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<br />
<br />The 1977 drought caused storage levels in Carter and Lake Granby
<br />to drop sharply and the lakes were depleted by the end of the water
<br />year. Seasonal water deliveries for the Colorado-Big Thompson Project
<br />totaled 288,500 acre-feet and were 145 percent of a l7-year average.
<br />
<br />With a total yearend storage of 257,400 acre-feet in Lake Granby,
<br />Horsetooth Reservoir, and Carter Lake, above-normal precipitation
<br />will be required this winter in order to provide an adequate water
<br />supply in 1973.
<br />
<br />Serninoe and Kartes Reservoirs
<br />
<br />There were 865,300 acre-feet of water stored in Seminoe Reservoir at the
<br />beginning of the water year which was 130 percent of the 17-year
<br />average.
<br />
<br />As a result of below-normal winter inflow and precipitation, Seminoe
<br />Reservoir was slightly below plan on February 1. The February 1
<br />forecast of the April-July runoff was 44 percent (330,000 acre-feet)
<br />of a 17-year average. The forecast was reduced to 36 percent on
<br />March 1 and then increased to 38 percent on April 1. All the forecasts
<br />proved to be fairly accurate as the actual April-July inflow to Seminoe
<br />Reservoir totaled 313,600 acre-feet which was 41 percent of average.
<br />This was the third lowest inflow of record since 1905. The record low
<br />April-July inflow of 166,900 acre-feet occurred in 1934.
<br />
<br />Prior to the February 1 forecast, Seminoe and Kortes Powerplant units
<br />were used as controlling plants for the Western Division Power System.
<br />During the perigd October 1 - February 1, power releases varied from
<br />900 to 2,600 ft Is. However, after a low February 1 forecast, the
<br />Kartes ~eservoir release was reduced to the minimum fishery requirement
<br />(500 ft Is) and maintained at that level for the remainder of the
<br />water year.
<br />
<br />With a low April 1 forecast and continued minimum release for fishery
<br />requirements, Seminoe Reservoir was lowered to the minimum storage
<br />content of 486,700 acre-feet on March 22. A maximum storage content
<br />of 672,600 acre-feet (66 percent of capacity) was attained on June 22,
<br />1977 .
<br />
<br />There were 604,200 acre-feet of water stored in Seminoe Reservoir on
<br />September 30, which was below the 17-year average of 664,500 acre-feet.
<br />
<br />14
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