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COLORADO BASIN <br /> Basinwide Conditions Assessment: <br /> The SWSI value of+0.4 indicates that the basin water SURFACE WATER SUPPLY INDEX <br /> supply is normal. Precipitation for the month was 110% of 5 ` ""a"'" <br /> normal, and is 105% of average for the water year. Flow at 4_ <br /> the key index gaging station, Colorado River near Dotsero, ; l 1 <br /> - <br /> averaged 2197 cfs as compared to the historic monthly 3 <br /> average of 3100 cfs. Basinwide reservoir storage was 97% of 2- : - . »- L. <br /> average on August 1, 1991. Dillon Reservoir, Green Mountain 1 1 <br /> Reservoir,Williams Fork Reservoir,Vega Reservoir, and Ruedi 1 0 in )« it ' _r aL <br /> Reservoir have near normal storage levels. Rifle Gap Reservoir - 1- - ✓ ,'; <br /> and Granby Reservoir have storage contents well below J; - 7'( <br /> normal. Granby Reservoir contents measured 352,600 acre- ti <br /> feet on August 1. Basinwide conditions are better than the 3- <br /> past three years. -4 - <br /> JAN82 JAN83 JAN94 JANBS JAN86 JAN87 JAN88 JAN89 JAN90 JAN91 <br /> YCNTN/YEAR <br /> Outlook: <br /> Water supplies are adequate to meet demands for the <br /> remainder of the water year. <br /> Administrative/Management Concerns: COLORADO RIVER NR. DOTSERO <br /> The Dotsero call (January 7, 1902) to satisfy the 3.2 - - <br /> FLOW BY WATER YEAR <br /> Shoshone Hydroelectric Power Plant diversion right of 1250 3 <br /> cfs is likely to go into effect in August. Tributary flow has 2.6 <br /> been steady and has allowed a number of junior rights to stay ., 2.4 - <br /> 2. <br /> in effect. Flow at the Colorado-Utah stateline was 3600 cfs on i^ 2 <br /> August 1 exceeding compact delivery requirements. ;a ,.. <br /> ate- <br /> 1.6 - <br /> LL <br /> I 1.4 <br /> Public Use Impacts: ;y 1.2 - <br /> 1 <br /> Rifle Gap Reservoir, a high-use recreation facility, is 9 <br /> expected to recover from its extremely low levels. O.6 <br /> ���r <br /> Recreational uses on the Colorado River and Roaring Fork 0.2 <br /> River has improved over last year with higher flows. The U.S. ° - <br /> Oet Nov Dee Jan Feb March Aorll May June July Auo Soot <br /> Fish and Wildlife Service is working on an agreement with the MONTH <br /> 0 'MET(1694) + ORY(1977) 0 AVG A 1991 <br /> Bureau of Reclamation and the Colorado Water Conservation <br /> Board to release 10,000-20,000 acre-feet of water from Ruedi <br /> Reservoir to supplement flows in the Grand Valley reach of . <br /> the Colorado River to improve conditions for endangered fish <br /> during low flow periods. These fish include the Squawfish Colorado River Basin Reservoir Supplies <br /> and the Humpback Chub. 180 <br /> 150 <br /> 10 <br /> 130 <br /> _/. ,, <br /> 120 77\\\ <br /> i 110 <br /> gn 100/\ v x <br /> hi 70 <br /> Mt, e°7;;:\\\ <br /> s°.././-\\ <br /> 3 40 <br /> 30 <br /> 20 <br /> 100 /,. <br /> // _/\ <br /> Ciro.Mountain Ru.tlf WI I l l ama Fork <br /> ILLJ Avo. 7/31 Contents ® 7/31/90 Contents <br /> 7 <br />