Close-up view of Hoover Dam, which straddles the Arizona and Nevada bo...
Called Boulder Dam from the date of its dedication in 1935, the concrete-arch dam was renamed after former U.S. president Herbert Hoover in 1947. Now a popular tourist attraction, the dam's generators provide p... More
Aerial view of a portion the water and surroundings of Lake Mead, crea...
The dam harnessed the Colorado River to create the widespread reservoir in the early 1930s. Lake Mead became the locus of a widespread national recreation area, popular with boaters and fishers. Title, date and... More
Hoover Dam, Static Towers & Lines, U.S. Highway 93, Boulder City, Clar...
Significance: It was constructed as an integral part of the control and protection system for the Hoover Dam switchyard complex, to protect the switchyards and transformer circuits from lightning strikes. Surv... More
Hoover Dam, Static Towers & Lines, U.S. Highway 93, Boulder City, Clar...
Significance: It was constructed as an integral part of the control and protection system for the Hoover Dam switchyard complex, to protect the switchyards and transformer circuits from lightning strikes. Surv... More
Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark C...
Significance: It is a National Historic Landmark, an American Civil Engineering Landmark, and the focus of an historic district listed on the National Register of Historic Places. The dam was constructed betwee... More
Hoover Dam, Explosives Magazines, About 75 feet west of Lower Portal T...
Significance: These two explosive magazines were constructed for storage of dynamite used in the early phases of construction of Hoover Dam, possibly as early as 1931 for blasting the route of the Lower Portal ... More
Hoover Dam, Explosives Magazines, About 75 feet west of Lower Portal T...
Significance: These two explosive magazines were constructed for storage of dynamite used in the early phases of construction of Hoover Dam, possibly as early as 1931 for blasting the route of the Lower Portal ... More
Hoover Dam, Arizona-Nevada Switchyard, U.S. Highway 93, Boulder City, ...
Significance: It is one of six switchyards built between 1935 and 1952 to provide terminals for major transmission lines carrying electricity to markets in California, Nevada, and Arizona. All of these faciliti... More
Hoover Dam, Arizona-Nevada Switchyard, U.S. Highway 93, Boulder City, ...
Significance: It is one of six switchyards built between 1935 and 1952 to provide terminals for major transmission lines carrying electricity to markets in California, Nevada, and Arizona. All of these faciliti... More
Hoover Dam, Los Angeles Relay Control Building, U.S. Highway 93, Bould...
Significance: It was a critical element of the Hoover Dam electrical generation and transmission system. Although it was associated by name with the Los Angeles Bureau of Power and Light 387.5/275 switchyard, t... More
Hoover Dam, Southern California Edison 138-KV Switchyard, U.S. Highway...
Significance: It was the second of six major Federal switchyards built at Hoover Dam. The switchyard was built to replace the Southern Sierras Power Company substation that had provided electricity for construc... More
Hoover Dam, Cable Hoist House, U.S. Highway 93, Boulder City, Clark Co...
Significance: It provided access to control cable tunnels from the power plant to the switchyard relay house, and a transformer in the lower level of the hoist house provided operating electricity to the switch... More
Hoover Dam, Los Angeles Bureau of Power & Light Lines 1-3, U.S. Highwa...
Significance: The transmission lines included pioneering technology in high-voltage transmission. The lines were crucial elements of the Hoover Dam electrical complex, particularly in the role played by Hoover ... More
Hoover Dam, Los Angeles Bureau of Power & Light Lines 1-3, U.S. Highwa...
Significance: The transmission lines included pioneering technology in high-voltage transmission. The lines were crucial elements of the Hoover Dam electrical complex, particularly in the role played by Hoover ... More
Hoover Dam, Metropolitan Water District Switchyard, U.S. Highway 93, B...
Significance: It was the second-largest Federal switchyard at Hoover Dam, the switchyard provided needed power for expansion of irrigation and municipal water supplies in California during and after WWII, but i... More
Hoover Dam, Southern California Edison 230-KV Switchyard, U.S. Highway...
Significance: It was an integral element of the Hoover Dam electrical generation and transmission system. This switchyard provided much-needed electricity during WWII to power Douglas, Vultee, and Northrup airc... More
Hoover Dam, Los Angeles Switch Yard, U.S. Highway 93, Boulder City, Cl...
