Water Quality Monitoring

Report Illinois River Basin - Compact

ARK04A Flint Creek near West Siloam Springs ARK05 Sager Creek near Siloam Springs ¤£71 ARK06 Illinois River South of Siloam Springs (!102 ARK07A Barren Fork at Dutch Mills (!12 ! Rogers Watts Illinois River near Watts (!94 ¤£71 Tahlequah Illinois River near Tahlequah (!112 Kansas Flint Creek near Kansas (!59 633)" 12 Eldon Barren Fork near Eldon 43 (! 264 (! (! ¤£71 ARK04A k )"60 k Benton ree nt Cr ee )" C )"76 Kansas li e ! F Siloam Springs ag Springdale )" Os 934 ! )"Kansas ARK05 ! )" Delaware ARK06A 703 Watts )" )"54 )" )" 59 (!16 (! er Watts ! )" ARK06 iv (!180 R Adair Lake (!244 (!265 ois Francis I ! lin l Fayetteville l Washington l 16 I i (! £59 n ¤ o 10 (! O A is r 33 k )" k Cherokee Westville l R ! a a iv h n er B o s 261 62 a a ¤£ rren Fo m )" rk s ! 28 82 C a 212 )" (! Eldon Lincoln )" r 403 Tahlequah )" ! Eldon ee )" 156 ! )" k 59 (! !51 Tahlequah (! (!45 ( (!265 )" ARK07A (!170 (!51 ¤£62 Creek ey (!82 n a !Stilwell C 100 (!

Crawford

82 (! EXPLANATION r le il Counties k n e T Lakes

e Highways k a L 100 River / Stream (! Scenic River ") Stations Sequoyah ! Cities 0510Miles (!10 ¤£64 ¨¦§40

200,000 180,000 160,000 140,000 120,000 100,000 80,000 60,000 40,000 20,000 0 Flint Ck ARK04A Sager Ck ARK05 Illinois R. ARK06 Baron Fk ARK07A Total P 80‐93 3,267 17,566 190,577 7,160 Total P 94‐98 2,488 12,133 130,567 4,519 Total P 95‐99 2,555 14,284 134,951 4,874 Total P 96‐00 2,187 16,796 126,713 4,571 Total P 97‐01 2,213 18,008 131,495 4,002 Total P 98‐02 2,043 19,332 142,446 4,354 Total P 99‐03 2,019 20,798 125,156 3,792 Total P 00‐04 2,106 22,418 115,417 3,661 Total P 01‐05 2,049 22,616 98,479 2,777 Total P 02‐06 1,855 24,905 72,654 3,274 Total P 03‐07 1,707 25,113 56,817 3,062 Total P 04‐08 2,848 31,649 69,349 4,145 Total P 05‐09 2,723 34,345 67,883 4,237 Total P 06‐10 2,762 32,462 65,668 4,267 Total P 07‐11 3,102 28,313 81,467 3,678 Total P 08‐12 2,919 20,984 70,853 3,156 Total P 09‐13 1,794 13,856 51,777 1,898 Total P 10‐14 1,551 7,661 44,170 1,347 Total P 11‐15 1,825 5,710 49,406 1,559 Total P 12‐16 1,761 3,789 33,473 1,276 Total P 13‐17 1,946 5,083 45,502 1,193

*Values represent all available data routinely collected. Targeted high flows excluded beginning 2016.

Arkansas-Oklahoma Compact – State of Arkansas Environmental Review Page 1

- I E L L E S E F Y A R A U A V A U V N N 1,946 1,761 1,825 % Decrease 1,551 1,794 2,919 3,102 2,762 40% Reduction 2,723 1,960 2,848 1,707 1,855 Base LineBase 80-93 2,049 3,267 2,106 Year Pt (mg/l) Flow (cfs) Pt (kg/yr) 2,019 2,043 Rolling 5 year 2,213 Flint Creek NorthwestSiloam Springs of West 2,187 2,555 2,488 2,875 2,797 3,014 4,000 3,000 2,000 1,000

