The Grand Coulee Bridge, or Columbia River Bridge at Grand Coulee Dam,^[3] is a through-cantilever steel truss bridge built in 1934–35. It carries State Route 155 across the Columbia River immediately below Grand Coulee Dam, near the city of Grand Coulee, Washington. It was added to the National Register of Historic Places in 1982.^[4]

Grand Coulee Bridge
Coordinates	47°57′56″N 118°58′56″W / 47.965431°N 118.982164°W / 47.965431; -118.982164
Carries	SR 155
Crosses	Columbia River
Characteristics
Design	Through cantilever truss
Material	Concrete and steel
Total length	1,089 ft (331.9 m)[1]
Longest span	565 ft (172.2 m)
History
Opened	1935
Grand Coulee Bridge
U.S. National Register of Historic Places
Location	Spans Columbia River, Coulee Dam, Washington
Built	1934 (1934)–1935 (1935)
Architect	Washington Department of Highways
MPS	Historic Bridges/Tunnels in Washington State TR
NRHP reference No.	82004267[2]
Added to NRHP	July 16, 1982
Location

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 150 feet (46 m) 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.^[4]