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<br />002960
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<br />
<br />Seminoe and Kortes Reservoirs
<br />
<br />Storage in Seminoe Reservoir at the beginning of Water Year 1971 was 840,000
<br />acre-feet, over 300,000 acre-feet above the 10-year average. Winter precipita-
<br />. tion was well above normal and inflow to Seminoe Reservoir was 190 percent of
<br />average during the October-January period. Storage in Seminoe Reservoir was
<br />about 75,000 acre-feet above plan at the end of January due to above normal in-
<br />flow and releases limited to some extent by maintenance.
<br />
<br />As of February 1, the snowpack above Seminoe Reservoir was excellent and fore-
<br />casts indicated that the snowmelt runoff would be better than 170 percent of average.
<br />Transfer of water to Pathfinder Reservoir was continued at capacity of the power-
<br />plant. Seminoe Reservoir was lowered to a seasonal minimum content of 331,000
<br />acre-feet late in March.
<br />
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<br />
<br />As of April 1, fo.recasts indicated the April-July volume of snowmelt runoff would
<br />be 1,200,000 acre-feet, better than 185 percent of average. Transfer of water to
<br />Pathfinder Reservoir was continued at near capacity of the powerplant. fnflow to
<br />Seminoe Reservoir picked up sharply during the latter part of March and remained.
<br />much above normal thereafter. Inflow to Seminoe Reservoir peaked at 11,100
<br />c. f. s. average for 7 days late inJune. Seminoe Reservoir filled to 980,000 acre-
<br />feet, 97 percent of capacity, by the middle of July. Total snowmelt runoff, 1,185,000
<br />acre-feet, was 184 percent of average.
<br />
<br />The total water year inflow was 1,558,000 acre-feet which was 181 percent of
<br />average. Carryover storage in Seminoe Reservoir at the end of the year was
<br />884,000 acre-feet which was much above normal.
<br />
<br />Pathfinder and Alcova Reservoirs
<br />
<br />Carryover storage in Pathfinder Reservoir was 516,000 acre-feet which at the
<br />beginning of Water Year 1971, was nearly 400,000 acre-feet above normal. Stor-
<br />age in Alcova Reservoir was normal.
<br />
<br />Alcova Reservoir was lowered to the normal winter operating level during October
<br />and maintained at that level until March. Pathfinder Reservoir was filled in close
<br />conformance with the most probable plan of operation from October through January.
<br />Thereafter, the reservoir was operated to accommodate reasonable maximum in-
<br />flow conditions. Approximately 100,000 acre-feet of space was reserved in
<br />Pathfinder Reservoir during the runoff period as a margin of safety in the upper
<br />reservoir system.
<br />
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<br />
<br />Refill of Alcova Reservoir was started in March in order to increase the reservoir
<br />water level in preparation for a test nm early in April. The test run was made to
<br />
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