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<br />During April, the snowpack inereltled JliglHly t6 160 percent of average and the April-July <br />forecast was 488,000 acre-feet which was +5f percent of average. Precipitation was nefti' <br />fl6l'ftutl at +W percent of average but April inflows were high fit 162 percent of average. April <br />turbine releases were at the maximum release of +,300 W Is for the low reservoir level. Dillon <br />Reservoir spilled an average of6+5 ftJ/s during April. <br /> <br />For the November through April period, the release for natural flow shortages was called for <br />on the Colorado River at the Shoshone Powerplant for +;-4lffi Wls from Deeember II through <br />Jmltlfl!) 2. FraM JMil:1flry J tftrel\igh.f~ 18, thG Sho3b6l1C ea:U .,.83 effBac t51'6y\crpbmt <br />mainternmee. For the remainder of the winter, spring, and summer, the release for natural flow <br />shortages was 1161 e8:He.a fur an the Colena6o Ri. er at 1he. She3nooc P 6 nerpl8:ftt MU: t5 the hi~ <br />nam:ral He .yVS. <br /> <br />Reservoir storage reached the year's low of 49,398 acre-feet on Mil) 5. A target storage of <br />60,000 acre-feet at the end of April is desired for the most probable runoff condition and <br />50,000 acre-feet for the maximum runoff condition, which was the runoff condition forecasted <br />for Green Mountain. <br /> <br />May precipitation was fiellf 116rmll! fit 98 percent of average for the Blue River watershed. The <br />May computed inflow of 135,388 acre-feet was the higheJt Mil) iMla.. Jinee teeaMs llegll!i <br />in 1943. The June I snow-water content for the Fremont Pass, Hoosier, and Grizzly stations <br />was H:5 inches and average is &:G inches. DlIe t6 the elfpeeted high 1"lIfi6ff etlnditimtl, DiIlt'lll <br />R-eseFVsir e8atinal!S t8 Sllill in May ana w:eragesli 15 WI-r. Dillon Reservoir filled to capacity <br />on.Jtme 21, 254,000 acre-feet. Spill at Dillon reached a maximum of f;69G Wls by Jtme 14. <br />The spill continued through the midtlle 6f 1.tigWlt fur a 16tl1:1 6f 289,252 acre-feet spilled in <br />water year 1998. Dillon Reservoir ended the water year at a storage level of243,262 acre-feet <br />which was -HB percent of average (236,800 acre-feet). <br /> <br />Computed inflow to Green Mountain Reservoir peaked for the year at 3,985 W,'jj 6n JlI:fte 22. <br />June precipitation was 84 percent of average and inflow was much above average at +5<1- <br />percent. A e,l'ftJ,] K.lett3G thMtlgh the tl1be .a:l.e.J .~ Jtw:ted 6ft Jt!nt:. 19 beeflWG efthe mp <br />run6ff e6ndi1iem. A total of 28,298 acre-feet was bypassed in June. The turbine release was <br />+;500 Wls while the bypass release was +;l>>9 Wls for a peak outflow ofi!;5i-9 Wls on:hme <br />2!4. The peak inflow was regulated by the reservoir and reduced by +;466 Wls for flood <br />control purposes. <br /> <br />During July the inflow and turbine releases l'el1:'IlIiried mgh dtte 16 tIIe:!l'ill 6fDill611 Re='\eil' <br />MId high Jll6..1nGlt I'UI16ff e6nditt6ns. Turbine releases were at the elt!'ac:i~ 6f 1589 Wls <br />during early July. The July bypass flow was 5;338 acre-feet llftti ..lI3 3htrtd6.Jt\ tln.Jttly 8. The <br />July undepleted inflow of 81,588 acre-feet was ~ percent of average. Actual April-July <br />runoffwas 426,499 acre-feet, +5f percent of average, but only 3;600 acre-feet less than the <br />April I forecast of 08,888 acre-feet. The water year 1998 April-July undepleted inflow was <br />tbe J~G3nd h::iglle.:tt of reGora Jincc: m3toliea:l fe.~aNb hegan in. 1928. Maximum reservoir <br />storage was 152, t 12 acre-feet from 1<ttg113t 3 5. <br /> <br />filename: CBT A0P98.DFT <br /> <br />9 <br /> <br />PrelimiJUlry Working Draft July 8.1999 <br />