Lakeshore Road, Boulder Basin, Boulder City, Clark County, NV
Significance: Lakeshore Road and associated road features have been determined locally significant under National Register Criteria A and C. Construction of the road opened Lake Mead NRA, an early and major so... More
Lakeshore Road, Boulder Basin, Boulder City, Clark County, NV
Significance: Lakeshore Road and associated road features have been determined locally significant under National Register Criteria A and C. Construction of the road opened Lake Mead NRA, an early and major so... More
Lakeshore Road, Boulder Basin, Boulder City, Clark County, NV
Significance: Lakeshore Road and associated road features have been determined locally significant under National Register Criteria A and C. Construction of the road opened Lake Mead NRA, an early and major so... 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
Holter Hydroelectric Facility, Dam & Power House, End of Holter Dam Ro...
Significance: The Holter Hydroelectric Facility is significant for its association with the industrial development of Montana and the consolidation of most of the state's electric industry into The Montana Powe... More
York Bridge, Federal Aid Secondary Route 280, Helena, Lewis and Clark ...
Significance: As a pin-connected Pennsylvania through truss structure, the bridge is not particularly significant for structural or engineering reasons. It is however, historically associated with the Helena Po... 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
DeGray Creek Bridge, Spanning DeGray Creek at Blish Road (CR 50), Arka...
Significance: The American practice of using pins for bridge connections lasted from the 1860s until the 1920s. DeGray Creek Bridge is the only known surviving pin-connected Pratt pony truss bridge in Arkansas... More
DeGray Creek Bridge, Spanning DeGray Creek at Blish Road (CR 50), Arka...
Significance: The American practice of using pins for bridge connections lasted from the 1860s until the 1920s. DeGray Creek Bridge is the only known surviving pin-connected Pratt pony truss bridge in Arkansas... More
Vancouver Barracks, Truck Storage Garage, East Fifth Street southeast ...
Significance: The Truck Storage Garage, Building No. 304 (currently Building No. 406), is a contributing building to the Vancouver National Historic Reserve District in Vancouver, Washington. The military rese... 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
Holter Hydroelectric Facility, House No. 1, End of Holter Dam Road, Wo...
Significance: The Holter Hydroelectric Facility Historic District is significant as one of the most intact hydroelectric generating plants and operators' camps on the Missouri-Madison Project. House No. 1 contr... 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, 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, 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, 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, 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
Dearborn River High Bridge, Spanning Dearborn River, Augusta, Lewis an...
Significance: The King Bridge Company of Cleveland, Ohio constructed this four-span, half-deck Pratt truss over the Dearborn River in 1897. The half-deck configuration of the bridge is unusual in that the floor... More
Dearborn River High Bridge, Spanning Dearborn River, Augusta, Lewis an...
Significance: The King Bridge Company of Cleveland, Ohio constructed this four-span, half-deck Pratt truss over the Dearborn River in 1897. The half-deck configuration of the bridge is unusual in that the floor... More
Hauser Hydroelectric Facility, Powerhouse, East Bank of Missouri River...
Significance: The Hauser Hydroelectric Facility Historic District is significant for its association with the industrial development of Montana in the early twentieth century and the consolidation of most of th... More
Hauser Hydroelectric Facility, Powerhouse, East Bank of Missouri River...
Significance: The Hauser Hydroelectric Facility Historic District is significant for its association with the industrial development of Montana in the early twentieth century and the consolidation of most of th... 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
Grand Avenue Bridge, Spanning O'Neil Creek at Grand Avenue, Neillsvill...
Significance: One of few ornately decorated iron truss Pratt bridge ever erected in Wisconsin. It was built by the Wisconsin Bridge and Iron Co., one of the leading nineteenth century bridge-building firms. S... More
Grand Avenue Bridge, Spanning O'Neil Creek at Grand Avenue, Neillsvill...
Significance: One of few ornately decorated iron truss Pratt bridge ever erected in Wisconsin. It was built by the Wisconsin Bridge and Iron Co., one of the leading nineteenth century bridge-building firms. S... More
Route No. 1, Overton-Lake Mead Road, Gutters, 6 miles south of Overton...
Significance: The Route No.1 Overton-Lake Mead Road contributed significantly to National Park Service development of the Lake Mead National Recreation Area beginning in 1938. Stone masonry gutters along the r... More
Route No. 1, Overton-Lake Mead Road, Gutters, 6 miles south of Overton...
Significance: The Route No.1 Overton-Lake Mead Road contributed significantly to National Park Service development of the Lake Mead National Recreation Area beginning in 1938. Stone masonry gutters along the r... More
Hemlock Bridge, Spanning Black River on Warner Drive, Greenwood, Clark...
Significance: The Hemlock Bridge is one of six Pennsylvania truss bridges in Wisconsin. It is an example of the early design and practice of the Wisconsin State Highway Commission and of the construction work ... More
Hemlock Bridge, Spanning Black River on Warner Drive, Greenwood, Clark...
