I-8 Surface Pavement and Seismic Bearing Replacement Improvement Project on the Colorado River Viaduct Bridge

This map shows the project limits. For more information, call (619) 688-6670 or email CT.Public.Information.D11@dot.ca.gov


This project will extend the service life of the Colorado River viaduct bridge by adding a protective polymer coating to the surface, thus increasing the life expectancy of the bridge. Removing unsound concrete, replacing approach slabs, replacing defective guardrail, and replacing seismic bearings that help absorb earthquake sway making the bridge more stable in the event of an earthquake. Most of the work will be done at night. 

Extending the Service Life

Construction crews will begin on the California side by replacing the approach slabs at the beginning of the bridge. This will ensure a smoother transition while reducing maintenance costs for dips that might occur. The project will also lay a protective polymer layer on the deck surface which will help seal the bridge deck and reduce weather effects. 

Improving the deck with PPC and New Seismic Bearing Pads

The project will utilize Polyester Polymer Concrete (PPC). The overlay material is designed to protect bridge decks and reduce long-term maintenance costs, reducing impacts on the traveling public and exposure for highway workers. Seismic bearing pads are a kind of bridge bearing designed to minimize forces and displacements during an earthquake.


Construction is expected to begin February 2023 and completed by September 2023. Preliminary signage will be posted informing motorists when the closures will begin.


The 8-million-dollar project is a joint venture with the state of Arizona. Arizona will provide 4 million dollars, while the rest will come from federal funds.

What’s Ahead

The average traffic volume within the project limits is approximately 3,400 vehicles per day. This segment of I-8 will be reduced to one lane during the construction for extended periods. Construction will occur behind concrete barriers to expedite construction and protect construction crews, with expected delays to minimize the impact of the daily commute, consecutive lanes will not be closed simultaneously. Caltrans will reach out to residents, local tribal communities, businesses, schools, and community groups in the region.


Safety for the traveling public, including safety and protection for highway workers, is priority number one for Caltrans.