Significance: It was the first and largest of the six major Federal switchyards at Hoover Dam. When the first stage of the switchyard began operations in 1936, it provided electricity at the highest voltages ev... More
Aerial views of Lake Mead National Recreation Area, formed when Hoover...
Digital image produced by Carol M. Highsmith to represent her original film transparency; some details may differ between the film and the digital images. Title, date, and keywords provided by the photographer.... More
Aerial view of Hoover Dam, Nevada
Digital image produced by Carol M. Highsmith to represent her original film transparency; some details may differ between the film and the digital images. Title, date, and keywords provided by the photographer.... More
Aerial view of massive Hoover Dam, which straddles the border between ...
Called Boulder Dam from the date of its dedication in 1935, the concrete-arch dam was renamed after former U.S. president Herbert Hoover in 1947. Now a popular tourist attraction, the dam's generators provide p... More
Two of four 338-foot-high intake towers that stand in the deep waters ...
Called Boulder Dam from the date of its dedication in 1935, the concrete-arch dam was renamed after former U.S. president Herbert Hoover in 1947. Now a popular tourist attraction, the dam's generators provide p... More
Hoover Dam, Static Towers & Lines, U.S. Highway 93, Boulder City, Clar...
Significance: It was constructed as an integral part of the control and protection system for the Hoover Dam switchyard complex, to protect the switchyards and transformer circuits from lightning strikes. Surv... More
Hoover Dam, Lower Portal Access Road, U.S. Highway 93, Boulder City, C...
Significance: It was an important feature in the construction of Hoover Dam. The road provided access to the bottom of Black Canyon at a point about one mile downstream from the dam construction site. Here a co... More
Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark C...
Significance: It is a National Historic Landmark, an American Civil Engineering Landmark, and the focus of an historic district listed on the National Register of Historic Places. The dam was constructed betwee... More
Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark C...
Significance: It is a National Historic Landmark, an American Civil Engineering Landmark, and the focus of an historic district listed on the National Register of Historic Places. The dam was constructed betwee... More
Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark C...
Significance: It is a National Historic Landmark, an American Civil Engineering Landmark, and the focus of an historic district listed on the National Register of Historic Places. The dam was constructed betwee... More
Hoover Dam, Henderson-Mead Transmission Line 2, Spanning Colorado Rive...
STORED OFF SITE AND ON SITE. mchr Significance: Previously known as a segment of the Davis-Hoover and the Hoover-Mead Transmission Lines, the documented segment of the Henderson-Mead Transmission Line 2 was con... More
Hoover Dam, Arizona-Nevada Switchyard, U.S. Highway 93, Boulder City, ...
Significance: It is one of six switchyards built between 1935 and 1952 to provide terminals for major transmission lines carrying electricity to markets in California, Nevada, and Arizona. All of these faciliti... More
Hoover Dam, Los Angeles Relay Control Building, U.S. Highway 93, Bould...
Significance: It was a critical element of the Hoover Dam electrical generation and transmission system. Although it was associated by name with the Los Angeles Bureau of Power and Light 387.5/275 switchyard, t... More
Hoover Dam, Cable Hoist House, U.S. Highway 93, Boulder City, Clark Co...
Significance: It provided access to control cable tunnels from the power plant to the switchyard relay house, and a transformer in the lower level of the hoist house provided operating electricity to the switch... More
Hoover Dam, Metropolitan Water District Switchyard, U.S. Highway 93, B...
Significance: It was the second-largest Federal switchyard at Hoover Dam, the switchyard provided needed power for expansion of irrigation and municipal water supplies in California during and after WWII, but i... More
Hoover Dam, Metropolitan Water District Switchyard, U.S. Highway 93, B...
Significance: It was the second-largest Federal switchyard at Hoover Dam, the switchyard provided needed power for expansion of irrigation and municipal water supplies in California during and after WWII, but i... More
Hoover Dam, Metropolitan Water District Switchyard, U.S. Highway 93, B...
Significance: It was the second-largest Federal switchyard at Hoover Dam, the switchyard provided needed power for expansion of irrigation and municipal water supplies in California during and after WWII, but i... More
Hoover Dam, Circuits 1-15, U.S. Highway 93, Boulder City, Clark County...
