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WATER YEAR 1998 OPERATIONS Green Mountain Reservoir Green Mountain Reservoir and Powerplant, completed in 1943, are located on the Blue River on Colorado's western slope. The reservoir with a total capacity of 154,645 acre-feet provides storage water releases for power production, replacement of out of priority depletions, and contract water de6~!iries ~. The powerplant has two units with a total installed capacity of 26 megawatts. The spillway located on the left abutment is controlled by three 25 x 22 foot radial gates and has a total release capability of25,000 ft3/s. Reservoir storage coming into water year 1998 was high at 118,689l;icre-feet compared to an average September 30 storage of 124,800 acre-feet. Colorado River native flows were aba.e a.erag!: during October averaging ~ Wls at the Dotsero gage. TI1'i3:f1e n naJ adeqt11\k. t6 rnect de .,,~ ~~8.ter ll3er dc:nlan6J and re3wted in 1'16 need fur naftJ:ral flo n 3ftertsge reka3e3 ReM Green. ~f6ttntttin Re3e.r. Oil to Rlee! 1:hc neel.h !It the Cllfile6 gage dtliillg Oetaba. Turbine releases averaged m Wls during October. The turbines were set at 409 ta 459 Wls during November. Winter turbine releases (December through January) averaged ~ Wls to meet replacement requirements, bypass of inflow, power production, and the desired end-of-January storage position. The end of January storage for Dillon Reservoir was 24J,075 acre-feet ..meh n!l:l 27,599 aere feet higher than last year and W9 percent of average (223,400 acre-feet). The October-January precipitation was IfJ:l1eh lIba Ie a. el'll~ at m percent of the 1966-1995 average, and the February I snowpack data was recorded at +t+ percent of average. The February I forecast of the April-July nmoffvolume totaled 409,999 acre-feet which was ~ percent of average. Reservoir storage e6ntmliea eleJe te l'ilm during February, and releases averaged ~ Wis. Precipitation for February was well above average at B3 percent of the 1966-1995 average. ThiJ illelell:lea the Mllfeill fareell3t af the April JuI) l'lIIlti!f yaltlIfl(; 10 415,889 tiere feet. Snowfall aeel'ellSed 3ligiltl) in March to HS percent of average and precipitation was a6- percent of average. March inflow was H3- percent of average. Turbine releases were merell:lea t8 1,999 Wls during late March dt1e t6 tftc: higli forecasted runoff and to maximize hydropower generation and minimize spills. Dillon Reservoir started to spill in M!lfM filIe ta the I.:Jqleetea mgil runoff conditions and by ~bl'eh J I nll:l at 699 Wis. filename: CBT AOP98.DFf 8 Proliminary Working Draft July &; 1999