Derby Dam is a

diversion dam A diversion dam is a dam that diverts all or a portion of the flow of a river from its natural course. Diversion dams do not generally impound water in a reservoir; instead, the water is diverted into an artificial water course or canal, which ...

built from 1903 to 1905 on the

Truckee River The Truckee River is a river in the U.S. states of California and Nevada. The river flows northeasterly and is long.U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map accessed October 20, 2012 The ...

, located about east of

Reno Reno ( ) is a city in the northwest section of the U.S. state of Nevada, along the Nevada-California border, about north from Lake Tahoe, known as "The Biggest Little City in the World". Known for its casino and tourism industry, Reno is the c ...

Storey A storey (British English) or story (American English) is any level part of a building with a floor that could be used by people (for living, work, storage, recreation, etc.). Plurals for the word are ''storeys'' (UK) and ''stories'' (US). T ...

and Washoe counties in

Nevada Nevada ( ; ) is a U.S. state, state in the Western United States, Western region of the United States. It is bordered by Oregon to the northwest, Idaho to the northeast, California to the west, Arizona to the southeast, and Utah to the east. N ...

United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...

. It diverts water into the Truckee Canal that would otherwise enter Pyramid Lake. The canal feeds Lake Lahontan reservoir in the

Carson River The Carson River is a northwestern List of Nevada rivers, Nevada river that empties into the Carson Sink, an endorheic basin. The main stem of the river is long although the addition of the East Fork makes the total length , traversing five co ...

watershed Watershed is a hydrological term, which has been adopted in other fields in a more or less figurative sense. It may refer to: Hydrology * Drainage divide, the line that separates neighbouring drainage basins * Drainage basin, called a "watershe ...

, where it is used for

irrigation Irrigation (also referred to as watering) is the practice of applying controlled amounts of water to land to help grow Crop, crops, Landscape plant, landscape plants, and Lawn, lawns. Irrigation has been a key aspect of agriculture for over 5,00 ...

. It was the first project of the newly organized U.S. Reclamation Service (known today as the U.S. Bureau of Reclamation), organized by the Reclamation Act of 1902. As a result of the diversion,

Winnemucca Lake Winnemucca Lake is a dry lake bed in northwest Nevada that features the oldest known petroglyphs in North America. Located astride the border between Washoe and Pershing counties, it was a shallow lake until the 1930s, but was dried when a da ...

lost inflow and dried up, and Pyramid Lake lost more than in elevation, resulting in the near-extinction of the

Lahontan cutthroat trout Lahontan cutthroat trout (''Oncorhynchus clarkii henshawi'') is the largest subspecies of cutthroat trout, and the state fish of Nevada. It is one of three subspecies of cutthroat trout that are listed as federally threatened. Natural history ...

. The dam is operated by the Truckee-Carson Irrigation District. It was named after the Derby

Southern Pacific Railroad The Southern Pacific (or Espee from the railroad initials- SP) was an American Class I railroad network that existed from 1865 to 1996 and operated largely in the Western United States. The system was operated by various companies under the ...

station.

History

The dam was constructed for the

U.S. Bureau of Reclamation The Bureau of Reclamation, and formerly the United States Reclamation Service, is a federal agency under the U.S. Department of the Interior, which oversees water resource management, specifically as it applies to the oversight and opera ...

following an authorization for construction issued on March 14, 1903. Construction commenced on October 2, 1903, and was completed on May 20, 1905. The project was authorized on March 14, 1903, by Secretary of the Interior Ethan A. Hitchcock. The dam is an original feature of the Newlands Reclamation Project, named after Nevada Congressman Francis Newlands, who sponsored the Reclamation Act. Not surprisingly, a dam in Newlands, Nevada launched the project. It was the first of five projects authorized and built under the

Reclamation Act of 1902 The Reclamation Act (also known as the Lowlands Reclamation Act or National Reclamation Act) of 1902 () is a United States federal law that funded irrigation projects for the arid lands of 20 states in the American West. The act at first covere ...

. With passage of the act, the federal government assumed a major role in designing and constructing large-scale irrigation projects throughout the West. The diversion dam is part of the network of water storage, diversion, and conveyance structures that provides water for irrigating about of farmland in an area that receives less than of annual precipitation. The dam is not designed for water storage. It is a low high concrete structure that diverts water from the Truckee River into the Truckee Canal and then two main project canals, the Southside Main Canal ("V" Line) and the Northside Main Canal ("T" Line). It was listed on the

National Register of Historic Places The National Register of Historic Places (NRHP) is the United States federal government's official list of districts, sites, buildings, structures and objects deemed worthy of preservation for their historical significance or "great artistic v ...

in 1978 as the "Derby Diversion Dam."

Environmental impact

Water diverted at Derby Dam to farms in Lahontan Valley constitutes as much as three-fourths of the flow of the Truckee River, the largest diversion of water from the

after it flows from

Lake Tahoe Lake Tahoe (; was, Dáʔaw, meaning "the lake") is a Fresh water, freshwater lake in the Sierra Nevada (U.S.), Sierra Nevada of the United States. Lying at , it straddles the state line between California and Nevada, west of Carson City, Nevad ...

. The reduction in flow to Pyramid Lake and the inability of

(the "salmon-trout" as described by Frémont) to bypass the dam for spawning eliminated them from Lake Lahontan and its tributaries and caused the near extinction of the species. But in 1979 a remnant population of the original Pyramid Lake cutthroat trout was discovered in a small brook on Pilot Peak, on the Nevada/Utah border. This population was used to successfully restock Lake Lahontan.

References

''This article contains content from United States government sources in the public domain.'' {{Nevada State Historic Places/Storey United States Bureau of Reclamation dams Dams completed in 1903 Dams on the National Register of Historic Places in Nevada Buildings and structures in Storey County, Nevada National Register of Historic Places in Storey County, Nevada National Register of Historic Places in Washoe County, Nevada Nevada historical markers 1903 establishments in Nevada

History

Environmental impact

See also

References