Significance: The Hemlock Bridge is one of six Pennsylvania truss bridges in Wisconsin. It is an example of the early design and practice of the Wisconsin State Highway Commission and of the construction work ... More
Hemlock Bridge, Spanning Black River on Warner Drive, Greenwood, Clark...
Significance: The Hemlock Bridge is one of six Pennsylvania truss bridges in Wisconsin. It is an example of the early design and practice of the Wisconsin State Highway Commission and of the construction work ... More
Hemlock Bridge, Spanning Black River on Warner Drive, Greenwood, Clark...
Significance: The Hemlock Bridge is one of six Pennsylvania truss bridges in Wisconsin. It is an example of the early design and practice of the Wisconsin State Highway Commission and of the construction work ... 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
Route No. 1-Overton-Lake Mead Road, Culverts and Headwalls, 6 miles so...
Significance: The Route No. 1 Overton-Lake Mead Road contributed significantly to National park Service development of the Lake Mead National Recreation Area beginning in 1938. Stone masonry culvert headwalls a... More
Route No. 1-Overton-Lake Mead Road, Culverts and Headwalls, 6 miles so...
Significance: The Route No. 1 Overton-Lake Mead Road contributed significantly to National park Service development of the Lake Mead National Recreation Area beginning in 1938. Stone masonry culvert headwalls a... More
Route No. 1-Overton-Lake Mead Road, Culverts and Headwalls, 6 miles so...
Significance: The Route No. 1 Overton-Lake Mead Road contributed significantly to National park Service development of the Lake Mead National Recreation Area beginning in 1938. Stone masonry culvert headwalls a... More
Route No. 1-Overton-Lake Mead Road, Culverts and Headwalls, 6 miles so...
Significance: The Route No. 1 Overton-Lake Mead Road contributed significantly to National park Service development of the Lake Mead National Recreation Area beginning in 1938. Stone masonry culvert headwalls a... More
Holter Hydroelectric Facility, Mechanic's Garage, End of Holter Dam Ro...
Significance: The Holter Hydroelectric Facility Historic District is significant as one of the most intact hydroelectric generating plants and operators' camps on the Missouri-Madison Project. The garage contri... 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
Bureau of Mines Metallurgical Research Laboratory, Original Building, ...
Significance: Building 200, as part of the Date Street Complex, was part of the Bureau of Mines Electrometallurgical Research Facility located in Boulder City. As such, it is within the designated Boulder City... More
Bureau of Mines Metallurgical Research Laboratory, Original Building, ...
Significance: Building 200, as part of the Date Street Complex, was part of the Bureau of Mines Electrometallurgical Research Facility located in Boulder City. As such, it is within the designated Boulder City... More
Bureau of Mines Metallurgical Research Laboratory, Original Building, ...
Significance: Building 200, as part of the Date Street Complex, was part of the Bureau of Mines Electrometallurgical Research Facility located in Boulder City. As such, it is within the designated Boulder City... More
Missouri River Bridge, Spanning Missouri River at Bridge Street, Craig...
Significance: The Missouri River Bridge at Craig was the second vehicular bridge constructed across the Missouri River in Montana. It provided access to the Montana Central Railroad station at Craig for the fa... 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
Lakeshore Road, Boulder Basin, Boulder City, Clark County, NV
Significance: Lakeshore Road and associated road features have been determined locally significant under National Register Criteria A and C. Construction of the road opened Lake Mead NRA, an early and major so... 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, 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
Holter Hydroelectric Facility, Dam & Power House, End of Holter Dam Ro...
Significance: The Holter Hydroelectric Facility is significant for its association with the industrial development of Montana and the consolidation of most of the state's electric industry into The Montana Powe... 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, 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, 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, Nevada Downstream Waste Tailings, Near the Lower Portal Tu...
Significance: They were an important feature in the construction of Hoover Dam. The tailings resulted from excavation of tunnels for diversion of the Colorado River, for penstock and spillway facilities, for lo... More
Hoover Dam, Nevada Downstream Waste Tailings, Near the Lower Portal Tu...
Significance: They were an important feature in the construction of Hoover Dam. The tailings resulted from excavation of tunnels for diversion of the Colorado River, for penstock and spillway facilities, for lo... More
DeGray Creek Bridge, Spanning DeGray Creek at Blish Road (CR 50), Arka...
Significance: The American practice of using pins for bridge connections lasted from the 1860s until the 1920s. DeGray Creek Bridge is the only known surviving pin-connected Pratt pony truss bridge in Arkansas... More
Vancouver Barracks, Truck Storage Garage, East Fifth Street southeast ...
Significance: The Truck Storage Garage, Building No. 304 (currently Building No. 406), is a contributing building to the Vancouver National Historic Reserve District in Vancouver, Washington. The military rese... 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
Holter Hydroelectric Facility, House No. 8, End of Holter Dam Road, Wo...
Significance: The Holter Hydroelectric Facility Historic District is significant as one of the most intact hydroelectric generating plants and operators' camps on the Missouri-Madison Project. House No. 8 contr... 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
Holter Hydroelectric Facility, House No. 1, End of Holter Dam Road, Wo...