I L S S L A U A P A G P R U N N H O O D N Year per kg in Load H O Flint Creek Northwest of Siloam Springs, Arkansas (kg/yr) Total P (mg/L) Total P (cfs) Flow Flow 19.8029.90 0.14919.00 0.17153.50 2,635 0.07391.30 4,566 0.11278.40 1,239 0.06358.30 5,351 0.06741.80 5,137 0.04938.00 4,691 0.03171.30 2,551 0.05051.60 1,157 0.06056.10 1,697 0.05488.20 3,821 0.04753.00 2,489 0.04561.30 2,355 0.05133.50 3,545 0.07537.30 2,414 0.05042.90 4,106 0.07463.50 1,496 0.05655.60 2,448 0.04539.40 2,142 0.03844.56 2,578 0.04721.40 1,893 0.04764.60 1,636 0.075 91-9543.02 1,850 0.055 92-9612.60 1,438 0.046 0.054 93-9722.40 3,173 0.056 0.054 94-9876.90 1,772 0.059 0.059 95-99 62.055.60 58.42 0.147 0.061 96-00 630 44.30 1,180 54.66 0.054 0.060 97-0148.50 10,096 45.60 0.049 0.053 98-02 3,01419.20 2796.6 2,681 47.70 0.042 0.052 99-0345.09 2875.3 1,939 46.56 0.043 0.046 00-04 14.4%30.70 2487.5 7.7% 1,798 47.74 0.049 0.050 01-05 12.0%78.50 2554.8 49.19 0.049 0.052 02-06 732 23.9%32.20 2187.1 1,973 44.89 0.048 0.054 03-07 21.8%39.92 2212.7 1,343 45.11 0.051 0.056 04-08 33.1%47.65 2042.7 3,365 42.60 0.044 0.058 05-09 32.3% 2019.1 1,467 37.24 0.063 0.073 06-10 37.5% 2105.9 1,554 32.80 0.072 07-11 38.2% 2049.2 2,668 43.90 0.073 08-12 35.5% 1854.5 42.10 0.070 09-13 37.3% 1707.1 42.36 0.067 10-14 43.2% 2847.6 49.54 0.047 11-15 47.7% 2723.3 48.90 0.046 12-16 12.8% 2761.7 42.54 0.046 13-17 16.6% 3101.5 37.56 0.048 15.5% 2918.8 44.40 0.048 1794.5 5.1% 41.14 10.7% 1550.8 45.28 45.1% 1825.3 52.5% 1761.1 44.1% 1946.0 46.1% 40.4%

Arkansas-Oklahoma Compact – State of Arkansas Environmental Review Page 2

TP Discrete Measurements (mg/L) (Log Scale) 0.10 0.01 0.00 0.037 0.0370 mg/lGoal 0.0370 mg/lGoal mg/L)PLinear (Total Station ID: ARK0004A ID: Station Flint Creek NorthwestofWest Siloam Springs,Oklahoma 3 Month Geometric Mean P P (mg/L) Mean Geometric 3 Month mg/L Total P Linear (mg/L)) (3 Mean Geometric P Month Total Phosphorus (TP) and Scenic River Criterion Implementation (1997 - (1997 Implementation Criterion River Scenic and (TP) 2017) Phosphorus Total

0.5 0.4 0.3 0.2 0.1 0.0 3 Month Rolling Geometric Mean of TP (mg/L) TP of Mean Geometric Rolling Month 3 0.037

Arkansas-Oklahoma Compact – State of Arkansas Environmental Review Page 3

5,083 I - F E E L L E S V Y A R A U A V A U N N 3,789 5,710 % 7,661 Decrease 13,856 20,984 28,313 40% Reduction 32,462 34,345 31,649 25,113 10,540 24,905 Pt (mg/l) Flow (cfs) Pt (kg/yr) Base Line 80-93 Line Base 22,616 22,418 Year 12-16 0.202 21.03 3,789 78.4% 20,798 19,332 Sager Creek near West Siloam Springs Siloam West Creek near Sager Rolling 5 year Rolling 18,008 16,796 14,284

