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COLORADO BASIN <br /> Basinwide Conditions Assessment: <br /> The SWSI value of-0.7 indicates that the basin water SURFACE WATER SUPPLY I NDEX <br /> supply is slightly below normal. Snowpack measured only s Colorado R11er%sin <br /> 63% of normal on December 1, 1990. Unseasonably warm ,_ <br /> temperatures resulted in significant snowpack reduction7 t <br /> during the month. Precipitation for the month of November '- <br /> was 96% of normal. Flow at the key gaging station, '- =.. , L. <br /> Colorado River near Dotsero, averaged 987 cfs as compared g 1- -�--�- <br /> to the historic monthly average of 1162 cfs. Base flows are o .--�- -� <br /> critically low in tributaries to the Colorado River. Basinwide <br /> reservoir storage was 87% of normal on December 1, 1990. • <br /> Di lon Reservoir, Williams Fork Reservoir, and Ruedi o "s" c I. <br /> I. <br /> Reservoir are at near normal storage levels. Vega Reservoir, -"- t <br /> Rifle Gap Reservoir, Green Mountain Reservoir, and Granby -• <br /> With .NW' JAN.e 4265 JAMS JAN"7 JANM .w+w ''ANY° JAN11 <br /> Reservoir have storage contents well below normal. <br /> normal to above normal runoff, these reservoirs will fill in <br /> the spring of 1991. The exceptions are Green Mountain <br /> Reservoir and Granby Reservoir. Green Mountain Reservoir <br /> ended the irrigation season with 64,340 acre-feet of useable <br /> contents of which only 3,000 acre-feet is in the historic users COLORADO RIVER NR. DOTSERO <br /> pool. The remainder was in the Colorado Big Thompson <br /> project pool and the West Slope contract pool. <br /> "Y <br /> Outlook: <br /> Snowpack is likely to be significantly low going into <br /> 1991 due to lack of storm opportunities and unseasonably <br /> warm temperatures causing snowpack reductions. <br /> a <br /> Administrative/Managernent Concerns: <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. 0 <br /> Y1-'M IOV.AVNA9! fGM. 1220 <br /> Public Use Impacts: <br /> Snowmaking is playing an increasing large role in <br /> winter water use demands. These demands compete with <br /> the needs of hydroelectric power, municipalities, stock <br /> watering, storage, and maintaining minimum stream flows. Co I orado River Basin Reservoir Supplies <br /> Snowmaking rights are typically junior except in the case of 100 <br /> minimum stream flows. This water use during low flow s <br /> periods is a major concern. p 'off <br /> ki .//-\ <br /> so <br /> X 40 <br /> 1 30 <br /> 20_./\ <br /> 0 A\ //‘ <br /> Crean Maintain Ruin V1111Ys Fork <br /> ® Avg. 11/30 Contents - ® 1V3W90 Contents <br /> 7 <br />