Thomson Reservoir (Oregon)

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Thomson Reservoir
Coordinates 42°57′52″N121°05′16″W / 42.96444°N 121.08778°W / 42.96444; -121.08778 Coordinates: 42°57′52″N121°05′16″W / 42.96444°N 121.08778°W / 42.96444; -121.08778 [1]
Primary inflows intermittent streams
Primary outflows Silver Creek
Basin  countries United States
Surface area 2,159.2 acres (10 km2) [2]
Water volume 7,750 acre⋅ft (9,560,000 m3) [2]
Shore length1 26.7 mi (40 km) [2]
Surface elevation 4,953 ft (1,510 m) [1]
1 Shore length is not a well-defined measure.

Thomson Reservoir [1] , also known as Thomson Valley Reservoir [2] , is an irrigation reservoir on the upper East Fork of Silver Creek in the Fremont National Forest, approximately ten miles upstream from Silver Lake, Oregon, in the United States. Constructed in 1930 alongside a dam by the Silver Lake Irrigation District, Thomson Reservoir spans roughly 1800 acres and can hold 7750 acre-feet of water.

Reservoir A storage space for fluids

A reservoir is, most commonly, an enlarged natural or artificial lake, pond or impoundment created using a dam or lock to store water.

Silver Creek is the name of several different streams, locales, and other features in the U.S. state of Oregon, including:

The Fremont-Winema National Forest of south central Oregon is a mountainous region with a rich geological, ecological, archaeological, and historical history. Founded in 1908, the Fremont National Forest was originally protected as the Goose Lake Forest Reserve in 1906. The name was soon changed to Fremont National Forest, named after John C. Frémont, who explored the area for the United States Army Corps of Engineers in 1843. It absorbed part of Paulina National Forest on July 19, 1915. In 2002, it was administratively combined with the Winema National Forest as the Fremont–Winema National Forests.



Thompson Reservoir is classified as mesotrophic. There are low densities of A. formosa in the spring and low densities of C. hirundinella and M. granulata in summer. Due to the extreme water fluctuations from reservoir operations, macrophytes are scarce. [3]

<i>Asterionella</i> genus of diatoms

Asterionella is a genus of pennate freshwater diatoms. They are frequently found in star-shaped colonies of individuals.

<i>Ceratium</i> genus of dinoflagellates

The genus Ceratium includes species of freshwater and marine dinoflagellates. Most species of Ceratium are unicellular organisms that are characterized by their armored plates, two flagella, and horns. Species of Ceratium are found worldwide and are of concern due to their blooms.


Thomson Reservoir is accessible by road. It contains two United States Forest Service campgrounds. The reservoir itself is located within the National Forest, but half of the shoreline is held by private owners. The dominant fish species is the tui chub and its high population has resulted in a decline of rainbow trout. As a result, each spring the reservoir is stocked with about 200,000 fingerling trout. Due to the overpopulation of "rough fish", the camping facilities are not heavily used. [2]

United States Forest Service federal forest and grassland administrators

The United States Forest Service (USFS) is an agency of the U.S. Department of Agriculture that administers the nation's 154 national forests and 20 national grasslands, which encompass 193 million acres (780,000 km2). Major divisions of the agency include the National Forest System, State and Private Forestry, Business Operations, and the Research and Development branch. Managing approximately 25% of federal lands, it is the only major national land agency that is outside the U.S. Department of the Interior.

The Tui chub is a cyprinid fish native to western North America. Widespread in many areas, it is an important food source for other fish, including the cutthroat trout.

Rainbow trout species of trout

The rainbow trout is a trout and species of salmonid native to cold-water tributaries of the Pacific Ocean in Asia and North America. The steelhead is an anadromous (sea-run) form of the coastal rainbow trout(O. m. irideus) or Columbia River redband trout (O. m. gairdneri) that usually returns to fresh water to spawn after living two to three years in the ocean. Freshwater forms that have been introduced into the Great Lakes and migrate into tributaries to spawn are also called steelhead.

See also


  1. 1 2 3 (U.S.), Geological Survey; Names, United States Board on Geographic (1990). The National gazetteer of the United States of America: United States concise 1990. Geological Survey professional paper. U.S. G.P.O. p. 21-PA967. Retrieved 2017-07-30.
  2. 1 2 3 4 5 "Thompson Reservoir". Atlas of Oregon Lakes. Retrieved 2017-07-30.
  3. McHugh, Tom (1972). The time of the buffalo. Lincoln: University of Nebraska Press. ISBN   978-0-8032-8105-9.

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