| Upper Stillwater Reservoir | |
|---|---|
 Looking North East towards Upper Still Water dam | |
  Upper Stillwater Reservoir  Upper Stillwater Reservoir | |
| Location | Duchesne County, Utah, United States |
| Coordinates | 40°33′35″N110°41′53″W / 40.55972°N 110.69806°W |
| Type | reservoir |
| Primary outflows | Rock Creek |
| Basin countries | United States |
| Max. length | 2,134 m (7,001 ft) |
| Max. width | 610 m (2,000 ft) |
| Average depth | 31.6 m (104 ft) |
| Max. depth | 51 m (167 ft) |
| Water volume | 40.857 million cubic metres (33,123 acre⋅ft) |
| Shore length1 | 5,486 m (17,999 ft) |
| Surface elevation | 2,492 m (8,176 ft) |
| 1 Shore length is not a well-defined measure. | |
Upper Stillwater Reservoir is a large high mountain reservoir on the south slope of the High Uintas in Duchesne County, Utah. The reservoir is part of the Central Utah Project.
Contents
The reservoir was created in 1987 by the construction of a concrete gravity dam (Upper Stillwater Dam). The architecture of the rolled concrete dam is an attraction for engineers.
The reservoir elevation is 8,176 ft, and the mean depth is 103.5 ft. Available fish species include rainbow, brown, and brook trout.
The watershed is primarily the Uinta Mountains, the watershed high point being Ostler Peak (12,717 ft). It is estimated that twice or more the reservoir capacity is diverted towards the Wasatch Front annually. The primary use of the water is for irrigation. [1]