Significance: Transformer Circuits are integral elements of the Hoover Dam electrical generation and transmission system. The circuits contributed to the importance of Hoover Dam power in the WWII and post-war ... More
Hoover Dam, Circuits 1-15, U.S. Highway 93, Boulder City, Clark County...
Significance: Transformer Circuits are integral elements of the Hoover Dam electrical generation and transmission system. The circuits contributed to the importance of Hoover Dam power in the WWII and post-war ... More
Hoover Dam, Circuits 1-15, U.S. Highway 93, Boulder City, Clark County...
Significance: Transformer Circuits are integral elements of the Hoover Dam electrical generation and transmission system. The circuits contributed to the importance of Hoover Dam power in the WWII and post-war ... More
Massive Hoover Dam, which straddles the Arizona and Nevada borders on ...
Called Boulder Dam from the date of its dedication in 1935, the concrete-arch dam was renamed after former U.S. president Herbert Hoover in 1947. Now a popular tourist attraction, the dam's generators provide p... More
Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark C...
Significance: It is a National Historic Landmark, an American Civil Engineering Landmark, and the focus of an historic district listed on the National Register of Historic Places. The dam was constructed betwee... More
Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark C...
Significance: It is a National Historic Landmark, an American Civil Engineering Landmark, and the focus of an historic district listed on the National Register of Historic Places. The dam was constructed betwee... More
Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark C...
Significance: It is a National Historic Landmark, an American Civil Engineering Landmark, and the focus of an historic district listed on the National Register of Historic Places. The dam was constructed betwee... More
Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark C...
Significance: It is a National Historic Landmark, an American Civil Engineering Landmark, and the focus of an historic district listed on the National Register of Historic Places. The dam was constructed betwee... More
Hoover Dam, Arizona-Nevada Switchyard, U.S. Highway 93, Boulder City, ...
Significance: It is one of six switchyards built between 1935 and 1952 to provide terminals for major transmission lines carrying electricity to markets in California, Nevada, and Arizona. All of these faciliti... More
Hoover Dam, Arizona-Nevada Switchyard, U.S. Highway 93, Boulder City, ...
Significance: It is one of six switchyards built between 1935 and 1952 to provide terminals for major transmission lines carrying electricity to markets in California, Nevada, and Arizona. All of these faciliti... More
Hoover Dam, Arizona-Nevada Switchyard, U.S. Highway 93, Boulder City, ...
Significance: It is one of six switchyards built between 1935 and 1952 to provide terminals for major transmission lines carrying electricity to markets in California, Nevada, and Arizona. All of these faciliti... More
Hoover Dam, Los Angeles Relay Control Building, U.S. Highway 93, Bould...
Significance: It was a critical element of the Hoover Dam electrical generation and transmission system. Although it was associated by name with the Los Angeles Bureau of Power and Light 387.5/275 switchyard, t... More
Hoover Dam, Nevada State Switchyard, U.S. Highway 93, Boulder City, Cl...
Significance: It was the smallest of the six major Federal switchyards at Hoover Dam. This switchyard was constructed to be the principal point at which Nevada's allocation of power from Hoover Dam could be del... More
Hoover Dam, Nevada State Switchyard, U.S. Highway 93, Boulder City, Cl...
Significance: It was the smallest of the six major Federal switchyards at Hoover Dam. This switchyard was constructed to be the principal point at which Nevada's allocation of power from Hoover Dam could be del... More
Hoover Dam, Los Angeles Bureau of Power & Light Lines 1-3, U.S. Highwa...
Significance: The transmission lines included pioneering technology in high-voltage transmission. The lines were crucial elements of the Hoover Dam electrical complex, particularly in the role played by Hoover ... More
Hoover Dam, U.S. Highway 93 Arizona Segment, U.S. Highway 93, Boulder ...
Public domain photograph - historical image of Arizona, United States, free to use, no copyright restrictions image - Picryl description
Hoover Dam, Southern California Edison 230-KV Switchyard, U.S. Highway...
Significance: It was an integral element of the Hoover Dam electrical generation and transmission system. This switchyard provided much-needed electricity during WWII to power Douglas, Vultee, and Northrup airc... More
Hoover Dam, U.S. Construction Railroad, U.S. Highway 93, Boulder City,...
