Hoover Dam, Nevada Downstream Waste Tailings, Near the Lower Portal Tunnel Access Road, Boulder City, Clark County, NV

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 lower-level access to the Hoover Dam power plant, and for other dam-related facilities.

Survey number: HAER NV-27-W

Building/structure dates: after. 1930- before. 1937 Initial Construction

National Register of Historic Places NRIS Number: 81000382

dams boulder city hoover dam hoover dam nevada tailings waste tailings portal tunnel access portal tunnel access road boulder clark county historic american engineering record inc six companies us bureau of reclamation photo ultra high resolution high resolution power plants mountains mountain pass library of congress national register of historic places colorado river

1969 - 1980

Library of Congress

http://www.loc.gov/

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