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<br />002964
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<br />REPORT ON OPERATIONS FOR 1971
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<br />Green Mountain Reservoir
<br />
<br />At the beginning of Water Year 1971 storage in Green Mountain Reservoir was
<br />142,000 acre-feet which was above normal. Precipitation above the reservoir
<br />was normal or better'until early June and generally much below normal there-
<br />after until September during which it was normal.
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<br />The snowpack above the reservoir was about 120 percent of average by April l.
<br />Temperatures during the snowmelt season were generally below normal until
<br />mid-June and above normal thereafter. Continued hot weather during the latter
<br />part of June produced a sustained period of peak inflow. Snowmelt runoff above
<br />the reservoir was 311,000 acre-feet which was 126 percent of average. Inflow
<br />was generally normal or better throughout the year except during May and early
<br />June.
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<br />
<br />With good runoff throughout the area, the flow of the Colorado River at Dotsero
<br />was above 1,250 c. f. s. from late in March until late in September. Releases
<br />from Green Mountain Reservoir for replacement, power production, river regu-
<br />lation, and reservoir regulation lowered the reservoir to a minimum seasonal
<br />content of 56,000 acre-feet by early May. . Considering release in excess of down-
<br />stream requirements, the theoretical fill of the reservoir was achieved by the
<br />middle of June. About 50,000 acre-feet of water was stored thereafter to fill the
<br />reservoir to near capacity early in July. A small amount of controlled spill was
<br />made early inJulyto preserve a margin of safety on the river system considering
<br />that Dillon Reservoir was full and spilling.
<br />
<br />The cities of Denver and Colorado Springs withheld a total.of 8,500 and 13,000
<br />acre-feet of Blue River water, respectively, during the runoff season. With good
<br />flow on the Colorado River, there was no requirement for replacement release
<br />until late in September. There was no call for supplemental release from Green
<br />Mountain Reservoir for irrigation use in western Colorado. Total water-year
<br />inflow above Green Mountain Reservoir was 418,000 acre-feet which was 120 per-
<br />cent of average. Carryover storage in Green Mountain Reservoir at the end of
<br />the year, 142,000 acre-feet, was above normal.
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