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Siuslaw River Bridge

Florence Bridge

Siuslaw River Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: September 3, 2018

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Facility Carried / Feature Intersected
Oregon Coast Highway (US-101) Over Siuslaw River
Location
Florence: Lane County, Oregon: United States
Structure Type
Metal Rivet-Connected Pratt Deck Truss, Movable: Double Leaf Bascule (Fixed Trunnion) and Approach Spans: Concrete Tied Rainbow Through Arch, Fixed
Construction Date and Builder / Engineer
1936 By Builder/Contractor: Mercer-Fraser Company of Eureka, California and Engineer/Design: Conde Balcom McCullough (Oregon State Highway Commission)
Rehabilitation Date
2018
Main Span Length
154.0 Feet (46.9 Meters)
Structure Length
1,649.4 Feet (502.7 Meters)
Roadway Width
37 Feet (11.28 Meters)
Spans
1 Main Span(s) and 22 Approach Span(s)
Inventory Number
01821E

Historic Significance Rating (HSR)
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Bridge Documentation

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

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

HAER Data Pages, PDF

View Historic Bridge Inventory Sheet For This Bridge

View National Register of Historic Places Nomination Form For This Bridge - Hi-Res Alternate of Drawings Included In Form

HAER Documentation, Oregon Coast Highway Bridges - Data Pages - Drawings

 

Of the many amazing historic bridges on the Oregon Coast Highway, this is one of the most notable bridges. This spectacular bridge is richly ornamented and consists of an unusual combination of concrete rainbow arch spans and a steel bascule span. The truly unique four bridge houses around the bascule span are works of art in their own right, as are the smaller decorative pillars at the ends of the arch spans and the ends of the entire bridge as well.

Note: A special photo gallery from ODOT with historical bridge construction photos is available. For those looking for detailed descriptions of the photos in that gallery, refer to this list of captions (the photo number corresponds to the number at the end of the photo's filename, and also note HistoricBridges.org presents the photos in the same order, sorted by date). The captions in the link here were provided by ODOT and HistoricBridges.org has NOT verified their accuracy.

Above: Portion of original bridge drawing showing how the concrete rainbow arch is reinforced by solid steel pieces (not just rebar). Details of the steel eyebars for the bottom chord (tie) are shown.

Above: Portion of original bridge drawing showing the bascule trunnion as well as the operating rack and pinion.

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Photo Galleries and Videos: Siuslaw River Bridge

 

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Bridge Photo-Documentation

Original / Full Size Photos
A collection of overview and detail photos. This gallery offers photos in the highest available resolution and file size in a touch-friendly popup viewer.
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Bridge Photo-Documentation

Mobile Optimized Photos
A collection of overview and detail photos. This gallery features data-friendly, fast-loading photos in a touch-friendly popup viewer.
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View Photo Gallery

Historical Construction Photos

Original / Full Size Photos
A large collection of historical photos showing bridge construction from Oregon Department of Transportation. This gallery offers photos in the highest available resolution and file size in a touch-friendly popup viewer.
Alternatively, Browse Without Using Viewer

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View Photo Gallery

Historical Construction Photos

Mobile Optimized Photos
A large collection of historical photos showing bridge construction from Oregon Department of Transportation. This gallery features data-friendly, fast-loading photos in a touch-friendly popup viewer.
Alternatively, Browse Without Using Viewer

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Maps and Links: Siuslaw River Bridge

Coordinates (Latitude, Longitude):

Search For Additional Bridge Listings:

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

Bridgehunter.com: View listed bridges within 10 miles (16 kilometers) of this bridge.

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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