California Department of Transportation
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Highway 101 San Antonio River Bridge Retrofit

Project Location

The Bridge Structures that span the San Antonio River are at postmile R6.7, one mile south of Bradley.

Project Description

The project will strengthen the bridges to better withstand a future seismic event.

Scope of Work

The scope of work will include the retrofit of:

  • the hinges with pipe seat extenders and cable restrainers;
  • the top and bottom of each pier with steel plates and threaded rods;
  • the abutments, wing walls, and barrier railings:
  • the slope paving, and rock slope protection.

Work will also include revegetation of areas disturbed by construction.

Permits and Approvals Required

Approval Agency
Project Funding California Transportation Commission
Section 1602 Agreement    California Department of Fish & Wildlife
Section 401 Certification     Central Coast Regional Water Quality Control Board
Section 404 Permit (Nationwide)    U.S. Army Corps of Engineers
Biological Opinion   U.S. Fish & Wildlife Service
Biological Opinion  National Marine Fisheries Service


Environmental Approval Fall 2018
Project Final Design Spring 2020
Construction      Winter 2021- Summer 2022


Public Notice - May 18, 2018

Initial Study with Proposed Mitigated Negative Declaration






Last updated: May 21, 2018