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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

55 Hour Highway Closures on Northbound Interstate 680 in Fremont

August 8-August 11
Work will begin Friday at 10PM to Monday 5AM.

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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

#BeWorkZoneAlert

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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.

 

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: New Dates

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 25, 2025, followed by Northbound I-680 the weekend of August 8, 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 25, 2025

Full closure on SB I-680 is scheduled on the weekend of July 25, 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 25 at 10:00 PM and conclude on the following Monday July 28 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 August 8, 2025

Full closure on NB I-680 is scheduled on the weekend of August 8, 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 August 8 at 10:00 PM and conclude on the following Monday August 11 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 Media Gallery

Additional project resources including downloadable maps, image galleries, and video clips can be found on the media resources page.

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
Or follow Caltrans on social media: X | Facebook | YouTube | Instagram

Cierres de Autopistas por 55 Horas
En el I-680 a la altura del puente Mission San José (SR-238) en Fremont
Reprogramado para los fines de semana del 25 de julio y el 8 de agosto de 2025
Proyecto de rehabilitación del puente

Project location map showing the location of SR-238 and I-680 near Fremont in Alameda County.Condado de Alameda– Caltrans cerrará una dirección del Interestatal 680 (I-680) en el cruce/puente entre el I-680 y Mission San Jose (SR-238) en Fremont durante dos fines de semana para realizar obras críticas en el puente y el pavimento. Un tramo del I-680 en dirección sur cerrará el fin de semana del 25 de julio de 2025 y un tramo del I-680 en dirección norte cerrará el fin de semana del 8 de agosto de 2025.

Estos cierres de 55 horas son necesarios para completar de forma segura y eficiente las actividades clave de construcción, incluyendo la repavimentación completa de la superficie del puente y la reparación de la losa de aproximación. Esta fase de trabajo implica el uso de maquinaria pesada y la repavimentación de toda la superficie del puente. Este trabajo debe realizarse sin tráfico activo para garantizar la seguridad de los trabajadores y conductores. Concentrando estas operaciones durante los cierres de fin de semana ayudará a reducir la duración y el impacto general del proyecto.

Durante estos cierres de fin de semana, solo se cerrará un sentido de circulación a la vez en el I-680, con desvíos establecidos. Se recomienda a los conductores planificar con anterioridad y utilizar rutas alternativas.

Los trabajos nocturnos ya están en marcha para preparación de estos cierres. Además, una vez finalizadas las obras principales del puente y la superposición de losa, se continuarán realizando trabajos adicionales durante otros cierres nocturnos hasta la primavera de 2026, incluyendo el rayado del pavimento, la instalación de barreras y otros elementos de acabado. Tenga en cuenta que todos los trabajos dependen de las condiciones meteorológicas y de la programación.

Caltrans agradece al público por su paciencia y cooperación mientras continuamos mejorando la red de transporte de California.

CIERRE TOTAL DE LA AUTOPISTA I-680 EN DIRECCIÓN SUR EL FIN DE SEMANA DEL 25 DE JULIO DE 2025:

El cierre total del I-680 Sur está programado para el fin de semana del 25 de julio de 2025. El tramo del I-680 Sur permanecerá cerrado y el tráfico se desviará por la rampa de salida de Mission Blvd/SR-238 hacia la rampa de entrada del I-680. Los cierres comenzarán el viernes 25 de julio a las 10:00 PM y finalizarán el lunes 28 de julio a las 5:00 AM.

DESVÍO SB I-680: Los automovilistas que viajan hacia el sur por el I-680 deberán salir a la derecha en la rampa de salida de Mission Blvd/SR-238 y continuar derecho por la rampa de entrada a SB I-680.

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.

CIERRE TOTAL DE LA AUTOPISTA I-680 EN DIRECCIÓN NORTE EL FIN DE SEMANA DEL 8 DE AGOSTO DE 2025:

El cierre total del I-680 Norte está programado para el fin de semana del 8 de agosto de 2025. El tramo del I-680 Norte permanecerá cerrado y el tráfico se desviará por la rampa de salida de Mission Blvd/SR-238 hacia el SR-84 en dirección este. Los cierres comenzarán el viernes 8 de agosto a las 10:00 PM y finalizarán el lunes 11 de agosto a las 5:00 AM.

