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US-101 Hamma Hamma River Bridge South

US-101 Hamma Hamma River Bridge South

Primary Photographer(s): Nathan Holth

Bridge Documented: August 24, 2014

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Key Facts

Facility Carried / Feature Intersected
US-101 (Pacific Coast Scenic Byway) Over South Hamma Hamma River
Location
Rural: Mason County, Washington: United States
Construction Date and Builder / Engineer
1924 By Builder/Contractor: Colonial Building Company of Spokane, Washington and Engineer/Design: Washington Department of Highways

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
150 Feet (45.72 Meters)
Structure Length
154 Feet (46.94 Meters)
Roadway Width
20 Feet (6.1 Meters)
Spans
1 Main Span(s)
NBI Number
0000734B0000000

Historic Significance Rating (HSR)

Bridge Documentation

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

View Historic American Engineering Record (HAER) Documentation For This Bridge

View Historic Structure Reports For This Bridge

HAER Data Pages, PDF

This is one of two nearly identical bridges that cross the north and south Hamma Hamma River and are within sight of each other. The bridges are rare examples of concrete through arch bridges (often called rainbow arch bridges). These two bridges are particularly rare because they function as three hinged arch bridges, which is uncommon among rainbow arch bridges. The bridges include overhead struts. The end struts (portal bracing) have been removed to increase portal bracing. It is unknown what the details of these end struts were, but they were larger and therefore different than the other struts.

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