Hoover Dam, Los Angeles Relay Control Building, U.S. Highway 93, Boulder City

Source document Quoted word for word from HAER NV-27-H. Not written, edited or summarised by this site.

U.S. Highway 93 Vicinity of Boulder City Clark County Nevada USGS Hoover Dam, Nevada-Arizona 7.5 Minute Provisional UTM Coordinates: 1 l Date of Construction: Engineer: U.S. Bureau of Reclamation Builder: U.S. Bureau of Reclamation U.S. Highway 93 Vicinity of Boulder City Clark County Nevada USGS Hoover Dam, Nevada-Arizona 7.5 Minute Provisional UTM Coordinates: l Statement of

Source document Quoted word for word from HAER NV-27-H. Not written, edited or summarised by this site.

The Los Angeles Relay Control Building 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 switchyard, the relay control building included equipment for monitoring and controlling all six of the major federal switchyards at Hoover Dam. Report Prepared by: Associated Cultural Resource Experts (ACRE) Sangre de Cristo Road, STE 202 Littleton, CO Date: April HISTORIC AMERICAN ENGINEERNG RECORD HOOVER DAM, LOS ANGELES RELAY CONTROL BUILDING HAER NO. (Page 2) The Los Angeles Relay Control Building 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 switchyard, the relay control building included equipment for monitoring and controlling all six of the major federal switchyards at Hoover Dam. Description: The relay house was constructed of reinforced concrete and is long, wide, and high above ground level. The basement level shares the same dimensions as the ground level and is deep from ground level. Interior walls are metal lath and plaster. A blower system in the basement brought air from the power plant through the inclined tunnel and the box conduit to cool the building. The ground floor includes offices, relay metering and control boards, a toilet, and a workroom and storage area.

The lower level contains a battery area, a transformer room, cable banks, and entries to the control-cable tunnels. Exterior and interior features of the relay house corresponded to Moderne Style characteristics applied to Hoover Dam, the hoist house, and other project structures. The relay house and hoist house may have been designed by George Kaufmann, the architect for Hoover Dam, but definite evidence of this has not been found. History: The relay house was one of the first elements built for the Hoover Dam switchyard complex. Walls of the relay house had been poured to the level of the roof by August and the building was essentially completed by the end of that year.

The relay house went into operation in when the first Los Angeles Switchyard bay was activated to provide power to the first Los Angeles transmission line. Relay monitoring and control equipment was expanded and changed in the relay house as additional switchyards were completed and activated. The relay house building is virtually unchanged since construction in The battery and battery charger system in the lower level were replaced in Beginning in extensive changes were made to control cables and control, relay, and metering equipment within the relay house in preparation for transfer of control to Mead Substation. Relay functions ceased in this building by the late Thereafter, the building was used sporadically for storage and as offices for the Hoover Dam security forces.

Source document Quoted word for word from HAER NV-27-H. Not written, edited or summarised by this site.

This documentation of features of Hoover Dam and associated structures was accomplished by Associated Cultural Resource Experts (ACRE). ACRE completed documentation of21 features in October Documentation on four linear features was extended and an additional 3 features were newly documented in February Both phases of documentation were conducted as part of the historical/engineering recordation of Hoover Dam-prepared for the Department of Energy, Western Area Power Administration; Bureau of Reclamation; and Federal Highway Administration-that includes a narrative for the Addendum to Hoover Dam and individual documentation of 25 features located at the Hoover Dam facility, photo documentation, and documentation of existing historic photographs and site plans.

The recordation conforms to the standards of the Historic American Engineering Record, U.S. Department of the Interior. Other reports in the HAER collection completed for these projects are a narrative for the Addendum to Hoover Dam and 24 short forms for individual structures: Hoover Dam, Los Angeles Switchyard (NV-27-A); Hoover Dam, Southern Sierras/CEP/Southern California Edison HOOVER DAM, LOS ANGELES RELAY CONTROL BUILDING HAER NO.

