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This is an unusual bridge, with its continuous through truss design, and is dissimilar to the simple span and cantilever trusses found elsewhere in the state. The approach spans appear to have been replaced and reconfigured from the original design. The three span continuous unit is 600 feet in length with a 280 foot center span and end spans of 160 feet.
Mark Bozanich provided the following information:
The Cascade Wagon Road was the first state road designated by the Washington legislature in 1893. This bridge was built in 1930 as part of the Cascade Wagon Road, numbered Primary State Highway 17 in 1937. The highway was intended to cross Cascade Pass and Twisp Pass with a spur heading south to the unincorporated community of Stehekin. Part of this proposed route was never built. In the later 1940s, a route via Washington and Rainy Passes was surveyed that eventually became State Route 20, the North Cascades Highway. The final link was opened to traffic in September 1972.
Above: Original plan sheet from bridge.
Above: Inspection sketch that shows the connections that have a pin.
Above: Historical ca. 1940s photo of bridge.
This bridge is tagged with the following special condition(s): Unorganized Photos
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