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.. <br /> COLORADO BASIN <br /> Basinwide Conditions Assessment: <br /> The SWSI value of-1.6 indicates that the basin water SURFACE WATER SUPPLY INDEX <br /> awn <br /> supply is considerably below normal. It is the lowest value in 5 -- `°'""'°°R'"" <br /> the state. Snowpack measured 75% of average on February 4- - <br /> 1, 1991. Precipitation for the month of January was 71% of : <br /> normal, and is on a three month decline. Flow at the key • 3- .:` r <br /> 2 <br /> gaging station, Colorado River near Dotsero, averaged 737 cfs - - -- <br /> as compared to the historic monthly average of 973 cfs. Base 1- : L' <br /> flows are critically low in tributaries to the Colorado River due _ ° - `"' "' t- � <br /> to colder than normal temperatures and resulting low _,- r � �';snowpack runoff. Basinwide reservoir storage was 85% of _ _ �`'�,,`'- <br /> average on February 1, 1991. Dillon Reservoir,Williams Fork o - I - .1 <br /> Reservoir, and Ruedi Reservoir have near normal storage _3- <br /> levels. Vega Reservoir, Rifle Gap Reservoir, Green Mountain -4 <br /> JAN81 JAN02 JANB3 JAN84 JAM85 JAN86 JAMB] JAN88 JANB9 JAN89 JANE1 <br /> Reservoir, and Granby Reservoir have storage contents well tONTW YEAR <br /> below normal. Granby Reservoir contents (useable)measured <br /> 154,200 acre-feet on February 1, 1991, compared to the <br /> - historic seasonal average of 268,900 acre-feet, and a capacity <br /> of 465,600 acre-feet. <br /> �,�]] ]]�� COLORADO RIVER NR. DOTSERO <br /> Outlook: 500 FLO5 8Y WATER YEAR <br /> Snowpack is likely to be low going into the 1991 430 <br /> runoff season unless significantly above average snowfall is <br /> 400 <br /> received in the February-April period. Streamflow forecast is 1 <br /> lowest in the Williams Fork drainage at 62% of average and i 3SO " <br /> highest in the Fryingpan River drainage above Reudi Reservoir � 300 <br /> at 83% of average. .g 250 <br /> z00 . <br /> Adrninistrative/Management Concerns: <br /> 150 - <br /> The "Dotsero" call (January 7, 1902 decree) to satisfy <br /> the Shoshone Hydroelectric Power Plant water right of 1250 '°° <br /> cfs, will be on throughout the winter. It is expected that the s° <br /> oci .,„ 0aa Jan Fab March <br /> "Cameo" call (March 21, 1911 decree) will control the lower SOWN <br /> Colorado River during the 1991 irrigation season. YGR(19M) 1. oRY TEAR[197� o e Me <br /> Public Use Impacts: <br /> Snowmaking is playing an increasing role in winter <br /> water use demands. These demands compete with the needs Colorado River Basin Reservoir Supplies <br /> of hydroelectric power,municipalities,stock watering,storage, 00 <br /> and maintaining minimum stream flows. Snowmaking rights 70 j // <br /> are typically junior except in the case of minimum stream V <br /> flows. This water use during low flow periods is a major i 50 <br /> concern relative to impacts on stream fisheries. 50 <br /> P _,//\ <br /> • 40..../\\ <br /> Mr, 3° <br /> e <br /> 7'.\\\ <br /> • 20 /\ <br /> 10 7\ <br /> 0 /\ /\ <br /> (}aan Yauntaln Rued 41l llama Fork <br /> ® AVp. 1/31 Contents ® 1/31/91 Contents <br /> 7 <br />