Owyhee Dam

Owyhee Dam

View from the north
Location Malheur County, Oregon
Coordinates 43°38′31″N 117°14′33″W / 43.64194°N 117.24250°WCoordinates: 43°38′31″N 117°14′33″W / 43.64194°N 117.24250°W
Construction began 1928
Opening date 1932
Construction cost $6 million
Operator(s) Owyhee Irrigation District (Operator)
Dam and spillways
Impounds Owyhee River
Height 417 feet (127 m)
Length 833 feet (254 m)
Width (crest) 30 feet (9.1 m)
Width (base) 265 feet (81 m)
Reservoir
Creates Owyhee Reservoir
Total capacity 1,183,300 acre feet (1.4596×109 m3)

Owyhee Dam (National ID # OR00582) is a concrete arch-gravity dam on the Owyhee River in Eastern Oregon near Adrian, Oregon, United States. Completed in 1932 during the Great Depression, the dam generates electricity and provides irrigation water for several irrigation districts in Oregon and neighboring Idaho. At the time of completion, it was the tallest dam of its type in the world (it was surpassed about two years later). The dam is part of the Owyhee Dam Historic District, which is listed on the National Register of Historic Places.

The dam impounds the river to create the Owyhee Reservoir, with storage capacity of nearly 1,200,000 acre feet (1.5 km3) of water. The more than 400-foot (120 m) tall concrete-arch gravity dam is owned by the United States Bureau of Reclamation (USBR) and operated by the Owyhee Irrigation District. Haystack Rock Road is carried over the 833-foot (254 m) long crest of the dam.

History

In August 1927, the US Congress authorized the building of a dam in the canyon of the Owyhee River.[1] Construction of the dam began in 1928 to provide water for irrigation projects.[2] It was built on a foundation of massive rhyolite, massive pitchstone, and associated unmassive pitchstone agglomerate geologic formations adjacent to the Owyhee Mountains.[2] A project of the Bureau of Reclamation, they hired General Construction Company from Seattle to build the dam.[3]

Former Oregonian and then United States President Herbert Hoover dedicated what was the highest dam of its type in the world on July 17, 1932.[4] Secretary of the Interior Ray Lyman Wilbur delivered Hoover’s message at the dam.[5] Owyhee's construction served as a prototype for the larger Hoover Dam on the Colorado River,[5] including the use of refrigeration to cool the concrete.[6]

The dam cost $6,000,000, with the total reclamation project costing $18,000,000.[7] Owyhee was designed by Frank A. Banks, who also designed other dams such as the Grand Coulee Dam on the Columbia River.[8] In the 1980s, electricity-generating capabilities were added to the dam.[9] From 1990 to 1993, the dam was remodeled.[2] Since the height of the dam made a fish ladder impractical, the dam closed off the Owyhee Chinook salmon runs that used to swim as far upstream as Nevada.[10] On September 23, 2010, the dam was added to the National Register of Historic Places as part of the Owyhee Dam Historic District.[11]

Operations

Owyhee Dam bridge
Carries Haystack Rock Road

Water stored at the reservoir is used to irrigate approximately 120,000 acres (490 km2) for use in farming.[5] Four different irrigation district utilize the water from Owyhee Reservoir. There are three hydro-power generating facilities at the reservoir added between 1985 and 1993,[5] with seven megawatt and five megawatt turbines at the dam and power sold to the Idaho Power Company.[9] Owyhee has a unique spillway located part way up the dam that utilizes a 60-foot (18 m) in diameter tunnel to send excess water to the river below during Spring run-off.[12] The United States Bureau of Reclamation owns the facility, and the Owyhee Irrigation District operates the dam.[2]

Dimensions

Spillway
Top of the dam
Up close details of the crest

Owyhee is 833 feet (254 m) long at the crest, which is 30 feet (9.1 m) wide.[2] The base of the dam is 265 feet (81 m) wide, with a height of 417 feet (127 m). The crest elevation sits at 2,675 feet (815 m) above sea level and has a hydraulic height of 325 feet (99 m). Total concrete used in this arch gravity style dam was 537,500 cubic yards (410,900 m3).[2]

The dam’s spillway can allow 41,790 cubic feet (1,183 m3) per second of water flow, while its tunnel capacity is 1,100 cubic feet (31 m3) per second.[2] The outlet works can allow up to 2,530 cubic feet (72 m3) per second. If full, the reservoir would hold 1,183,300 acre feet (1.4596×109 m3) of water,[2] and is 53 miles (85 km) long.[13] The total drainage area of the dam and reservoir is 10,900 square miles (28,000 km2) in Eastern Oregon and western Idaho.

Owyhee Dam was the tallest dam in the world until the Lac du Chambon dam was built in France in 1934 at 136.7 meters (448 feet).[14]

See also

References

  1. ↑ "HIGHEST DAM IN THE WORLD: Government Going Ahead With Ambitious Oregon Project", The New York Times, August 7, 1927.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 "Owyhee Dam", United States Bureau of Reclamation. Retrieved on February 4, 2008.
  3. ↑ Terry, John. "Oregon’s Trails: Owyhee once set a record for dams", The Oregonian, June 24, 2007.
  4. ↑ 232 Hoover: "Message on the Dedication of Owyhee Dam", The American Presidency Project, University of Santa Barbara, Retrieved on February 4, 2008
  5. ↑ 5.0 5.1 5.2 5.3 "Looking Back, Looking Forward' — Owyhee Dam Celebrates its 75th Anniversary", People, Land & Water. Retrieved on February 4, 2008.
  6. ↑ By The Associated Press. "Boulder Dam Will Contain Huge Refrigerating System", The New York Times, June 19, 1933
  7. ↑ "HIGHEST DAM IS DEDICATED: Secretary Wilbur Officiates at Ceremony in Owyhee, Ore.", The New York Times, July 18, 1932.
  8. ↑ Neuberger, Richard L. "Man's Greatest Structure: Water runs over the Grand Coulee spillway. Its builder, who worked in silence, carries the President's citation: 'A fine job well done'," The New York Times, August 9, 1942.
  9. ↑ 9.0 9.1 Terry, John. "Oregon’s Trails: 1920s dam got turbines during 1980s", The Oregonian, August 26, 2007.
  10. ↑ Meehan, Brian T. "Lessons of the Past", The Oregonian, October 29, 1995.
  11. ↑ "Weekly List of Actions Taken on Properties: 9/20/10 through 9/24/10". National Register of Historic Places Listings. National Park Service. October 1, 2010. Retrieved June 19, 2011.
  12. ↑ "The Glory Hole, Owyhee Dam’s unique spillway", The Oregonian, June 17, 1993.
  13. ↑ Lake Owyhee State Park. Oregon Parks and Recreation Department. Retrieved on February 4, 2008.
  14. ↑ Nicolas Janberg ICS, "Chambon Dam" Structurae, Retrieved December 18, 2009

External links

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