Significance: The railroad was one of three railroads built and operated specifically to support construction of Hoover Dam and the power plant at the toe of the dam. Survey number: HAER NV-27-Q National Regi... More
Hoover Dam, Los Angeles Switch Yard, U.S. Highway 93, Boulder City, Cl...
Significance: It was the first and largest of the six major Federal switchyards at Hoover Dam. When the first stage of the switchyard began operations in 1936, it provided electricity at the highest voltages ev... More
Hoover Dam, Circuits 1-15, U.S. Highway 93, Boulder City, Clark County...
Significance: Transformer Circuits are integral elements of the Hoover Dam electrical generation and transmission system. The circuits contributed to the importance of Hoover Dam power in the WWII and post-war ... More
Hoover Dam, Circuits 1-15, U.S. Highway 93, Boulder City, Clark County...
Significance: Transformer Circuits are integral elements of the Hoover Dam electrical generation and transmission system. The circuits contributed to the importance of Hoover Dam power in the WWII and post-war ... More
Aerial view of Hoover Dam, Nevada
Digital image produced by Carol M. Highsmith to represent her original film transparency; some details may differ between the film and the digital images. Title, date, and keywords provided by the photographer.... More
Hoover Dam, Lower Portal Access Road, U.S. Highway 93, Boulder City, C...
Significance: It was an important feature in the construction of Hoover Dam. The road provided access to the bottom of Black Canyon at a point about one mile downstream from the dam construction site. Here a co... More
Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark C...
Significance: It is a National Historic Landmark, an American Civil Engineering Landmark, and the focus of an historic district listed on the National Register of Historic Places. The dam was constructed betwee... More
Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark C...
Significance: It is a National Historic Landmark, an American Civil Engineering Landmark, and the focus of an historic district listed on the National Register of Historic Places. The dam was constructed betwee... More
Hoover Dam, Arizona-Nevada Switchyard, U.S. Highway 93, Boulder City, ...
Significance: It is one of six switchyards built between 1935 and 1952 to provide terminals for major transmission lines carrying electricity to markets in California, Nevada, and Arizona. All of these faciliti... More
Hoover Dam, Arizona-Nevada Switchyard, U.S. Highway 93, Boulder City, ...
Significance: It is one of six switchyards built between 1935 and 1952 to provide terminals for major transmission lines carrying electricity to markets in California, Nevada, and Arizona. All of these faciliti... More
Hoover Dam, Los Angeles Relay Control Building, U.S. Highway 93, Bould...
Significance: It was a critical element of the Hoover Dam electrical generation and transmission system. Although it was associated by name with the Los Angeles Bureau of Power and Light 387.5/275 switchyard, t... More
Hoover Dam, Southern California Edison 138-KV Switchyard, U.S. Highway...
Significance: It was the second of six major Federal switchyards built at Hoover Dam. The switchyard was built to replace the Southern Sierras Power Company substation that had provided electricity for construc... More
Hoover Dam, Kingman Switchyard, U.S. Highway 93, Boulder City, Clark C...
Significance: It was constructed in 1938 to provide Hoover Dam electricity to Kingman and surrounding areas of Arizona. This is the only switchyard built entirely by a utility, rather than the Bureau of Reclama... More
Hoover Dam, Los Angeles Bureau of Power & Light Lines 1-3, U.S. Highwa...
Significance: The transmission lines included pioneering technology in high-voltage transmission. The lines were crucial elements of the Hoover Dam electrical complex, particularly in the role played by Hoover ... More
Hoover Dam, Metropolitan Water District Switchyard, U.S. Highway 93, B...
Significance: It was the second-largest Federal switchyard at Hoover Dam, the switchyard provided needed power for expansion of irrigation and municipal water supplies in California during and after WWII, but i... More
Hoover Dam, Metropolitan Water District Switchyard, U.S. Highway 93, B...
Significance: It was the second-largest Federal switchyard at Hoover Dam, the switchyard provided needed power for expansion of irrigation and municipal water supplies in California during and after WWII, but i... More
Hoover Dam, Hoover-Basic Magnesium North & South Lines, U.S. Highway 9...
