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Interstate 680 and State Route 238 Separation Bridge Rehabilitation Project

Banner image for the I-680 Mission San Jose (I-680/SR-238) Separation Bridge Rehabilitation Project

Mission San Jose (680/238) Separation on Northbound and Southbound I-680 in Fremont

Caltrans began work on the I-680 Mission San Jose (680/238) Separation Bridge Deck Rehabilitation Project on northbound and southbound I-680 at Mission San Jose (680/238) Separation in Fremont, in April, 2025, with an estimated completion in Winter 2025. The project will improve safety and extend the life of the bridge by resurfacing the bridge deck, repair bridge approach slabs and replace the concrete barrier.

During construction work times, drivers should expect lane closures, shifting traffic patterns, and possible delays. Work is weather and schedule permitting.

Current Work Schedule

Intermittent nightly closures
Monday to Friday: 8:00 PM – 5:00 AM

During these hours, motorist should expect ramp and lanes to be closed to traffic. Motorists should plan and use alternate routes. Caltrans thanks the public for their patience and cooperation as we continue to improve California's transportation network.

Upcoming Closures

Caltrans is scheduled to close one direction of Interstate 680 at the I-680 and Mission San Jose (SR-238) Separation/Overpass in Fremont for two consecutive weekends to perform critical bridge and pavement work. Southbound I-680 will close the weekend of July 11, 2025, followed by Northbound I-680 the weekend of July 18, 2025.

These 55-hour closures are necessary to safely and efficiently complete key construction activities, including full bridge deck resurfacing and approach slab repairs. This phase of work involves heavy machinery and the resurfacing of the entire bridge deck. This work must be performed without live traffic to ensure worker and motorists safety. Concentrating these operations during weekend closures helps reduce the overall duration and impact of the project.

During these weekend closures, only one direction of travel on I-680 will be closed at a time with detours set in place. Motorists are encouraged to plan ahead and use alternative routes.

Construction is already underway in preparation for these closures. After the major bridge and overlay work is completed, additional work will continue during nighttime closures through Spring 2026, including pavement striping, barrier installation, and other finishing elements. Please note all work is weather dependent and scheduling dependent.

Caltrans thanks the public for their patience and cooperation as we continue to improve California's transportation network

Southbound I-680 Full Highway Closure on the Weekend of July 11, 2025

Full closure on SB I-680 is scheduled on the weekend of July 11, 2025. A segment of SB I-680 will be closed and traffic will be detoured through the Mission Blvd/SR-238 Off Ramp towards the I-680 On Ramp.  Closures will start Friday July 11 at 10:00 PM and conclude on the following Monday July 14 at 5:00 AM.

Southbound I-680 Detour

Motorists traveling southbound on I-680 will need to exit right onto Mission Blvd/SR-238 Off Ramp and continue straight onto SB I-680 On-Ramp. 

Detour map for closure of southbound I-680. Motorists traveling southbound on I-680 will need to exit right onto Mission Blvd/SR-238 Off Ramp and continue straight onto SB I-680 On-Ramp.

Northbound I-680 Full Highway Closure on the Weekend of July 18, 2025

Full closure on NB I-680 is scheduled on the weekend of July 18, 2025. A segment of NB I-680 will be closed and traffic will be detoured through the Mission Blvd/SR-238 Off Ramp towards Eastbound SR-84.  Closures will start Friday July 18 at 10:00 PM and conclude on the following Monday July 21 at 5:00 AM.

Northbound I-680 Detour

Motorists traveling northbound on I-680 will need to exit right onto Mission Blvd/SR-238 Off-Ramp; Left towards NB Mission Blvd/SR-238; Continue on Mission Blvd/SR-238; Make a right onto Niles Canyon Rd (SR-84) and continue; Right onto NB I-680/SR-84 On-Ramp; Merge and continue onto NB I-680 towards Sacramento.

Detour map for closure of northbound I-680. Motorists traveling northbound on I-680 will need to exit right onto Mission Blvd/SR-238 Off-Ramp; Left towards NB Mission Blvd/SR-238; Continue on Mission Blvd/SR-238; Make a right onto Niles Canyon Rd (SR-84) and continue; Right onto NB I-680/SR-84 On-Ramp; Merge and continue onto NB I-680 towards Sacramento.

Project Contacts

If you have a question or want to share a concern about the project, please call the Project Hotline (510) 286-0319

For 24/7 traffic updates, please visit 511.org: https://x.com/511SFBay
For real-time information, please visit Caltrans QuickMap: http://quickmap.dot.ca.gov
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