Overview

We completed seismic retrofits that strengthened six bridges on I-90 between East Sunset Way/Highlands Drive Northeast in Issaquah and 436th Avenue Southeast in North Bend. Our contractor crews added steel “jackets” around columns that hold up the bridges that will help keep the columns from buckling in an earthquake. They also added supports to some cross beams that will keep girders from moving during an earthquake.

How you benefit

Improved safety: Ensuring that the bridges are seismically retrofitted reduces the risk of the overpasses cracking or collapsing during an earthquake.

Preservation: Strengthening the columns and beams helps reduce potential damage to the bridges in the event of an earthquake.

Economic: Seismically retrofitting the bridges helps reduce the risk that travelers and commerce will be disrupted after an earthquake.

Funding

This $4.2 million project was paid for with state and federal funding.