Significance: The transmission lines served a vital function during WWII by providing electricity generated at Hoover Dam to the Basic Magnesium plant to the south of Las Vegas. After the war, these transmissio... More
Hoover Dam, U.S. Construction Railroad, U.S. Highway 93, Boulder City,...
Significance: The railroad was one of three railroads built and operated specifically to support construction of Hoover Dam and the power plant at the toe of the dam. Survey number: HAER NV-27-Q National Regi... More
Hoover Dam, U.S. Construction Railroad, U.S. Highway 93, Boulder City,...
Significance: The railroad was one of three railroads built and operated specifically to support construction of Hoover Dam and the power plant at the toe of the dam. Survey number: HAER NV-27-Q National Regi... More
Hoover Dam, U.S. Construction Railroad, U.S. Highway 93, Boulder City,...
Significance: The railroad was one of three railroads built and operated specifically to support construction of Hoover Dam and the power plant at the toe of the dam. Survey number: HAER NV-27-Q National Regi... More
Hoover Dam, Los Angeles Switch Yard, U.S. Highway 93, Boulder City, Cl...
Significance: It was the first and largest of the six major Federal switchyards at Hoover Dam. When the first stage of the switchyard began operations in 1936, it provided electricity at the highest voltages ev... More
Hoover Dam, Los Angeles Switch Yard, U.S. Highway 93, Boulder City, Cl...
Significance: It was the first and largest of the six major Federal switchyards at Hoover Dam. When the first stage of the switchyard began operations in 1936, it provided electricity at the highest voltages ev... More
Hoover Dam, Metropolitan Water District Line 1, U.S. Highway 93, Bould...
Significance: The transmission line was a critical element of the Hoover Dam electrical generation and transmission system. The line provided Hoover Dam power for development of irrigation and municipal water d... More
Hoover Dam, Metropolitan Water District Line 1, U.S. Highway 93, Bould...
Significance: The transmission line was a critical element of the Hoover Dam electrical generation and transmission system. The line provided Hoover Dam power for development of irrigation and municipal water d... More
Hoover Dam, Circuits 1-15, U.S. Highway 93, Boulder City, Clark County...
Significance: Transformer Circuits are integral elements of the Hoover Dam electrical generation and transmission system. The circuits contributed to the importance of Hoover Dam power in the WWII and post-war ... More
Hoover Dam, Circuits 1-15, U.S. Highway 93, Boulder City, Clark County...
Significance: Transformer Circuits are integral elements of the Hoover Dam electrical generation and transmission system. The circuits contributed to the importance of Hoover Dam power in the WWII and post-war ... More
Lake Mead National Recreation Area, formed when Boulder Dam (now Hoove...
Digital image produced by Carol M. Highsmith to represent her original film transparency; some details may differ between the film and the digital images. Title, date, and keywords provided by the photographer.... More
Aerial view of a portion the water and surroundings of Lake Mead, crea...
The dam harnessed the Colorado River to create the widespread reservoir in the early 1930s. Lake Mead became the locus of a widespread national recreation area, popular with boaters and fishers. Title, date and... More
Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark C...
Significance: It is a National Historic Landmark, an American Civil Engineering Landmark, and the focus of an historic district listed on the National Register of Historic Places. The dam was constructed betwee... More
Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark C...
Significance: It is a National Historic Landmark, an American Civil Engineering Landmark, and the focus of an historic district listed on the National Register of Historic Places. The dam was constructed betwee... More
Hoover Dam, U.S. Highway 93 Nevada Segment, U.S. Highway 93, Boulder C...
Significance: This segment of U.S. Highway 93 was constructed by Six Companies, Inc., as a finishing element to Hoover Dam. The segment includes stone parapet walls built in 1932 that display extruded-mortar st... More
Hoover Dam, U.S. Highway 93 Nevada Segment, U.S. Highway 93, Boulder C...
Significance: This segment of U.S. Highway 93 was constructed by Six Companies, Inc., as a finishing element to Hoover Dam. The segment includes stone parapet walls built in 1932 that display extruded-mortar st... More
Hoover Dam, Cable Hoist House, U.S. Highway 93, Boulder City, Clark Co...
Significance: It provided access to control cable tunnels from the power plant to the switchyard relay house, and a transformer in the lower level of the hoist house provided operating electricity to the switch... More
Hoover Dam, Los Angeles Bureau of Power & Light Lines 1-3, U.S. Highwa...
