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<br />North Platte Project - 96 percent
<br />Glendo Unit- - - - - 480 percent
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<br />A yearend storage of 11,400 acre-feet in Guernsey Reservoir was near
<br />the 17-year average of 11,300 acre-feet.
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<br />Boysen Reservoir
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<br />There were 738,000 acre-feet of water in storage at the beginning
<br />of the water year which was above normal. A maximum storage of
<br />746,500 acre-feet occurred on October 12, 1976.
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<br />Inflows to Boysen Reservoir were somewhat below average during the
<br />fall and winter months. Winter snow accumulation in the surrounding
<br />drainage area was very light and; consequently, the April 1 forecast
<br />indicated spring runoff would be well below normal. Spring weather
<br />continued dry and, with inflows well below normal, it was necessary
<br />to reduce March releases to prevent further decline in reservoir
<br />storage levels. Storage increased slowly during April and May to
<br />a seasonal peak of 604,650 acre-feet at elevation 4713.89 on May 13.
<br />The peak storage was 11 feet below the top of the joint-use pool.
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<br />Since the natural flow of the Wind River was very low, storage water
<br />from Boysen Reservoir became an essential part of the irrigation
<br />supply for most irrigators in the area. During the 1977 irrigation
<br />season, 125,900 acre-feet were released from Boysen Reservoir. This
<br />storage release helped supply a major part of the irrigation requirement
<br />for a number of irrigation districts and companies on the Wind and
<br />Bighorn Rivers.
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<br />Reservoir releases were reduced from about 1,600 to 1,000 ft /s on
<br />November 10 during a power maintenance outage, which occurred between
<br />November 10 and December 1.
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<br />Ice problems on the Bighorn River were reported near Worland on
<br />January 12. However, the problems were minor and did not warrant
<br />any change in reservoir operations. Warm temperatures alleviated the
<br />ice problems on January 19.
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<br />On January 31, some problems were encountered with one of the power-
<br />plant units. Spilling was started at this time to facilitate taking
<br />the unit off line for repairs without the necessity of a sudden change
<br />in the release rates to the river. Boysen releases were gradually
<br />reduced from 1,600 ft3/s January 31, to the capacity of one powerplant
<br />unit (1,100 ft3/s) on February 4, 1977.
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