MAR

1981-2010 Median Total1981-2010 (ac-ft) Monthly 214,709 - 19 241,949 APR 469,034 - 19 404,736 MAY -

896,010 ft) - 19 775,050 JUN 1,724,615 - 19 821,674

JUL 1,066,281 - 19 341,149 AUG 355,943 - 19 255,440 SEP 225,156 - 19 253,258 Acre-feet 1,000,000 1,200,000 1,400,000 200,000 400,000 600,000 800,000 0 OCT 168,362 - 18 181,100 NOV 140,782 - 18 177,657 DEC 164,611 - 18 WY 2019 Monthly TotalWY (ac-ft) 2019Monthly 145,259 Green River atGreen River, Utah Total Monthly Discharge (ac JAN 175,312 - 19 153,681 FEB 158,770 - 19 159,276 MAR

1981-2010 Median Total1981-2010 (ac-ft) Monthly 210,459 - 19 233,120 APR 357,308 - 19 311,984 MAY -

712,819 ft) - 19 715,629 JUN 1,304,034 - 19 734,973

JUL 574,748 - 19 226,077 AUG 183,203 - 19 151,280 SEP 159,755 - 19 150,348 Acre-feet 100,000 150,000 200,000 250,000 300,000 350,000 400,000 50,000 0 OCT 39,924 - 18 75,729 NOV 35,978 - 18 67,605 DEC 32,027 - 18

WY 2019 Monthly TotalWY (ac-ft) 2019Monthly 62,694 Total Monthly Discharge (ac San Juan Rivernear Bluff,Utah JAN 34,783 - 19 63,081 FEB 44,086 - 19 67,615 MAR 116,529 1981-2010 Median Total1981-2010 (ac-ft) Monthly - 19 77,594 APR 117,211 - 19 105,092 MAY -

157,621 ft) - 19 258,813 JUN 373,773 - 19 233,914

JUL 211,265 - 19 97,236 AUG 95,364 - 19 72,297 SEP 71,920 - 19 75,114 AC-FT 1,000,000 1,500,000 2,000,000 2,500,000 3,000,000 3,500,000 4,000,000 500,000 0

Oct-18 405,164

524,669 Nov-18 334,835

488,500 SUM OF MAJOR INFLOWSSUM OF MAJOR TO POWELL LAKE Dec-18 336,749

WY 2019 Monthly TotalWY (ac-ft) 2019Monthly 430,955 Total Monthly Discharge (ac

Jan-19 348,183

421,243

Feb-19 339,312

412,255 Mar-19

1981-2010 Median Total1981-2010 (ac-ft) Monthly 541,697

552,663

Apr-19 943,553

821,812 May-19 -

1,766,449 ft)

1,749,491

Jun-19 3,402,421

1,790,560

Jul-19 1,852,294

664,461 Aug-19 634,511

479,017

Sep-19 456,831

478,719 Dolores River near Cisco, UT Total Monthly Discharge as Percent of 30 year (1981-2010) Median 400

350

310.4 300

250 248.1

200 Percent

150 142.8 130.8 115.5 100 104.8

62.2 65.6 50 48.4 47.1 48.3 44.0

0 OCT-18 NOV-18 DEC-18 JAN-19 FEB-19 MAR-19 APR-19 MAY-19 JUN-19 JUL-19 AUG-19 SEP-19

Dolores River near Cisco, Utah Colorado River near Cisco, UT Total Monthly Discharge as Percent of 30 year (1981-2010) Median 400

350

312.6 300

250

209.9 200 Percent

150 139.3

115.9 115.6 100 88.7 88.9 73.5 73.6 67.5 65.0 62.8 50

0 OCT-18 NOV-18 DEC-18 JAN-19 FEB-19 MAR-19 APR-19 MAY-19 JUN-19 JUL-19 AUG-19 SEP-19

Colorado River near Cisco, Utah Green River at Green River, UT Total Monthly Discharge as Percent of 30 year (1981-2010) Median 300

254.2 250

200

177.4

150 Percent

121.1 113.3 114.1 114.5 106.3 100 99.7 99.6 93.0 90.3 79.2

0 OCT-18 NOV-18 DEC-18 JAN-19 FEB-19 MAR-19 APR-19 MAY-19 JUN-19 JUL-19 AUG-19 SEP-19

Green River at Green River, Utah San Juan near Bluff, UT Total Monthly Discharge as Percent of 30 year (1981-2010) Median 300

250

217.3

200

159.8 150 150.2 Percent 131.9

111.5 100 95.7

65.2 60.9 55.1 50 52.7 53.2 51.1

0 OCT-18 NOV-18 DEC-18 JAN-19 FEB-19 MAR-19 APR-19 MAY-19 JUN-19 JUL-19 AUG-19 SEP-19

San Juan River near Bluff, Utah SUM OF FLOWS TO LAKE POWELL TOTAL MONTHLY DISCHARGE AS PERCENT OF 30 YEAR (1981-2010) MEDIAN 300 279

250

200 190

150

Percent 132

115

101 98 95 100 83 82 77 78 69

0 Oct-18 Nov-18 Dec-18 Jan-19 Feb-19 Mar-19 Apr-19 May-19 Jun-19 Jul-19 Aug-19 Sep-19 7,000,000

6,112,423 6,000,000

5,000,000

4,361,864

4,000,000 FEET -

ACRE 3,089,658 3,000,000

2,374,160

2,001,459 2,000,000 1,762,586

1,000,000 648,605 597,819 479,772 301,185

0 Dolores River near Cisco, UT Colorado River nr Cisco, UT Green River at Green River, UT San Juan River nr Bluff, UT Sum of Major Inflow to Lake Powell

Apr-Jun WY 2019 Total Discharge (ac-feet) 1981-2010 Median Apr-Jun Total Discharge (ac-feet) Apr-Jun Total Discharge as Percent of 30 year Median (1981-2010)

200

180

160 159 154

140 140 135

P 120 e 108 r c 100 e n t 80

0 DOLORES RIVER NEAR CISCO, COLORADO RIVER NR CISCO, GREEN RIVER AT GREEN SAN JUAN RIVER NR BLUFF, SUM OF MAJOR INFLOW TO UT UT RIVER, UT UT LAKE POWELL 12,000,000 Annual Total Discharge (ac-ft) 11,361,999

10,000,000

8,814,347

8,000,000 FT - 6,000,000 5,721,355 AC

4,217,180 4,310,163 4,000,000 3,340,381

2,000,000 1,330,481 1,256,785

646,847 438,783

0 Dolores River near Cisco, UT Colorado River nr Cisco, UT Green River at Green River, UT San Juan River nr Bluff, UT Sum of Major Inflow to Lake Powell Annual Total WY 2019 Total Discharge (ac-feet) 1981-2010 Median Annual Total Discharge (ac-feet) Annual Total Discharge as Percent of 30 year Median (1981-2010)

200

180

160

147

140 136 129 129

120 106

100 PERCENT

0 DOLORES RIVER NEAR CISCO, COLORADO RIVER NR CISCO, GREEN RIVER AT GREEN SAN JUAN RIVER NR BLUFF, SUM OF MAJOR INFLOW TO UT UT RIVER, UT UT LAKE POWELL

Annual Total Discharge as Percent of 30 year Median (1981-2010)