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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, C ...
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 powerhous ...
, near the city of
Grand Coulee, Washington Grand Coulee is a city in Grant County, Washington, Grant County, Washington (state), Washington, United States. The population was 972 at the 2020 United States census, 2020 census. History Grand Coulee was officially incorporated on November 6 ...
. 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 v ...
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

*
List of bridges documented by the Historic American Engineering Record in Washington (state) __NOTOC__ This is a list of bridges documented by the Historic American Engineering Record in the US state of Washington (state), Washington. Bridges See also *List of tunnels documented by the Historic American Engineering Record in Washington ...
*
List of bridges on the National Register of Historic Places in Washington (state) This is a list of bridges and tunnels on the National Register of Historic Places in the U.S. state of Washington (state), Washington. See also *List of bridges documented by the Historic American Engineering Record in Washington (state) *List ...


References


External links


Grand Coulee Bridge
on Archiplanet * * 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 {{Washington-bridge-struct-stub