Significance: The Holter Hydroelectric Facility Historic District is significant as one of the most intact hydroelectric generating plants and operators' camps on the Missouri-Madison Project. House No. 1 contr... 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
Muddy River Bridge, Spanning Muddy River northeast of I-15 & State Rou...
Significance: The Muddy River Bridge is the best example of a thru "pony" truss bridge in Nevada. It is one of six truss bridges (three of which are pony trusses) still on the NDOT inventory. This constructio... More
Muddy River Bridge, Spanning Muddy River northeast of I-15 & State Rou...
Significance: The Muddy River Bridge is the best example of a thru "pony" truss bridge in Nevada. It is one of six truss bridges (three of which are pony trusses) still on the NDOT inventory. This constructio... More
Muddy River Bridge, Spanning Muddy River northeast of I-15 & State Rou...
Significance: The Muddy River Bridge is the best example of a thru "pony" truss bridge in Nevada. It is one of six truss bridges (three of which are pony trusses) still on the NDOT inventory. This constructio... More
Route No. 1 Overton-Lake Mead Road, Dikes & Ditches, Between Overton B...
Significance: The Route No.1 Overton-Lake Mead Road contributed significantly to National Park Service development of the Lake Mead National Recreation Area beginning in 1938. Dikes and ditches were a critical ... 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
Dearborn River High Bridge, Spanning Dearborn River, Augusta, Lewis an...
Significance: The King Bridge Company of Cleveland, Ohio constructed this four-span, half-deck Pratt truss over the Dearborn River in 1897. The half-deck configuration of the bridge is unusual in that the floor... More
Hauser Hydroelectric Facility, Powerhouse, East Bank of Missouri River...
Significance: The Hauser Hydroelectric Facility Historic District is significant for its association with the industrial development of Montana in the early twentieth century and the consolidation of most of th... More
Route No. 1-Overton-Lake Mead Road, Station Markers, 6 miles south of ...
Significance: The Route No. 1 Overton-Lake Mead Road contributed significantly to National Park Service development of the Lake Mead National Recreation Area beginning in 1938. Station Markers were established ... More
Holter Hydroelectric Facility, House No. 4, End of Holter Dam Road, Wo...
Significance: The Holter Hydroelectric Facility Historic District is significant as one of the most intact hydroelectric generating plants and operators' camps on the Missouri-Madison Project. House No. 4 contr... More
Holter Hydroelectric Facility, House No. 4, End of Holter Dam Road, Wo...
Significance: The Holter Hydroelectric Facility Historic District is significant as one of the most intact hydroelectric generating plants and operators' camps on the Missouri-Madison Project. House No. 4 contr... 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, 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, 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
Grand Avenue Bridge, Spanning O'Neil Creek at Grand Avenue, Neillsvill...
Significance: One of few ornately decorated iron truss Pratt bridge ever erected in Wisconsin. It was built by the Wisconsin Bridge and Iron Co., one of the leading nineteenth century bridge-building firms. S... 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
Route No. 1, Overton-Lake Mead Road, Gutters, 6 miles south of Overton...
Significance: The Route No.1 Overton-Lake Mead Road contributed significantly to National Park Service development of the Lake Mead National Recreation Area beginning in 1938. Stone masonry gutters along the r... More
Hemlock Bridge, Spanning Black River on Warner Drive, Greenwood, Clark...
Significance: The Hemlock Bridge is one of six Pennsylvania truss bridges in Wisconsin. It is an example of the early design and practice of the Wisconsin State Highway Commission and of the construction work ... More
Hemlock Bridge, Spanning Black River on Warner Drive, Greenwood, Clark...
Significance: The Hemlock Bridge is one of six Pennsylvania truss bridges in Wisconsin. It is an example of the early design and practice of the Wisconsin State Highway Commission and of the construction work ... More
Route No. 1-Overton-Lake Mead Road, Culverts and Headwalls, 6 miles so...
Significance: The Route No. 1 Overton-Lake Mead Road contributed significantly to National park Service development of the Lake Mead National Recreation Area beginning in 1938. Stone masonry culvert headwalls a... More
Route No. 1-Overton-Lake Mead Road, Culverts and Headwalls, 6 miles so...
Significance: The Route No. 1 Overton-Lake Mead Road contributed significantly to National park Service development of the Lake Mead National Recreation Area beginning in 1938. Stone masonry culvert headwalls a... More
Holter Hydroelectric Facility, Mechanic's Garage, End of Holter Dam Ro...
Significance: The Holter Hydroelectric Facility Historic District is significant as one of the most intact hydroelectric generating plants and operators' camps on the Missouri-Madison Project. The garage contri... 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
Bureau of Mines Metallurgical Research Laboratory, Original Building, ...
Significance: Building 200, as part of the Date Street Complex, was part of the Bureau of Mines Electrometallurgical Research Facility located in Boulder City. As such, it is within the designated Boulder City... More