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Boulder Dam, (i.e. Hoover Dam) between Arizona and Nevada. Placing concrete in the sidewall of the Nevada spillway. A 2 cubic yard bottom-dump bucket is being handled by crane. Note the manner in which the panels are staggered

Boulder Dam, (i.e. Hoover Dam) between Arizona and Nevada. Placing concrete in the sidewall of the Nevada spillway. A 2 cubic yard bottom-dump bucket is being handled by crane. Note the manner in which the panels are staggered

Boulder [i.e., Hoover] Dam, Colo. [i.e., Arizona and Nevada]

United States Code: Boulder Canyon Project, 43 U.S.C. §§ 617-618p (1952)

U.S. Reports: F.P.C. v. Southern Cal. Edison Co., 376 U.S. 205 (1964)

Aerial view of Hoover Dam near Boulder City, Nevada

Aerial view of Hoover Dam, Nevada

Aerial view of Hoover Dam, Nevada

Aerial view of Hoover Dam, near Boulder City, Nevada, with the Lake Mead National Recreation Area, which the dam's blocking of the Colorado created, in the distance

Aerial views of Lake Mead National Recreation Area, formed when Hoover Dam backed up the Colorado River. Boulder City, Nevada

Above Hoover Dam near Boulder City, Nevada

Lake Mead National Recreation Area, formed when Boulder Dam (now Hoover Dam) was built, Boulder City, Nevada

Aerial view of Hoover Dam, near Boulder City, Nevada

Aerial view of Hoover Dam, near Boulder City, Nevada

Aerial view of Hoover Dam, Nevada

Aerial view of Hoover Dam, near Boulder City, Nevada

Aerial view of Hoover Dam, near Boulder City, Nevada

Aerial views of Lake Mead National Recreation Area, formed when Hoover Dam backed up the Colorado River. Boulder City, Nevada

Lake Mead National Recreation Area, formed by the creation of Hoover Dam, near Boulder City, Nevada

Aerial view of Hoover Dam, near Boulder City, Nevada

Aerial view of Hoover Dam, near Boulder City, Nevada

Aerial view of Hoover Dam, near Boulder City, Nevada

Aerial view of Hoover Dam, near Boulder City, Nevada

Aerial view of Hoover Dam near Boulder City, Nevada

Aerial view of Hoover Dam, near Boulder City, Nevada

Lake Mead National Recreation Area, formed when Boulder Dam (now Hoover Dam) was built, Boulder City, Nevada

Lake Mead National Recreation Area, formed when Boulder Dam (now Hoover Dam) was built, Boulder City, Nevada

Aerial view of Hoover Dam near Boulder City, Nevada

Aerial view of Hoover Dam, near Boulder City, Nevada

View from Hoover Dam of the 2010 Mike O'Callaghan-Pat Tillman Memorial Bridge past the massive dam

Aerial view of the intricate network of support cables at massive Hoover Dam, which straddles the border between Arizona and Nevada in the Black Canyon of the Colorado River

View from Hoover Dam of the 2010 Mike O'Callaghan-Pat Tillman Memorial Bridge past the massive dam

The 150-ton cableway crane at massive Hoover Dam, which straddles the border between Arizona and Nevada in the Black Canyon of the Colorado River

Plaques explaining the name of the 2010 Mike O'Callaghan-Pat Tillman Memorial Bridge past the massive Hoover Dam

One of four 338-foot-high intake towers that stand in the deep waters of Lake Mead behind massive Hoover Dam, which straddles the border between Arizona and Nevada in the Black Canyon of the Colorado River. This tower shows the current time in Arizona

Aerial view of massive Hoover Dam, which straddles the border between Arizona and Nevada in the Black Canyon of the Colorado River, as well as a portion of the dammed river that became Lake Mead, the locus of a widespread national recreation area

Outside entrance to an elevator leading to the visitor center at Hoover Dam, which straddles the Arizona and Nevada borders on the Colorado River

Aerial view of massive Hoover Dam, which straddles the border between Arizona and Nevada in the Black Canyon of the Colorado River, as well as a portion of the dammed river that became Lake Mead, the locus of a widespread national recreation area

View down at the Colorado from Hoover Dam, which straddles the Arizona and Nevada borders on river

Aerial view of a portion the water and surroundings of Lake Mead, created by the construction of nearby Hoover Dam, which straddles the Arizona-Nevada border

Part of the complex of buildings, dam components, and electrical towers at Hoover Dam, which straddles the Arizona and Nevada borders on the Colorado River

A view of Hoover Dam, which straddles the Arizona and Nevada borders on the Colorado River

Steven Liguori's 1995 bronze sculpture, at Hoover Dam, of Joe Kine, one of the last surviving "high scalers" who worked on the dam project in the early 1930s. The massive Hoover Dam straddles the border between Arizona and Nevada in the Black Canyon of the Colorado River

The pedestrian walkway on the 2010 Mike O'Callaghan-Pat Tillman Memorial Bridge past the massive Hoover Dam

