Caltrans will perform two consecutive nights of 8-hour full highway closures for the safety of workers and motorists for testing operations of the State Route 4 Old River Bridge, located at the San Joaquin/Contra Costa County line, east of Discovery Bay. This testing is required as completion nears for the on-going bridge preventative maintenance and rehabilitation project that will make necessary upgrades and repairs of the Old River Bridge,
Overnight closures will occur beginning at 8:00 p.m. on Monday, March 25, until 4:00 a.m. on Tuesday, March 26, and from 8:00 p.m. on Tuesday, March 26, until 4:00 a.m. on Wednesday, March 27, 2024. During these closures, the following detour will be required;
State Route 4 Detour Information:
- Westbound SR-4 travelers: The detour begins at the Tracy Boulevard intersection; south on Tracy Blvd; west on I-205; north on Mountain House Parkway; northwest on Byron Road to SR-4.
- Eastbound SR-4 travelers: The detour begins at the Byron Road intersection; southeast on Byron Road; south on Mountain House Parkway; east on I-205; north on Tracy Blvd to SR-4.
Caltrans will utilize flaggers, as well as overhead and portable changeable message signs, alerting motorists of the detour and potential delays which are expected to be approximately 30 minutes.
One-way traffic control will also be required at the SR-4 Old River Bridge beginning Monday, March 18, through Friday, March 22, from 7:00 a.m. until 3:30 p.m. and on Wednesday, March 27, through Friday, March 29, 2024, from 9:00 p.m. until 4:00 a.m.
This project is required to upgrade existing mechanical and electrical components and to implement structural repairs to increase the reliability and serviceability of this 100-year-old swing span bridge.
Work will include repairing or replacing equipment that operates the movable portion of the bridge, replacing the electrical power supply to the bridge by installing a new cable in the river bottom, and adding a new control board and associated equipment to the control house above the traveled way of SR-4 on the bridge structure.
For more information on this project, please visit State Route 4 Old River Bridge Maintenance
Schedules are subject to change due to traffic incidents, weather, availability of equipment and/or materials and construction related issues. For real-time traffic conditions and highway closure information, please visit www.quickmap.dot.ca.gov. For the safety of workers and other motorists, please Be Work Zone Alert.
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