San Mateo County Bridge Repair Project (EA 3Y620)

The San Mateo County Bridge Repair Project (EA 3Y620) is a forecast project managed by Caltrans District 4 in the Bay Area/Oakland region. The scope of work involves critical bridge repairs on SR-380 and US-101 at the El Camino Real Avenue Undercrossing and the SR-380/US-101 separation in South San Francisco and San Bruno. Key technical activities include removing unsound concrete, patching deck spalls, replacing joint seals, repairing slope paving, backfilling erosion gulleys, repairing asphalt concrete approaches, placing polyester concrete deck overlays, painting bridge identification, and repairing large spalls on concrete curtain walls. These efforts are designed to prevent further deterioration and extend the overall service life of the bridges and roadway approaches. Construction is scheduled to take place from July 2026 through October 2026. All project activities and equipment staging must remain strictly within the Caltrans right of way, specifically on the freeway or bridge decks. The project is classified under NAICS code 237310 and has been granted a Notice of Exemption under PRC 21084 and 14 CCR 15301 Class 1(d), as the maintenance work is not expected to cause significant environmental impacts.