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<br />The February 1 forecast of the April-July runoff indicated that the
<br />inflow would be well below normal. To conserve water for the irriga-
<br />tion season, releases from Boysen Reservoir were gradually cut from
<br />1,100 ft3/s on February 7, to 300 ft3/s by March 14.
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<br />At the request of the river commissioner, irrigation releases were
<br />initiated on April 11. Releases were increased, as needed to meet
<br />irrigation demands (from about 300 ft3/s on April 11, to a full
<br />irrigation supply of about 1,100 ft3/s on May 11.)
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<br />With good cooperation between the irrigators, the Bureau of
<br />Reclamation, and the river commissioner, efficient reservoir operations
<br />were possible during the 1977 irrigation season. Releases were
<br />regulated as closely as possible to meet downstream irrigation needs
<br />and, as a result, reservoir drawdown was held to a minimum.
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<br />On September 21, a test was conducted on the hollow jet valves by
<br />operating each valve from 0 to 500 ft3/s and back to 0 ft3/s. The
<br />test period lasted for approximately one-half hour.
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<br />A year-end storage of 473,000 acre-feet was below a 17-year average
<br />of 687,000 acre-feet.
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<br />There were 318,800 acre-feet of water stored in the reservoir at
<br />the beginning of the water year which was above normal.
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<br />Inflows to Buffalo Bill Reservoir were below average during the entire
<br />1977 Water Year. Fall and winter inflows were 80 percent of normal.
<br />Winter precipitation was very light and, as a result, the April 1
<br />forecast indicated that the April-July runoff would be about 413,000 acre-
<br />feet, or 55 percent of normal. Spring weather was very mild and dry.
<br />Inflows to Buffalo Bill continued very low during March, April, and
<br />early May. Good rains occurred during the middle of May, and inflows
<br />climbed rapidly to near normal spring levels for about 2 weeks in
<br />June. Reservoir storage rose steadily during late May and early June
<br />but did not fill the reservoir. Storage reached a peak of 312,000 acre-
<br />feet at elevation 5341.90 on June 25, 18 feet below the top of the
<br />conservation pool. Inflows dropped to record low amounts late in
<br />June and continued very low through the end of the year.
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<br />Inflows during the April-July period were 310,000 acre-feet, or 42 per-
<br />cent of average and the lowest April-July inflow of record. During
<br />the May-September period, releases were held at minimum irrigation
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