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?!l;;;;"::7~ LI'-.~1 / 002173 i'.c;"10;)~7f?J;filc, 'p.], ,~. r. . c c~ . as of May I, 1985 O/VSr,RIt~DO WJ]7 " rlDf\! e, ~fT . O;.]f/f) COLORADO RIVER above CISCO. UTAH: The water supply outlook for the Colorado River remains above normal with the highest percentage of runoff anticipated in the Gunnison and Dolores basins. Forecasts on the Dolores and Gunnison basins showed slight increases. Streamflow forecasts remained near the same as those issued last month on the mainstem above Dotsero. April precipitation was above normal basin; amounts ranged from 108 Cedaredge. Seasonal precipitation normal over most of the basin. to well above normal over the entire percent near Lake Granby to 344 percent at amounts, October through April, remain above Relative to normal percentages, May 1 snow surveys showed little change in the average basin snow water content from those courses measured on April 1st. Some basin averages include the Upper Colorado - 104%, Gunnison - 113%, Roaring Fork - 115%, and the Dolores - 116%. The snowpack is 60-75% of the pack that existed last year at this time. Runoff during April remained well above normal with a flow at Cisco, Utah of 1,270,000 acre-feet, 311% of normal. Since October 1, 1984 flow at Cisco has been 3.29 million acre-feet, (186% of normal) and is the highest flow on record dating back to 1923. In comparison the 1984 October thru April flow on the Colorado at Cisco, Utah was 2.42 million acre-feet and in 1983 was 1.93 million acre-feet. The end of the month storage in the .four major reservoirs above Cisco, Utah (Granby, Dillon, Green Mountain and Blue Mesa) is 1.09 million acre-feet, 135% of average and 64% of capacity. Storage in Lake Powell is 22.54 million acre-feet, 90% of capacity and 1.14 million acre-feet more than a year ago at this time. The April-July forecast for Lake Powell inflow is 10.80 million acre-feet, 145% of average. Some flooding in low lying and flood prone Gunnison and Dolores basins as well as confluence .of the Gunnison River. The ultimately determine the extent of the flood areas is possible especially in the the Colorado mainstem below the character of the May weather will problems. GREEN RIVER BASIN: The water supply outlook for the Green River remains good, with the upper Green somewhat below average and the lower Green slightly above. Streamflow forecasts increased slightly on the Yampa and White River watersheds, whereas the rest of the basin showed little change from the forecasts issued last month. April precipitation for the Green River basin above Flaming Gorge was only 50% NOAA,NATIONAL WEATHER SERVICE Colorado Basin River Forecast Center, Salt Lake City, Utah Gerald Williams, Rydrologist-in-Charge