The Grand Coulee Bridge, or Columbia River Bridge at Grand Coulee Dam,
is a through-cantilever steel truss bridge built in 1934–35. It carries
State Route 155 across the
Columbia River
The Columbia River ( Upper Chinook: ' or '; Sahaptin: ''Nch’i-Wàna'' or ''Nchi wana''; Sinixt dialect'' '') is the largest river in the Pacific Northwest region of North America. The river rises in the Rocky Mountains of British Columbia ...
immediately below
Grand Coulee Dam
Grand Coulee Dam is a concrete gravity dam on the Columbia River in the U.S. state of Washington, built to produce hydroelectric power and provide irrigation water. Constructed between 1933 and 1942, Grand Coulee originally had two powerho ...
, near the city of
Grand Coulee, Washington. It was added to the
National Register of Historic Places
The National Register of Historic Places (NRHP) is the United States federal government's official list of districts, sites, buildings, structures and objects deemed worthy of preservation for their historical significance or "great artistic ...
in 1982.
[ .]
The bridge was built to transport heavy equipment across the Columbia River during the construction of the dam, and thereafter as a permanent highway bridge. As such, it was designed to carry a heavier load than was typical. The bridge is supported by two concrete piers, about high. During construction, one of the piers began to tilt, probably due to fine glacial material under the gravel. Additional supports were added as a temporary measure. It employed between 1,000 and 1,200 men. The piers were later taken down to bedrock using
pneumatic caissons.
See also
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List of bridges on the National Register of Historic Places in Washington (state)
References
External links
Grand Coulee Bridgeon Archiplanet
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Road bridges on the National Register of Historic Places in Washington (state)
Bridges in Grant County, Washington
Historic American Engineering Record in Washington (state)
National Register of Historic Places in Grant County, Washington
Bridges completed in 1935
1935 establishments in Washington (state)
Cantilever bridges in the United States
Steel bridges in the United States
Bridges over the Columbia River
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