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  5. 55 hr. Full Highway Closure On Northbound I-680 at the Mission San Jose (SR-238) Overpass in Fremont Starting Friday Night, August 8 to Monday Morning, August 11

55 hr. Full Highway Closure On Northbound I-680 at the Mission San Jose (SR-238) Overpass in Fremont Starting Friday Night, August 8 to Monday Morning, August 11

Published:

Bridge Rehabilitation Project

Alameda County – Caltrans has scheduled work on northbound Interstate 680 (I-680) at the Mission San Jose (SR-238) Separation/Overpass in Fremont the weekend of August 8, 2025.

On Friday, August 8, lane reductions are scheduled to begin at 8:00 PM with the full closure and work scheduled to begin at 10:00 PM and be completed by Monday, August 11 at 5:00 AM. This closure is necessary to perform critical bridge and pavement repairs.

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.

Map of 55-hour full highway closure on Northbound I-680 at the Mission San Jose (SR-238) overpass in Fremont, with additional detour maps embedded into large map.

To help minimize congestion during this weekend’s 55-hour closure, Caltrans is implementing additional ramp closures, on-ramp restrictions, and left-turn limitations. These changes are intended to guide more drivers toward I-880 and other regional detour options, reducing pressure on local roads and improving overall traffic movement. Please see the details below to plan your travel.

Detour map of 55-hour full highway closure on Northbound Interstate 680. I-680 Southbound to Mission Boulevard Exit 16 is Closed. I-680 Northbound closed at Mission Blvd. Re-route to Interstate 880 is the best option.

Detour map of 55-hour full highway closure on Northbound Interstate 680. I-680 Northbound On-ramps from Mission Boulevard is Closed. I-680 Northbound to Mission Blvd Exit East is Closed. Re-route to Interstate 880 is the best option.

Detour map of 55-hour full highway closure on Northbound Interstate 680. I-680 Northbound On-ramps from Auto Mall Parkway is Closed. I-680 Northbound to Durham Exit East is Closed. Re-route to Interstate 880 is the best option.

Detour map of 55-hour full highway closure on Northbound Interstate 680. I-680 Northbound to Washington Blvd Exit is Closed. I-680 Northbound On-ramp is Closed. Re-route to Interstate 880 is the best option.

Detour map of 55-hour full highway closure on Northbound Interstate 680. No Left Turn from Mission Blvd. to Northbound Niles Canyon Road. Old Canyon Road and Niles Blvd. is Closed. Re-route to Interstate 880 is the best option.

Detour map of 55-hour full highway closure on Northbound Interstate 680. Highway 84 Northbound off-ramp to Sunol is Closed. Make left turn at Main St. to enter Sunol. Re-route to Interstate 880 is the best option.

 

Northbound Local Detour Map for 55 hr. Full Highway Closure On Southbound I-680 at the Mission San Jose (SR-238) Overpass in Fremont.

NB Local 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.

If you have a question or want to share a concern about the project, please call the

Project Hotline: (510) 286-0319

Project Website: Interstate 680 and State Route 238 Separation Bridge Rehabilitation Project | Caltrans

Media Resource Page: I-680 and SR-238 Separation Bridge Rehabilitation Project Media Resources | Caltrans

For 24/7 traffic updates, please visit 511.org: https://x.com/511SFBay
For real-time information, visit Caltrans QuickMap: https://quickmap.dot.ca.gov
Follow us on X: https://x.com/CaltransD4
Or call 1-800-472-7623, 1-800-427-ROAD for state highway conditions statewide.

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QR Code link to Interstate 680 and State Route 238 Separation Bridge Rehabilitation Project page. URL: https://dot.ca.gov/caltrans-near-me/district-4/d4-projects/d4-680-238-bridge-rehabilitation

Northbound Regional Detour

Northbound Regional Detour Map for 55 hr. Full Highway Closure On Southbound I-680 at the Mission San Jose (SR-238) Overpass in Fremont.

 

Northbound Local Detour

Northbound Local Detour Map for 55 hr. Full Highway Closure On Southbound I-680 at the Mission San Jose (SR-238) Overpass in Fremont.