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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
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Hoover Dam, Lower Portal Access Road, U.S. Highway 93, Boulder City, Clark County, NV
Summary
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 coffer dam was constructed and diversion tunnels were bored northward on the Nevada and Arizona sides of the river.
Survey number: HAER NV-27-S
Building/structure dates: 1931 Initial Construction
National Register of Historic Places NRIS Number: 81000382
Tags
service roads
boulder city
hoover
dam
hoover dam
portal
access
portal access road
highway
boulder
clark county
nevada
historic american engineering record
inc six companies
us bureau of reclamation
photo
ultra high resolution
high resolution
arizona
mountains
mountain pass
library of congress
national register of historic places
Date
1969 - 1980
Contributors
Historic American Engineering Record, creator
Six Companies, Inc., Engineer & Builder
U.S. Bureau of Reclamation
Location
Source
Library of Congress
Link
Copyright info
No known restrictions on images made by the U.S. Government; images copied from other sources may be restricted. http://www.loc.gov/rr/print/res/114_habs.html