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<br />Boysen Reservoir
<br />
<br />Storag-e in Boysen Reservoir was normal, 663,000 acre-feet, at the beginning of
<br />Water Year 1971. Winter inflow to Boysen Reservoir during the October-January
<br />period was 65 percent of average. '
<br />
<br />As o[ February 1, storage in Boyse.n Reservoir was according to plan, and fore-
<br />casts indicated that snowmelt runoff would be about 120 percent of average.
<br />Releases from Boysen Reservoir were increased tonear capacity of the powcrplant
<br />in February to continue drawdown of the reservoir.
<br />
<br />Forecasts on April 1 indicated that the snowmelt runoff would be about 150 percent
<br />of average. With exceptionally good precipitation during April and May, actual
<br />.snowmelt runoff into Bovsen Reservoir amounted to 1,108,000 acre-feet which
<br />was nearly 175 percent of average.
<br />
<br />Releases from Boysen Reservoir were increased to capacity of the powerplant in
<br />April. Bypass and spill of water in addition to the power release were required
<br />from the latter part of June until early in August.
<br />
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<br />
<br />Boysen Reservoir filled to a maximum. seasonal content of 844,000 acre-feet late
<br />in June. Total \yater year inl10w was 1, 499, 000 acre-feet, nearly 150 percent of
<br />average. Carryover storage at the end.of theyear was well above normal, 741,000
<br />acre-feet.
<br />
<br />The Omaha District of the Corps of Engineers estimated that Boysen Reservoir
<br />prevented flood damages of $582,700, including $120,000 in damages prevented
<br />on the Yellowstone River, $408,500 in damages prevented on the Missouri River,
<br />and $54,200 in damages on the Big Horn River.
<br />
<br />Buffalo Bill Reservoir
<br />
<br />At the beginning of WaterY ear 1971 storage in Buffalo Bill Reservoir was normal,
<br />291,000 acre-feet. Winter inflow during the October-March period was normal at
<br />105 percent of average. Winter power releases were scheduled to achieve normal
<br />reservoir drawdown.
<br />
<br />As of April 1 , storage in Buffalo Bill Reservoir was according to plan and snow-
<br />melt runoff was expected to be about 125 percent of average. Delivery of irrigation
<br />water starting in the middle of April lowered Buffalo Bill Reservoir to a minimum
<br />seasonal content of 152, 000 acre-feet late in May. Inflow to Buffalo Bill Reservoir
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