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as of June 1, 1984 , ..tro:-"" .. U01780 WATER SUPPLY CUT~OOK FOR COLORADO COLORADO RIVER above CISCO, UTAH: aecord breaking temperatures near mid-"~y pushed stream flow on the Colorado River to almost record proporcions with much of the Colorado mainstem above flood stage for nearly 3 weeks. Peak flows exceeded the high runoff experienced last year and in many areas was the highest since 1917. The water supply outlook is for much above normal flows this summer. A good high elevation snowpack along with nearly full reservoirs should provide ample s~~er rIL'loff for most asricultural and recI'eation enthusiasts. Strearnflow forecasts incre9sed 5 to ~.O% in dOVlmstre5.1TI arp.as over those issued last month but headw,gt,pr forecasts ~ere generally unchanged. !.~y precipitation was generally ne9.r normal, most of which oC';'il'red d1il'ing the first week, and ranged from 87% at Green Mountain Dam and Winter Park to 138% at Taylor Park Reservoir. Seasonal precipitation, October through May, is above average across the entire basin. About a third of the Upper Colorado River drainage, the central portion, was greacer chan 150%. As of June 1 the mountain snowpack was generally confined to areas above 10,000 feet but the remaining snow is gener9.11y much 9.bove norrr.al. Berthoud S\L'lll!'.i"', snow .~ourse in the upper Colorado Basin still had 25.0 inches, 177% as of June 1. The melt rates Dear the er.d of May were ..simi].ar to those eULe..rienced last year, 1 to 1 1/2 ir,ches ~ter e~uivalent per day. /\ D~Y runoff ranged from 180% in the headwater area3 to nearly 3 ,imes/nor~al on the Colorado mainstem at Cisco, Utah. May inflow ,0 Lake Powell was 5.4 million acre- , feet, 234% of the 20-year (1961-1980) aver~ge wi~h a total flo~ since OCw0ber l of ~10.7 million acre-feet, 183%. Reservoir storage as of JUL~e 1 in the four lliajor ~eservoirs ~bove Cisco, Dtah (Lake Granby, Dillon, Green MOIL~t~in and 21ue Mesa) is 1.~5 million acre-feet, 144% of average and 85% of capacity. Storage in Lake Powell is 23.l ffiillion acre-feet, 92% of capacity and nearly 2.0 million lower th~n last year at this time. The ApI.il- July inflo~ forecast to Lake Powell is 14.2 million acre-feet, 190% of the 20-year '(1961-1980) average. ttreamflow is expected to recede throllgh July, however, another snowmelc peak (lower than the one in May) is likely durirlg U,e second half of June wr.en the Ugh elevation snow melts. CREEN ~I'TER BASI;]: Forecasts did not c~ar.ge significanT-ly from those issued on ~BY 1 except for a 10% increase on the Yampa and 20% increase in the Little Snake d~~inage. NOAA-NATIONAL /~THER SERVICE CCLORADO BASIN RIVER FORECAST CENTER, Salt Lake City, Utah Gerald Williams, Hydrologist-in-Charge B 0 tiO . 'i 50 ~~