12,133 17,566 12,426 13,021 13,689

8,000 3,000

33,000 28,000 23,000 18,000 13,000

I L S S L A U A P A G P R U N N H O O D N H O Load in Kg per Year per Kg in Load Sager Creek near West Siloam Springs, Arkansas (kg/yr) Total P (mg/L) Total P (cfs) Flow Flow Avg. 20.12 0.9958 17,891 19911982 6.501983 9.001984 2.125 6.301985 15.40 2.0251986 12,336 24.80 1.9641987 16,277 0.95 21.101988 1.736 11,050 16.701989 0.834 13,066 12.60 38,4501990 0.948 11.70 15,7161991 1.154 20.20 14,1361992 1.227 15.50 12,9861993 0.86 16.50 12,8211994 0.914 24.601995 1.284 15,515 15.70 12,6531996 0.637 17.80 18,9211997 0.721 11.00 13,9951998 0.697 17.80 10,1101999 0.919 18.10 11,080 1.02872000 24.50 9,028 0.85842001 16,354 30.70 0.97942002 13,876 21.20 0.8195 21,429 21.82 0.8028 22,469 1.192 15,201 91-95 92-96 23,231 0.851 93-97 0.852 94-98 95-99 18.02 0.801 96-00 0.845 17.12 0.896 97-01 17.38 13,689 0.921 98-02 16.08 17.84 13,021 0.898 99-03 22.1% 20.42 12,426 0.930 00-04 12,133 25.9% 22.46 1.059 01-05 14,284 29.3% 23.26 02-06 16,796 1.047 30.9% 21.98 1.175 18.7% 03-07 18,008 1.374 04-08 19,332 4.4% 23.98 21.55 1.397 -2.5% 05-09 20,798 20.29 -10.1% 1.285 06-10 22,418 07-11 20.13 -18.4% 1.359 22,616 08-12 27.57 24,905 -27.6% 1.247 1.001 09-13 28.29 -28.7% 25,113 0.790 10-14 -41.8% 31,649 29.16 31.66 0.647 11-15 -43.0% 34,345 0.429 29.74 -80.2% 0.275 23.99 32,462 -95.5% 28,313 20.01 20,984 23.25 -84.8% -61.2% 13,856 -19.5% 7,661 21.1% 5,710 56.4% 67.5% 20032004 11.702005 34.50 1.50252006 18.552007 0.916 15,700 14.90 1.46092008 21.00 28,224 2009 1.799 24,200 48.902010 1.306 38.10 23,940 2011 0.945 22.90 24,494 2012 1.286 27.40 41,271 0.89652013 11.40 43,759 0.57322014 18,335 20.16 0.24952015 14,027 18.202016 0.228 2,540 39.10 0.19642017 16.30 4,105 0.128 3,193 21.72 0.207 0.4732 4,470 3,013 9,179 13-17 0.246 23.096 5,083 71.1% Year ARK05 ARK05 Arkansas-Oklahoma Compact – State of Arkansas Environmental Review Page 4

Arkansas-Oklahoma Compact – State of Arkansas Environmental Review Page 5

45,502 - I E L L E S E F Y A R A U A V A U V N N 33,473 49,406 % 44,170 Decrease 51,777 70,853 81,467 65,668 40% Reduction 67,883 69,349 114,346 56,817 72,654 Pt (mg/l) Base Line 80-93 Line Base 98,479 190,577 115,417 Year Flow (cfs) Pt (kg/yr) 125,156 142,446 Rolling 5 year Rolling 5 Illinois River South of Siloam Springs of Siloam South River Illinois 131,495 126,713 134,951 130,567 141,386 152,527 153,942

65,000 30,000

205,000 170,000 135,000 100,000 I Year per Kg in Load L S S L U A P A G A P R U N N H O O D N H O Illinois River South of Siloam Springs, Arkansas (kg/yr) Total P (mg/L) Total P (cfs) Flow Flow Avg. 656.57 0.204 119,572 Year 19811982 197.001983 591.00 0.4201984 352.00 0.3701985 73,895 706.00 0.386 195,2941986 947.00 0.442 121,3471987 879.00 0.289 278,6931988 815.00 0.305 244,4261989 531.00 0.294 239,4361990 558.00 0.253 213,9961991 1127.00 0.291 119,9821992 0.204 724.00 145,0201993 760.00 205,331 0.2201994 1163.00 0.222 142,2531995 0.181 674.00 150,6841996 783.00 188,000 0.1901997 667.00 0.237 114,3701998 497.00 0.225 165,7331999 668.00 0.213 134,0322000 737.00 0.2462001 94,504 597.00 0.206 146,9602002 598.00 0.230 135,4132003 570.40 0.293 122,8312004 91-95 344.00 92-96 0.282 156,5812005 633.00 93-97 0.219 0.210 143,7002006 436.18 0.211 94-98 0.1532007 67,422 289.70 0.209 820.80 95-99 0.1202008 809.40 86,496 436.10 0.222 96-00 0.1202009 756.80 1051.00 46,785 153,942 0.225 97-01 0.131 152,5272010 657.80 0.158 31,048 906.70 0.224 98-02 19.2% 141,3862011 670.40 51,022 658.70 0.238 148,306 20.0% 99-03 0.080 130,5672012 633.20 1096.80 00-04 0.252 25.8% 0.061 134,9512013 619.40 0.120 64,782 342.70 0.246 31.5% 01-05 126,713 0.2362014 634.08 35,885 582.61 117,154 29.2% 02-06 0.070 131,4952015 569.28 03-07 425.80 0.214 33.5% 548.48 0.073 142,4462016 21,547 983.80 0.179 31.0% 04-08 0.074 125,156 0.1492017 516.32 37,984 417.70 115,417 25.3% 05-09 0.066 454.66 28,014 546.91 0.136 34.3% 427.80 06-10 0.057 39.4% 98,479 57,990 0.122 0.043 569.20 07-11 72,654 21,264 0.110 08-12 56,817 48.3% 623.94 21,003 09-13 0.110 61.9% 668.44 69,349 0.098 70.2% 10-14 67,883 0.081 829.86 11-15 63.6% 811.18 65,668 0.080 12-16 64.4% 717.50 0.081 81,467 65.5% 621.32 13-17 70,853 0.068 686.34 51,777 57.3% 0.086 62.8% 550.52 44,170 72.8% 49,406 591.36 76.8% 33,473 74.1% 45,502 82.4% 76.12% ARK06 ARK06 Arkansas-Oklahoma Compact – State of Arkansas Environmental Review Page 6

