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Marblemount Bridge

Cascade River Road Bridge

Marblemount Bridge

Primary Photographer(s): Craig Holstine

Bridge Documented: March 26, 2014

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Facility Carried / Feature Intersected
Cascade River Road Over Skagit River
Location
Marblemount: Skagit County, Washington: United States
Structure Type
Metal 14 Panel Rivet-Connected Warren Through Truss, Fixed and Approach Spans: Concrete Stringer (Multi-Beam), Fixed
Construction Date and Builder / Engineer
1930 By Builder/Contractor: Alexander and McNeil of Mt. Vernon, Washington and Engineer/Design: Washington Department of Highways
Rehabilitation Date
Not Available or Not Applicable
Main Span Length
280.0 Feet (85.3 Meters)
Structure Length
662.0 Feet (201.8 Meters)
Roadway Width
20 Feet (6.1 Meters)
Spans
3 Main Span(s) and 2 Approach Span(s)
Inventory Number
82288000000000

Historic Significance Rating (HSR)
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Bridge Documentation

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.

View Archived National Bridge Inventory Report - Has Additional Details and Evaluation

View Historic Bridge Inventory Sheet For This Bridge

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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Photo Galleries and Videos: Marblemount Bridge

 

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Unorganized Photos

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A collection of overview and detail photos, presented as an unorganized and unlabeled collage and gallery. This gallery features data-friendly, fast-loading photos in a touch-friendly popup viewer.
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Maps and Links: Marblemount Bridge

Coordinates (Latitude, Longitude):

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Bridgehunter.com: View listed bridges within 0.5 miles (0.8 kilometers) of this bridge.

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HistoricBridges.org Bridge Browser: View listed bridges within 0.5 miles (0.8 kilometers) of this bridge.

HistoricBridges.org Bridge Browser: View listed bridges within 10 miles (16 kilometers) of this bridge.

2021 National Bridge Inventory: View listed bridges within 0.5 miles (0.8 kilometers) of this bridge.

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