SAN JOAQUIN COUNTY – Caltrans will soon begin a bridge maintenance and preservation project that will make necessary upgrades and repairs of the Old River Bridge on State Route 4 (SR-4), located at the San Joaquin/Contra Costa County line, east of Discovery Bay.
This project is required to install a new polyester concrete overlay to the bridge deck (roadway) surface, install new guardrail systems located at the approaches of each end of the bridge, and painting of the bridge steel structure with weather-resistant paint and materials to increase the reliability and serviceability of this 100-year-old swing span bridge.
Additional in-water work will see the existing timber waling and the fenders on the north side of Pier 3 replaced, while the south side of Pier 2 would be supported with new high-density polyethylene walers mounted to the existing timber piles…