Significance: The transmission lines included pioneering technology in high-voltage transmission. The lines were crucial elements of the Hoover Dam electrical complex, particularly in the role played by Hoover ... More
Hoover Dam, Los Angeles Bureau of Power & Light Lines 1-3, U.S. Highwa...
Significance: The transmission lines included pioneering technology in high-voltage transmission. The lines were crucial elements of the Hoover Dam electrical complex, particularly in the role played by Hoover ... More
Hoover Dam, Southern California Edison 230-KV Switchyard, U.S. Highway...
Significance: It was an integral element of the Hoover Dam electrical generation and transmission system. This switchyard provided much-needed electricity during WWII to power Douglas, Vultee, and Northrup airc... More
Hoover Dam, Southern California Edison 230-KV Switchyard, U.S. Highway...
Significance: It was an integral element of the Hoover Dam electrical generation and transmission system. This switchyard provided much-needed electricity during WWII to power Douglas, Vultee, and Northrup airc... More
Hoover Dam, Metropolitan Water District Line 1, U.S. Highway 93, Bould...
Significance: The transmission line was a critical element of the Hoover Dam electrical generation and transmission system. The line provided Hoover Dam power for development of irrigation and municipal water d... More
Hoover Dam, Circuits 1-15, U.S. Highway 93, Boulder City, Clark County...
Significance: Transformer Circuits are integral elements of the Hoover Dam electrical generation and transmission system. The circuits contributed to the importance of Hoover Dam power in the WWII and post-war ... More
Hoover Dam, Circuits 1-15, U.S. Highway 93, Boulder City, Clark County...
Significance: Transformer Circuits are integral elements of the Hoover Dam electrical generation and transmission system. The circuits contributed to the importance of Hoover Dam power in the WWII and post-war ... More
Hoover Dam, Circuits 1-15, U.S. Highway 93, Boulder City, Clark County...
Significance: Transformer Circuits are integral elements of the Hoover Dam electrical generation and transmission system. The circuits contributed to the importance of Hoover Dam power in the WWII and post-war ... More
Aerial view of Hoover Dam near Boulder City, Nevada
Digital image produced by Carol M. Highsmith to represent her original film transparency; some details may differ between the film and the digital images. Title, date, and keywords provided by the photographer.... More
Aerial view of Hoover Dam, near Boulder City, Nevada
Digital image produced by Carol M. Highsmith to represent her original film transparency; some details may differ between the film and the digital images. Title, date, and keywords provided by the photographer.... More
Lake Mead National Recreation Area, formed when Boulder Dam (now Hoove...
Digital image produced by Carol M. Highsmith to represent her original film transparency; some details may differ between the film and the digital images. Title, date, and keywords provided by the photographer.... More
Aerial view of a portion the water and surroundings of Lake Mead, crea...
The dam harnessed the Colorado River to create the widespread reservoir in the early 1930s. Lake Mead became the locus of a widespread national recreation area, popular with boaters and fishers. Title, date and... More
Hoover Dam, Lower Portal Access Road, U.S. Highway 93, Boulder City, C...
Significance: It was an important feature in the construction of Hoover Dam. The road provided access to the bottom of Black Canyon at a point about one mile downstream from the dam construction site. Here a co... More
Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark C...
Significance: It is a National Historic Landmark, an American Civil Engineering Landmark, and the focus of an historic district listed on the National Register of Historic Places. The dam was constructed betwee... More
Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark C...
Significance: It is a National Historic Landmark, an American Civil Engineering Landmark, and the focus of an historic district listed on the National Register of Historic Places. The dam was constructed betwee... More
Hoover Dam, Arizona-Nevada Switchyard, U.S. Highway 93, Boulder City, ...
Significance: It is one of six switchyards built between 1935 and 1952 to provide terminals for major transmission lines carrying electricity to markets in California, Nevada, and Arizona. All of these faciliti... More
Hoover Dam, Los Angeles Relay Control Building, U.S. Highway 93, Bould...
Significance: It was a critical element of the Hoover Dam electrical generation and transmission system. Although it was associated by name with the Los Angeles Bureau of Power and Light 387.5/275 switchyard, t... More