Donner Summit Bridge Rehabilitation

Donner Bridge construction and rehabilitation involved the restoration and seismic upgrade of a historic cast-in-place arch bridge and the installation of 50-ton rock anchors into bedrock at each abutment.

To ensure the stability of the superstructure during construction, shoring was constructed from the canyon floor approximately ninety feet below, consisting of four 100 KIP per leg towers. This temporary support of the bridge was required to replace each column, one bent at a time. Reinforcement and seismic stabilization of all four arch bases was performed in addition to the conversion of column connections from moment resisting to pinned connection.

Hydro blasting of the main bridge deck was performed to remove deteriorated concrete and salvage the existing rebar. The bridge deck was widened to accommodate upgraded barrier rails. Extensive dental concrete repair involved hand chipping of deteriorated concrete and replacing it with reinforced shotcrete.

This project was completed on time even though the removal of twenty feet of snow was required during June of the second construction year to gain access to the site located at an elevation of 7,000 feet.

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