page_title: Upper Stillwater Reservoir
section_title: Annual Spill
hierarchical_section_title: Upper Stillwater Reservoir / Annual Spill
caption_attribution_description: English: Close up view of the spill.
context_page_description: 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.
  The reservoir was created in 1987 by the construction of a concrete gravity 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. It is estimated that twice or more the capacity of the reservoir is diverted towards the Wasatch Front annually. The primary use of the water is for irrigation.
context_section_description: The Stillwater Dam is designed with a steep stepped spillway. During years of high snow or fast melt conditions, the dam may fill until the water elevation reaches the spillway. The spill creates a curtain of falling water 600 feet wide and 200 feet tall. The event typically lasts for a few days and commonly attracts tourist and media attention.
caption: Close up view of the spill.
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