River Dam

A few nice Gravity Dam images I found:

Parker Dam


Image by Markusnl
Parker Dam is a concrete arch-gravity dam that crosses the Colorado River 249km downstream of Hoover Dam. Built between 1934 and 1938 by the Bureau of Reclamation, it is 98m high, 72m of which are below the riverbed, making it "the deepest dam in the world". The dam’s primary functions are to create a reservoir, and to generate hydroelectric power. The dam straddles the border between California and Arizona. The reservoir behind the dam is called Lake Havasu and can store 798.000m³.

Construction of the dam was a contentious issue for Arizona. Built as part of the larger Colorado River Compact of 1922, Arizona was not pleased with the plan in general and refused to sign it until 1944. Even then Arizona continued to dispute its water allotments until a 1963 Supreme Court decision settled the issue. The court has had to adjust the agreement several times since, most recently in 2000. As recently as 2008 Arizona Senator John McCain has called for a renegotiation of the plan.

In 1935, when Arizona Governor Benjamin Baker Moeur sent 6 members of the Arizona National Guard to observe the dam’s construction, they reported back that there was construction activity on the Arizona side of the river. Arizona Attorney General Arthur La Prade concluded that the Metropolitan Water District had no right to build on Arizona’s territory, which prompted Governor Moeur to send a larger National Guard force to halt construction. The troops were recalled when Secretary of the Interior Harold L. Ickes halted construction until the issue had been settled.

The Department of the Interior took Arizona to court over the issue hoping to end the state’s interference. To the Department of the Interior’s shock, the Supreme Court sided with Arizona and dismissed the injunction. The court concluded that the dam had never been directly approved by Congress and that California was not entitled to build on Arizona’s land without Arizona’s consent. Arizona eventually agreed to allow the dam in exchange for approval of the Gila River irrigation project.

(source)

Gravity Dam


Image by Superburschi
Huge Gravity Dam

Hoover Dam


Image by http2007
Hoover Dam, once known as Boulder Dam, is a concrete arch-gravity dam in the Black Canyon of the Colorado River, on the border between the U.S. states of Arizona and Nevada. When completed in 1936, it was both the world’s largest hydroelectric power generating station and the world’s largest concrete structure. It was surpassed in both these respects by the Grand Coulee Dam in 1945. It is currently the world’s 38th-largest hydroelectric generating station.
This dam, located 30 mi (48 km) southeast of Las Vegas, Nevada, is named after Herbert Hoover, who played an instrumental role in its construction, first as the Secretary of Commerce, and then later, as the President of the United States. Construction began in 1931 and the dam was dedicated by President Franklin D. Roosevelt on September 30, 1935 but it was not fully completed until 1936, which was still more than two years ahead of schedule. The dam and the power plant are operated by the Bureau of Reclamation of the U.S. Department of the Interior. Listed on the National Register of Historic Places in 1981, Hoover Dam was designated a National Historic Landmark in 1985.
Lake Mead is the reservoir created by the dam, named after Elwood Mead, who oversaw the construction of the dam.

en.wikipedia.org/wiki/Hoover_Dam

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