Aerial view of massive Hoover Dam, which straddles the border between Arizona and Nevada in the Black Canyon of the Colorado River, as well as a portion of the dammed river that became Lake Mead, the locus of a widespread national recreation area

Boulder Basin, part of the vast Lake Mead National Recreation area, which was created with the opening of Hoover Dam, straddling the Colorado River between Arizona and Nevada, in the early 1930s. Prior to that time, the small islands seen here were high, rocky mounds, rising above the shallow river. At certain times of the year, Lake Mead's depth can reach 500 feet

One of two decorative "Winged Figures of the Republic" statues, part angel, part symbol of the strength of man, by Norwegian immigrant Oskar J. W. Hansen, at the entrance to the massive Hoover Dam, which straddles the border between Arizona and Nevada in the Black Canyon of th Colorado River

Plaque at Hoover Dam denoting is status as an engineering marvel and noting the Arizona and Nevada borders that it straddles in the Colorado River below

Aerial view of a portion the water and surroundings of Lake Mead, created by the construction of nearby Hoover Dam, which straddles the Arizona-Nevada border

Aerial view of the 2010 Mike O'Callaghan-Pat Tillman Memorial Bridge past the massive Hoover Dam

Arizona plaque in a walkway at Hoover Dam, which straddles the Arizona and Nevada borders on the Colorado River

Part of the complex of buildings, dam components, and electrical towers at Hoover Dam, which straddles the Arizona and Nevada borders on the Colorado River

Decorative "Winged Figures of the Republic" statues, part angel, part symbol of the strength of man, by Norwegian immigrant Oskar W. Hansen, at the entrance to the massive Hoover Dam, which straddles the border between Arizona and Nevada in the Black Canyon of thColorado River

Two of four 338-foot-high intake towers, the nearest of which showing the current time in Arizona, that stand in the deep waters of Lake Mead behind massive Hoover Dam, which straddles the border between Arizona and Nevada in the Black Canyon of the Colorado River

Aerial view of massive Hoover Dam, which straddles the border between Arizona and Nevada in the Black Canyon of the Colorado River, as well as a portion of the dammed river that became Lake Mead, the locus of a widespread national recreation area

Aerial view of a portion the water and surroundings of Lake Mead, created by the construction of nearby Hoover Dam, which straddles the Arizona-Nevada border

Aerial view of electrical towers at massive Hoover Dam, which straddles the border between Arizona and Nevada in the Black Canyon of the Colorado River. Now a popular tourist attraction, the dam's generators provide power for electric utilities as far away as California

Aerial view of a portion the water and surroundings of Lake Mead, created by the construction of nearby Hoover Dam, which straddles the Arizona-Nevada border

Aerial view of the 2010 Mike O'Callaghan-Pat Tillman Memorial Bridge past the massive Hoover Dam

Two of four 338-foot-high intake towers that stand in the deep waters of Lake Mead behind massive Hoover Dam, which straddles the border between Arizona and Nevada in the Black Canyon of the Colorado River. The tower in the foreground shows the current time in Arizona

Two of four 338-foot-high intake towers that stand in the deep waters of Lake Mead behind massive Hoover Dam, which straddles the border between Arizona and Nevada in the Black Canyon of the Colorado River

Aerial view of a portion the water and surroundings of Lake Mead, created by the construction of nearby Hoover Dam, which straddles the Arizona-Nevada border

Aerial view of electrical towers at massive Hoover Dam, which straddles the border between Arizona and Nevada in the Black Canyon of the Colorado River. Now a popular tourist attraction, the dam's generators provide power for electric utilities as far away as California

View of an intake tower at Hoover Dam, which straddles the Arizona and Nevada borders, and the Colorado River that it captures, creating what is now the vast Lake Mead National Recreation Area

Nameplate for the 2010 Mike O'Callaghan-Pat Tillman Memorial Bridge past the massive Hoover Dam

A memorial plaque, honoring the 96 workers known to have died constructing Hoover Dam, which straddles the Arizona and Nevada borders on the Colorado River

Aerial view of a portion the water and surroundings of Lake Mead, created by the construction of nearby Hoover Dam, which straddles the Arizona-Nevada border

Hoover Dam, Promontory Water Tank, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Static Towers & Lines, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Static Towers & Lines, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Static Towers & Lines, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Static Towers & Lines, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Static Towers & Lines, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Static Towers & Lines, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Lower Portal Access Road, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Lower Portal Access Road, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Lower Portal Access Road, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Lower Portal Access Road, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Lower Portal Access Road, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Lower Portal Access Road, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Lower Portal Access Road, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Lower Portal Access Road, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Lower Portal Access Road, U.S. Highway 93, Boulder City, Clark County, NV

Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark County, NV

Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark County, NV

Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark County, NV

Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark County, NV

Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark County, NV

Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark County, NV

Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark County, NV

Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark County, NV

Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark County, NV

Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark County, NV

Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark County, NV

Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark County, NV

Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark County, NV

Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark County, NV

Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark County, NV

Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark County, NV

Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark County, NV