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<br />Pathfinder Reservoir
<br />
<br />Pathfinder storage of 529,700 acre-feet at the start of the water
<br />year was above a 17-year average of 349,800 acre-feet.
<br />
<br />During the winter, water was transferred from Seminoe to Pathfinder
<br />Reservoir for power generation and to achieve certain reservoir
<br />storage positions. Pathfinder Reservoir reached a maximum storage
<br />content of 765,300 acre-feet on February 1, 1977. Thereafter, the
<br />reservoir was drawn down to meet downstream irrigation demands.
<br />
<br />As the drought and downstream irrigation needs continued throughout
<br />the summer, releases through the Fremont Canyon Powerplant appeared
<br />to be insufficient, and the river outlet valves were opened on
<br />July 25. The valves were operated for a total of 21 days, during
<br />which time 64,700 acre-feet of water were released. During this
<br />period, the release, including Fremont Canyon Powerplant, averaged
<br />3,800 ft 3/ s.
<br />
<br />There were 249,500 acre-feet of water in the reservoir at the end
<br />of the water year, which was below the 17-year average of 349,800
<br />acre-feet.
<br />
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<br />
<br />At the end of the water year, 853,700
<br />in Seminoe and Pathfinder Reservoirs.
<br />will require an above-normal snowpack
<br />storage levels by next year.
<br />
<br />acre-feet of water were stored
<br />This is below normal, and
<br />this winter to reach normal
<br />
<br />Alcova and Gray Reef Reservoirs
<br />
<br />During October and early November, the water level in Alcova Reservoir
<br />was lowered 10 feet to the normal winter operating level (elevation
<br />5488.) This water level was maintained until April 3, when the
<br />summer refill was started. The normal summer operating level
<br />(elevation 5498) was attained on May 6 and continued at that level
<br />within + 1 foot for the remainder of the water year.
<br />
<br />The Gray Reef release averaged 1,020 ft3/s during October. A release
<br />of 900 ft3/s was started on llovember 2 to prevent icing problems and
<br />continued until the middle of December, when it was reduced to
<br />850 ft3/s. The release was further reduced to 750 ft3/s on February 25.
<br />
<br />With above-normal Alcova-to-Glendo gains in April and early May,
<br />Glendo Reservoir filled to 97 percent of its conservation capacity,
<br />and the Gray Reef release was reduced to 450 ft3/s. The snowmelt
<br />runoff between Alcova and Glendo Reservoirs peaked at 2,290 ft3/s on
<br />May 17; in addition, a rainfall peak of 4,320 ft3/s occurred on July 13.
<br />
<br />15
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