Grand Coulee Bridge, Steel cantilever bridge across Columbia River in Okanogan County, US.
The Grand Coulee Bridge extends 1,089 feet across the Columbia River, featuring metal trusses supported by two concrete piers rising 150 feet high.
In 1934, construction teams employed over 1,000 workers to build this bridge, which became essential for transporting equipment during Grand Coulee Dam construction.
The bridge received recognition on the National Register of Historic Places in 1982 for its engineering significance and role in regional development.
State Route 155 crosses this bridge, connecting Douglas and Okanogan counties while supporting regional traffic and transportation needs throughout Washington State.
Engineers stabilized the bridge's tilting pier during construction by drilling down to bedrock using pneumatic caissons, ensuring long-term structural integrity.
Location: Okanogan County
Location: Douglas County
Official opening: 1935
Length: 325 m
GPS coordinates: 47.96540,-118.98200
Latest update: March 9, 2025 00:59
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