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COLORADO BASIN Sep - 08 Basinwide Conditions Assessment The S WSI value for the month was + 1.9 . Flow at COLORADO BASIN SWSI HISTORY the ga u g ing station Colorado River near Dotsero was 1709 4 cfs, as compared to the long - term average of 1771 cfs. Storage in Green Mountain, Ruedi, and Williams Fork 3 reservo irs totaled 112 % of normal as of the end of August . 2 DRY INDEX VALUE WET Outlook 1 Upper Fryingpan River flow fel l sharply in late August well below average and in violation of minimum 0 stream flow requirements. However, continued above - -1 average flows in the upper Roaring Fork and Crystal River have maintained the lower Roaring Fork River at above -2 average flows, contri buting to continued above average flows on the Colorado River . Blue and Eagle R iver flows -3 have fallen to at or below average throughout August. -4 Jan-99 Jan-00 Jan-01 Jan-02 Jan-03 Jan-04 Jan-05 Jan-06 Jan-07 Jan-08 MONTH / YEAR Administrative/Management Concerns Dillon Reservoir spilling from moderate precipitation COLORADO RIVER NR. DOTSERO, FLOW BY WATER YEAR in the upper Bl ue River Basin and discontinued Roberts Tunnel diversions resulted in increased Green Mountain 3,500,000 Reservoir releases in late August. Additionally, a declared Historic Users Pool surplus has lead to further releases 3,000,000 CUMULATIVE FLOW, Acre-Feet contributing to above average Colorado River flows. Green 2,500,000 Mountain reservoir’s 1935 power right imposed a call on the th Blue River on August 18 . The Colorado River continues to 2,000,000 have no calls from Grand Valley Irrigators. 1,500,000 Public Use Impacts 1,000,000 A flushing of the lower Fryingpan River near the conflue nce with the Roaring Fork River considered by the 500,000 Division of Wildlife following last years mud flow was deferred 0 pending runoff this past Spring. Flushing of the c hannel was Oct Nov Dec Jan Feb March April May June July Aug Sept accomplished by mid - June flows which exceeded 600 cfs as part of the fish recover y program near Grand Junction. The WET (1984) DRY (2002) AVG 2008 Colorado Water Conservation District is considering implementation of a Western Slope “water bank” created REPRESENTATIVE RESERVOIRS through purchase or lease of pre - 1922 water rights for municipality use in the event the full allotment of 1922 160,000 in terstate compact water with California, Arizona, and 140,000 Nevada was demanded. This however could create competition with Front Range utilities such as Denver Water 120,000 Usable Storage, acre-feet and the Northern Water Conservancy District who are equally interested in Western Slope water ri ghts. 100,000 80,000 60,000 40,000 20,000 0 Green Mountain Ruedi Williams Fork Avg. 8/31 Contents 8/31/08 Contents 7