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Gross generation at the powerplant totaled 96,980,BSG kilowatt-hours for water year 1998. This was l'Il.1leh lIne.co average at ~.percent of average, cltie te thco high l'tl1l:eff)co!lf. Willow Creek Reservoir Completed in 1953, Willow Creek Reservoir has a total storage capacity of 10,600 acre-feet. The uncontrolled spillway, located at the left abutment, has a capacity of3,200 ft'/s. The Willow Creek Feeder Canal begins at the left abutment with a capacity of 400 ft'/s for pumping to Granby Reservoir. Reservoir carryover storage coming into water year 1998 was 8;eti acre-feet. This was 333- acre-feet lleIow the 30- year average. During October, the reservoir was drawn down to ~ acre-feet to provide storage space for winter inflows. T'hc man ae .~li nft3 (faftC em: month tarl) 18 begin the meter c:afttrol Ge.n.ter replaeenletlt Ilt tile ptlII.ping pl!l:llt. October-January inflows were ftefII"average at W8 percent of average. Precipitation for the October-January period was well !the.e lI.el'llgt: at H.;t percent of average. The February I snow-water content was ~ percent of average, which resulted in an April- July runoff forecast of 65,899 acre-feet. The March I snow-water content increased to +44 percent of average and the April-July nmoff forecast increased to 70,B99 acre-feet. October through March precipitation in the Willow Creek watershed was !the. e 8.. t:ragt: lit IJJ percent of the 1966-1995 average. Snowpack water content for the April I measurement was B+ percent of average. The April-July snowmelt nmoff forecast remained constant at 70,909 acre-feet. Inflows were -l6G percent of average for March. A bypass release above the minimum release of'f ftJ Is was initiated on M!lfeh 18 cItic; te the Iligh l'W\6ff fllreellStea for Willow Creek and high storage level of Lake Granby. The total bypass release for March was ~ acre-feet. April inflows were -l4'f percent of average for the month. ne pttmpir,g te Lflke C~ eeetlffea dttriftg the mlll\th.. April had ml1eh bdll.. 8.. erage precipitation at ~ percent of average, and the May I snowpack was B5 percent of average. The April-July runoff forecast was aeereil5ea te 69,9S9 acre-feet. Although May precipitation was Ill.. lit 71 percent of average, natural inflow remMnea hi~ lit J4,599 acre-feet, -l6+ percent of average. Inflow peaked at ~ ft'/s on Mil) 17. A total of~ acre-feet was pumped to Lake Granby during May fer tt3liftg I'tIfl'1l3C03 enl). Bypass releases above the minimum required release to Willow Creek were 5;&H acre-feet for April and 29,945 acre-feet for May. All bypass releases were made through the outlet works. fiknmnc:CBTAoP9~DFT 11 PreliminarY WortiDg Draft July.. 1999