1 vote

Cascade River Road Bridge


Photo From WSDOT


BH Photo #295232


Street View 


Through truss bridge over Skagit River on Cascade River Road in Marblemount
Skagit County, Washington
Open to traffic
Built 1930
Continuous Warren through truss
Length of largest span: 279.9 ft.
Total length: 662.1 ft.
Deck width: 20.0 ft.
Vertical clearance above deck: 17.8 ft.
Approximate latitude, longitude
+48.52667, -121.43000   (decimal degrees)
48°31'36" N, 121°25'48" W   (degrees°minutes'seconds")
Approximate UTM coordinates
10/615916/5376029 (zone/easting/northing)
Quadrangle map:
Average daily traffic (as of 2017)
Inventory number
BH 34479 (Bridgehunter.com ID)
Inspection report (as of March 2018)
Overall condition: Fair
Superstructure condition rating: Satisfactory (6 out of 9)
Substructure condition rating: Good (7 out of 9)
Deck condition rating: Satisfactory (6 out of 9)
Sufficiency rating: 55.9 (out of 100)
View more at BridgeReports.com

Update Log 

  • September 22, 2014: New photo from Nathan Holth



Cascade River Road Bridge
Posted February 13, 2019, by Mark Bozanich (markthemapper [at] gmail [dot] com)

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.

The enclosed WSDOT photograph was taken in the early 1940s. Note the Washington State Highway 17 sign at the beginning of the bridge. The bracing above the roadway has since been modified so that the vertical clearance is the same the whole width of the roadway.

Attachment #1 (application/pdf; 1,381,764 bytes)