(Page 3) Switchyard Hoover Dam, Metropolitan Water District Switchyard Hoover Dam, State of Nevada Switchyard Hoover Dam, Southern California Edison Switchyard (NV-27-E); Hoover Dam, Arizona-Nevada Switchyard Hoover Dam, Static Towers and Lines Hoover Dam, Los Angeles Relay Control Building Hoover Dam, Switchyard Fire House (NV-27-I); Hoover Dam, Promontory Water Tank Hoover Dam, Control Cable Hoist House Hoover Dam, Transformer Circuits Hoover Dam, Los Angeles BPL Lines 1-3 Hoover Dam, Southern California Edison North and South Lines Hoover Dam, Hoover-Basic Magnesium North and South Lines Hoover Dam, Metropolitan Water District Line 1 Hoover Dam, United States Construction Railroad Hoover Dam, U.S.

Highway 93 Nevada Segment Hoover Dam, Lower Portal Access Road Hoover Dam, Kingman Switchyard Hoover Dam, U.S. Highway 93 Arizona Segment (NV-27-U); Hoover Dam, Explosives Magazines Hoover Dam, Nevada Downstream Waste Tailings and Hoover Dam, Nevada Spoils Tunnel Hoover Dam, Henderson-Mead Transmission Line 2

Source document Quoted word for word from HAER NV-27-H. Not written, edited or summarised by this site.

This documentation was prepared for three federal agencies: U.S. Department of Transportation, Federal Highway Administration (FHWA), Central Federal Lands Highway Division, Lakewood, CO; U.S. Department of Energy, Western Area Power Administration (Western), Desert Southwest Customer Support Region, Phoenix, AZ; and U.S. Department of Interior, Bureau of Reclamation (Reclamation), Lower Colorado Region, Boulder City, NV. This documentation records certain transportation and electrical features associated with Hoover Dam before planned removal or alteration of some structures. FHWA plans to construct a bridge over the Black Canyon of the Colorado River about downstream from Hoover Dam. The Hoover Dam Bypass Project would include realignment of U.S.

Highway 93 on the Nevada and Arizona sides of Black Canyon. The project would include demolition, relocation, or substantial visual impact to a segment of U.S. Highway 93 on the Nevada approach to Hoover Dam, a segment of a former alignment of U.S. Highway 93 in Arizona, electrical transformer circuits in Arizona and Nevada, two electrical switchyards, a segment of the grade of the U.S. Construction Railroad, a stone gate structure for a dam construction and operations road, and six historic transmission lines. This documentation also records certain structures not directly affected by FHWA's Hoover Dam Bypass Project. Electrical transmission facilities at Hoover Dam are administered by Western, but these facilities are within a federal reservation administered by Reclamation.

Documentation of electrical structures is intended to partially fulfill responsibilities of Western and Reclamation under Section 110 of the National Historic Preservation Act (As amended). Some electrical structures addressed by Western and Reclamation would be directly affected by FHWA's Hoover Dam Bypass Project, and all structures addressed by Western and Reclamation are functionally related and geographically near structures addressed by FHWA. Project Manager and historian for the recordation was Kurt P. Schweigert of Associated Cultural Resource Experts. The photographers were Deborah Dobson-Brown and Douglas M. Edwards of Associated Cultural Resource Experts.

This documentation was prepared on the basis of research conducted at Reclamation archives in Denver, CO, and Boulder City, NV; Western archives and files in Denver and Phoenix, AZ; the National Archives and Records Administration in Denver; libraries of the University of Nevada-Las Vegas; and the Western History Collection of the Denver Public Library. This documentation includes information contained in survey reports for the Hoover Dam Bypass Project Environmental Impact Statement, an evaluation of the Western switchyards at Hoover Dam, an evaluation of the Hoover Dam construction railroads, a National Register nomination for Hoover Dam, and other documents.