Arkansas-Oklahoma Compact – State of Arkansas Environmental Review Page 7

1,193 - I E L L E S E F Y A R A U A V A U V N N 1,276 1,559 % Decrease 1,347 1,898 3,156 Pt (kg/yr) 3,678 4,267 40% Reduction 4,237 Flow (cfs) Flow 4,145 3,062 Pt (mg/l) 3,274 4,296 2,777 7,160 Base Line 80-93 Line Base Year 3,661 3,792 Baron Forkat Dutch Mills 4,354 4,002 Rolling 5 year Rolling 4,571 4,874 4,519 5,036 5,899 5,632

7,000 6,000 5,000 4,000 3,000 2,000 1,000

I S S L L P R U A U A P A G H O N N H O O D N Baron Fork at Dutch Mills, , Arkansas Load in Kg per Year per Kg in Load (kg/yr) Total P (mg/L) Total P (cfs) Flow Flow Avg. 46.63 0.109 4,523 Year 19811982 18.401983 37.401984 0.135 27.201985 0.484 51.80 2,2181986 0.125 79.40 16,1671987 0.183 64.00 3,0371988 0.211 63.20 8,4661989 0.147 31.80 14,9621990 0.134 50.20 8,4021991 0.097 102.00 7,5631992 0.124 49.40 0.109 2,7551993 47.90 5,5591994 0.086 9,929 104.001995 0.127 37.00 0.083 3,7941996 54.20 5,4331997 0.081 7,709 64.401998 0.162 35.90 2,6771999 0.084 61.10 7,8422000 0.067 45.80 4,8312001 0.107 52.60 2,1512002 0.102 41.40 5,8222003 0.133 37.99 4,1762004 0.065 20.10 91-95 6,2302005 0.104 92-96 44.50 2,3872006 0.133 0.108 26.07 93-97 3,536 0.1072007 0.087 62.00 94-98 2,3862008 0.069 95-99 58.50 0.095 32.30 61.50 3,458 2009 0.088 0.100 86.00 96-00 1,595 0.1042010 0.087 59.10 62.30 97-01 5,632 4,873 2011 0.132 50.52 5,899 0.099 37.10 98-02 52.28 2,510 2012 0.066 0.095 40.20 10,138 99-03 5,036 21.3% 2013 0.054 00-04 51.96 17.6% 0.102 19.70 4,519 3,672 2014 0.060 47.36 4,874 0.107 26.33 01-05 29.7% 1,789 0.1042015 0.048 47.78 17.80 02-06 4,571 36.9% 2,161 2016 0.058 03-07 39.58 31.9% 0.091 63.00 4,002 39.322017 0.049 845 0.096 15.50 04-08 4,354 36.2% 1,364 0.093 0.050 34.01 15.20 05-09 3,792 44.1% 0.050 778 38.13 3,661 0.093 06-10 39.2% 36.99 2,813 0.039 0.088 07-11 2,777 47.0% 692 50.17 48.9% 0.085 08-12 3,274 532 53.73 3,062 0.080 09-13 61.2% 55.94 0.072 10-14 4,145 54.3% 51.58 57.2% 0.057 11-15 4,237 49.06 0.053 12-16 4,267 42.1% 37.13 0.052 13-17 3,678 40.8% 28.23 0.050 3,156 40.4% 33.41 0.048 1,898 48.6% 28.47 1,347 55.9% 27.57 1,559 73.5% 1,276 81.2% 1,193 78.2% 82.2% 83.3% ARK06 ARK06 Arkansas-Oklahoma Compact – State of Arkansas Environmental Review Page 8

Arkansas-Oklahoma Compact – State of Arkansas Environmental Review Page 9