BridgeSeek

Historic Bridges: I-5

Special Bridge Conditions Legend: R - Former location of relocated bridge. ! - At risk for demolition or destruction. X - Confirmed demolished or collapsed. S - Dismantled and/or in storage. L - Severe loss of historic integrity due to alteration.

Results in this list will be limited to the first 200 results. Consider performing a more narrow search from the main BridgeSeek tool if your search here is showing 200 results.

Total Bridges Found: 4

I-5 Skagit River Bridge
HSR

I-5 Over Skagit River in Mt. Vernon: Skagit County, Washington, United States

Metal 6 Panel Rivet-Connected Warren Through Truss, Fixed and Approach Spans: Concrete Curved T-Beam, Fixed

Length: 1,112 ft. Main Span: 160 ft. Roadway: 56 ft. Main Spans: 4

Built 1955 By: Peter Kiewit and Sons of Omaha, Nebraska

Although structurally noted for a design that looked continuous but is actually simple spans, this bridge was made infamous when a truck crashed into and collapsed one of the spans.

!
Interstate Bridge
HSR

I-5 Over Columbia River in Portland and Vancouver: Multnomah County, Oregon and Clark County, Washington, United States

Metal 11 Panel Rivet-Connected Parker Through Truss, Movable: Vertical Lift (Span Drive) and Approach Spans: Metal 22 Panel Rivet-Connected Pennsylvania Through Truss, Fixed

Length: 3,538 ft. Main Span: 531 ft. Roadway: 38 ft. Main Spans: 1

Built 1917 By: American Bridge Company of New York, New York and Waddell and Harrington of Kansas City, Missouri

A bridge with complex history, this bridge is paired with a nearly identical 1958 bridge, and its 278.7 foot vertical lift span from 1917 today is out-spanned by a newer 1958 fixed truss span of 531.4 feet.

Marquam Bridge
HSR

I-5 Over Willamette River in Portland: Multnomah County, Oregon, United States

Metal Cantilever 14 Panel Multiple-Type-Connected Warren Deck Truss, Fixed and Approach Spans: Metal Stringer (Multi-Beam), Fixed

Length: 5,280 ft. Main Span: 440 ft. Roadway: 114 ft. Main Spans: 3

Built 1966 By: American Bridge Company of New York, New York and Ivan D. Merchant

This utilitarian mid-20th century truss bridge is noted for its unusual double-deck cantilever truss design.

Winchester I-5 Bridges
HSR

I-5 Over North Umpqua River in Winchester: Douglas County, Oregon, United States

Metal 8 Panel Rivet-Connected Warren Deck Truss, Fixed and Approach Spans: Concrete T-Beam, Fixed

Length: 1,637 ft. Main Span: 140 ft. Roadway: 28 ft. Main Spans: 5

Built 1955 By: Unknown and P. Mervyn Stephenson and Theodore C. Roake

This pair of nearly identical bridges are a good example of mid 20th century riveted truss bridge construction.

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