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N <br /> COLORADO BASIN <br /> Basinwide Conditions Assessment: <br /> The SWSI value of-0.3 indicates that the basin water SURFACE WATER SUPPLY INDEX <br /> supply is normal. Precipitation for the month was 101% of 5 Colorado "'" <br /> normal, and is 105% of average for the water year. Flow at 4_ s f <br /> Colorado River near Dotsero, � 2- i ; - <br /> averaged 1393 cfs as compared to the historic monthly <br /> the key index gaging station, - .� <br /> I r' • <br /> average of 1775 cfs. Basinwide reservoir storage was 100%of 2 4 L . - <br /> average on September 1, 1991. Dillon Reservoir, Green 1 ,� r <br /> Mountain Reservoir,Williams Fork Reservoir,Vega Reservoir, 1 ° - ^'r' - ` ):till <br /> _ t <br /> and Ruedi Reservoir have near normal storage levels. Rifle - ii. <br /> _ : t , iii, <br /> _. <br /> Gap Reservoir and Granby Reservoir have storage contents _ • <br /> - ; .. r f <br /> well below normal. Basinwide conditions are better than the o _21. r - <br /> past three years. _3 <br /> -4 <br /> JANQ2 JANB3 JANS4 JANOS JANOS JANW JANOS JANOS JANO0 JAN91 <br /> Outlook: <br /> MpITW YEAR <br /> Water supplies in the Colorado and Roaring Fork <br /> Rivers will be more than adequate to meet demands for the <br /> remainder of the year. Base flows in smaller side tributaries <br /> have been enhanced by above average precipitation and <br /> should remain close to average throughout the fall and winter. COLORADO RIVER NR. DOTSERO <br /> FLOW BY WATER YEAR <br /> 3.2 <br /> Administrative/Management Concerns: ' <br /> 2.9 <br /> The Dotsero enlargement call of 158 cfs (May 15, 2.5 <br /> 1929) to satisfy the Shoshone Hydroelectric Power Plant 24. <br /> diversion went into effect on August 9, 1991. The 1250 cfs 42 <br /> right (January 7, n 1902) was not activated. Then on August '. <br /> 5_ 1.B <br /> 31, 1991 the Cameo call of 119 cfs (April 26, 1914) to satisfy a.u 1.4 �• <br /> the Grand Valley Canal was enacted. Releases were made out 1.2 . <br /> of Green Mountain Reservoir to satisfy each call. Usually <br /> when water is released for the Cameo call, there is more than O.B J f� <br /> 0.4 <br /> enough to satisfy Shoshone and the Doterso call is dropped. 0.2 _ <br /> Both calls occurred at a much earlier date last year. D <br /> Oct Noy Dec Jan Feb Mar eh AprII May Jun. July Aug S.pt <br /> OWN <br /> Public Use Impacts: """' DRY" A 1161 <br /> Rifle Gap Reservoir,a high-use recreation facility,has <br /> not recovered and is extremely low again. Conversely, Green <br /> Mountain Reservoir should remain fairly high this year and <br /> recreational uses should benefit from this. Also because of Colorado River Basin Reservoir Supplies <br /> reduced demands from the Eastern Slope, Granby Reservoir 150 <br /> levels have remained fairly consistent and should increase "°" <br /> 130-� \ <br /> next year. The U.S.Fish and Wildlife Service in coordination ,� �� <br /> with the Bureau of Reclamation and the Colorado Water i 11D-✓ <br /> Zs\ <br /> Conservation Board started releasingwater from Ruedi + '°° <br /> Reservoir An August 13, 1991. They will likely release 10,000 i i BD r <br /> to 20,000 AF of water to supplement flows in the Grand Valley11g '° <br /> PP t // <br /> reach of the Colorado River to improve conditions for 50• <br /> endangered fish during low flow periods. i 40 <br /> 20 <br /> - 10-Z./7\s\ <br /> :://"\\\\:\, <br /> Green M.urttaIn Rued1 WIIIlam Fork <br /> ® Ayg. 9/31 Cent.Ats ® 8/31/90 Contents <br /> 7 <br />