Upper Stillwater Reservoir, body of water
Upper Stillwater Reservoir is a large body of water in the Uinta Mountains of Duchesne County, Utah, created by a concrete dam on the High Uintas' south slope. The water stretches across a wide area surrounded by rocky slopes, pine trees, and aspen groves, with two nearby campgrounds providing base facilities for visitors.
The Upper Stillwater Dam was completed in 1987, creating the reservoir as a major water management project in Utah's mountains. Built with a stepped spillway design, it was developed to store water for agricultural irrigation across the region and nearby communities on the Wasatch Front.
Visit between June and September when weather conditions are most favorable for camping, fishing, and hiking in the mountains. The boat ramp is currently modified and vehicles cannot back down directly, so watercraft must be carried to the water, and boating is restricted when water levels are high.
When the reservoir fills to capacity, water cascades over the dam creating a waterfall drop of more than 200 feet, a sight taller than Niagara Falls that draws many visitors during high water years. This dramatic overflow happens when snowmelt occurs rapidly in early summer.
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