Upper Stillwater Dam and Reservoir, features of the Central Utah Project, Bonneville Unit, are are Rock Creek, about 31 miles northwest of Duchesne, Utah.Recreation management at Upper Stillwater Reservoir is under the jurisdiction of the U.S. Forest Service, Ashley National Forest. The Forest Service can be reached at 435-789-1181. Situated northwest of Mountain Home, Utah, in a timber setting with an 8,170-foot elevation and a surface area of 330 acres.
- Managed recreation season is June through September with high use on holidays and weekends. Available fish species include rainbow, brown, and brook trout. Tworoose Pass U.S. Geological Service map covers the area. A campground nature trail exists. Reservations are accepted at certain campsites. Fees charged. Some stream fishing below the reservoir.
Recreation - Recreational activities at Upper Stillwater Reservoir include; boating, camping, fishing, hiking, horseback riding, picnicking, recreational vehicles, wildlife viewing and winter sports.
Climate - The climate of Utah varies with the terrain. Visitors to the mountains will experience cool summer nights and passing storms that can alter a sunny day very quickly. Be prepared with layers when recreating in the mountains.
The deserts and canyons of Utah can be dangerous places. Summer temperatures often reach above 100 degrees F, so be sure to carry water on all adventures. Flash floods in the canyons are also a threat. It is difficult to predict incoming weather when deep within a canyon so check reports before venturing into any narrow canyon areas.
Upper Stillwater Reservoir is situated 10 miles northwest of Mountain Home, Utah. Access is over improved gravel Forest Rd. 134. From Duchesne, go 22 miles to Mountain Home, then west on main highway to reservoir.