Mowat Construction Company: Bridge Remodeling and Restoration 
- Alaska
- Washington
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Mowat Construction Company Capabilities: Bridge Remodel & Restoration
Copper River Highway, Million Dollar Bridge
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Phase: |
I, Rehabilitation and Seismic Retrofit |
| Client/Owner: | State of Alaska Department of Transportation & Public Facilities |
| Location: | Cordova, AK |
| Cost: | $16,900,000 (Total Contract Value) |
The Million Dollar Bridge was originally constructed in 1910. Located 49 miles northeast of Cordova, it spans the Copper River between the Miles Glacier and the Childs Glacier. The historic bridge’s northernmost span was shaken from its concrete pier by the 1964 Good Friday Earthquake. This rehabilitation project included constructing temporary lifting bents, raising the fallen span while supporting the adjacent span, removing and replacing the damaged members in two of the truss spans, removing the failed pier, constructing foundation piles for a new footing and pier wall, providing seismic enhancements, and replacing the damaged bridge deck and rail. An alternate foundation design was required to overcome the horrendous subsurface soils that included a boulder field. Six foot diameter open-ended piles were oscillated through the boulders. Additional bracing on the existing structure was required to withstand the windloading during jacking. Jacking bents were designed and erected to withstand loadings in excess of 600 tons vertical and 560 tons lateral (for ice impact). Work progressed through two Cordova winters with over 30 feet of snow, winds reaching 100 mph, and -20° F temperatures.