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T <br /> COLORADO BASIN <br /> f <br /> Basinwide Conditions Assessment: <br /> The SWSI value of+2.7 indicates that for May the basin COLORADO RIVER BASIN <br /> water supplies were above normal. The Soil Conservation Service s Surface Water Supply Index Hletory <br /> reports May 31 snowpack at 1 45% of normal. Storage in Green 4 <br /> Mountain, Ruedi, and Williams Fork reservoirs totaled 109% of . <br /> . 3 <br /> normal on May 31. The National Weather Service reports May 4 <br /> precipitation at 174% of normal. Flow at the gaging station, 2 . <br /> Colorado River near Dotsero, averaged 6,485 cfs as compared to § ;;il_-__*.- ',.. „ ; w <br /> the 1961-1991 May average of 4,494 cfs. g D _L" i 1— <br /> ,- : 1.:`,, : , -'(/-it t t,. 1 <br /> Outlook /' <br /> o `2 �r , <br /> May was an anxious month with anticipation of a strong , - <br /> runoff and possible floods. The runoff came on strong throughout 3 <br /> most of the month and most sites peaked on May 28. Some -4 • <br /> JANB4 JANBS JANB6 JANB7 JANBB JANB9 JAN90 JAN91 JAN92 JAN93 <br /> flooding did occur but the damage appears minor. The weather MDNTW YEAR <br /> during the first part of June has been cool and the river levels have <br /> dropped drastically. Many people feel that the peak has not <br /> occurred yet. <br /> Administrative/Management Concerns COLORADO RIVER NR, DOTSERO <br /> There were no river calls in May with none expected until 3 FLOW BY WATER YEAR <br /> 3 <br /> August. While most reservoirs were able to fill and spill, some2.B <br /> larger reservoirs such as Dillon,Green Mountain,Williams Fork, 2.6 - <br /> and Ruedi had been dropped to make room for the large z z <br /> anticipated runoff and have not yet filled. These reservoirs should i 2 <br /> ' (2---- <br /> fill in June. Granby Reservoir, which last filled in 1985, gained 1.B <br /> 13 feet in May but is not expected to fill this year. Hughs W i 1.4 ,__.--' <br /> Reservoir on Three Mile Creek near Glenwood Springs caused s 1.2 <br /> concern when the concrete spillway on the downstream side of the 1 fir. <br /> dam washed out and threatened to erode the back into the dam. °9 - <br /> 0.4 <br /> It was monitored around the clock and held stable through the high 0.2 <br /> runoff period. Dam owners are still being advised to be sure D I <br /> OCL Nov D. Jan Feb March April May June July Aug Sept <br /> spillways are clear of snow and other debris. MDNTH <br /> ❑ WET C19194) O DRY[1977) A AVG X 1993 <br /> Public Use impacts <br /> Since the runoff thus far has been less than expected, <br /> diversion structures have held fairly well. Some landowner <br /> damage has occurred, such as on Plateau Creek, but the damage REPRESENTATIVE RESERVOIRS <br /> has not been extensive. It should be a banner year for the 90 COLORADO RIVER BASIN <br /> recreational use of the rivers for rafting,kayaking, etc. and of the BD- <br /> reservoirs for boating and fishing. ,D <br /> ; 60—/ / <br /> �� so � V <br /> ag 4D A, <br /> N v <br /> I' 30...////\\ /-\\ <br /> 20 <br /> /\\\\, <br /> 10 <br /> Oreen Mountain Ruvdl WIIl tams Fork <br /> V 7/ Avg 5/31 Gont.nt• ® 5/31/93 Contents <br /> 7 <br />