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Cascade Avenue Bridge Rehabilitation

Cascade Avenue Bridge Rehabilitation

Deck replacement and seismic retrofit of a 420 m river crossing, kept open to traffic throughout.

Deck replacement and seismic retrofit of a 420 m river crossing, kept open to traffic throughout.

Broken brown concrete bridge

Client

City of Spokane

Location

Spokane, WA

Sector

Infrastructure

Status

Completed

$41M

Contract value

6,900 m² deck

Gross area

18

Months on site

310,000

Safe work hours

01 / Challenge

01 / Challenge

The bridge carries 38,000 vehicles a day and could not be closed, and in-water work was limited to a short fish window.

02 / Approach

02 / Approach

We rebuilt the deck in halves using staged traffic switches and precast deck panels.

Pier retrofits used cofferdams installed and removed within the permitted in-water window.

03 / Outcome

03 / Outcome

Traffic stayed open in both directions, and the retrofit extended the bridge’s design life by 75 years.

Low-angel photography of bridge during daytime
Brown wooden bridge over body of water
A couple of men standing next to a construction site

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