Upper Stillwater Reservoir is another high-mountain reservoir that has one main campground, Rock Creek. The reservoir serves as a popular trailhead into the High Uintas Wilderness Area, with the boundary only one mile north of the dam, near the high water line for the reservoir. Recreation management is under the jurisdiction of the U.S. Forest Service, Ashley National Forest. The managed recreation season is from June to September with high use on holidays and weekends. Available fish species include rainbow, brown, and brook trout.