DESVÍO NB I-680:Los conductores que viajen en dirección norte por el I-680 deberán tomar la salida a la derecha en la rampa de salida de Mission Blvd/SR-238; girar a la izquierda hacia NB Mission Blvd/SR-238; continuar por Mission Blvd/SR-238; girar a la derecha en Niles Canyon Rd (SR-84) y continuar; girar a la derecha en la rampa de entrada a NB I680/SR-84; incorporarse y continuar por NB I-680 hacia 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.

Si tiene alguna pregunta o desea compartir una inquietud sobre el proyecto, llame a la Línea Directa del Proyecto (510) 286-0319.
Sitio web del proyecto: dot.ca.gov/680DeckRehab

Para obtener información actualizada sobre el tráfico las 24 horas, los 7 días de la semana, visite 511.org: https://x.com/511SFBay. Para obtener información en tiempo real, visite Caltrans QuickMap: http://quickmap.dot.ca.gov.
O siga a Caltrans en redes sociales: X | Facebook | YouTube | Instagram |

#AlertadeBeWorkZone

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680号州际公路 Mission San Jose（SR-238）立交桥段
为期55小时的道路封闭
重新安排在2025年7月25日与8月8日的周末进行
桥梁翻新工程

Project location map showing the location of SR-238 and I-680 near Fremont in Alameda County.阿拉米达县讯 — 加州交通运输局（Caltrans）将在两个周末封闭680号州际公路（I-680）Fremont市Mission San Jose（SR-238）立交桥段的一个方向，以进行关键的桥梁和路面施工工作。
●南向 I-680 将于 2025年7月25日周末 关闭
●北向 I-680 将于 2025年8月8日周末 关闭
这些为期55小时的封闭措施是为了安全高效地完成桥面重铺及连接板维修等关键工作。该阶段施工需使用重型设备，并对整座桥面进行翻新。为确保工人与驾车者的安全，必须在无交通状态下进行这些操作。
将这些繁重的工作集中在周末进行，有助于减少工程的整体时间和对通勤者的影响。

在这些周末封闭期间，每次仅关闭一个方向，并会设置明确的绕行路线。建议驾驶者提前规划行程并选择替代路线。

Caltrans第四区官网

目前已开展夜间准备工作。主要桥梁与铺装完成后，其余工作（包括道路标线、防撞护栏安装及收尾工作）将持续至2026年春季，每晚进行。所有施工均取决于天气与调度。
Caltrans感谢公众的理解与配合，我们将继续致力于提升加州交通基础设施。

南向 I-680 全封闭 — 2025年7月25日周末

  • 封闭时间：7月25日（周五）晚10点起至7月28日（周一）早5点
  • 关闭段落：南向 I-680 部分路段
  • 绕行路线：请从 Mission Blvd/SR-238 出口驶出，并直行进入南向 I-680 的入口匝道。

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.

北向 I-680 全封闭 — 2025年8月8日周末

  • 封闭时间：8月8日（周五）晚10点起至8月11日（周一）早5点
  • 关闭段落：北向 I-680 部分路段
  • 绕行路线：
  • 驶出 Mission Blvd/SR-238 出口
  • 左转进入 Mission Blvd/SR-238 北向
  • 沿 Mission Blvd 行驶
  • 右转进入 Niles Canyon Rd (SR-84)
  • 再右转进入 I-680/SR-84 北向匝道，驶向 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.

📞 项目问题或反馈请致电项目热线： (510) 286-0319
🌐 项目网站： dot.ca.gov/680DeckRehab
📍 实时交通更新：
511.org | Caltrans QuickMap
📱 关注 Caltrans 社交媒体：
| X | Facebook | YouTube | Instagram |
#BeWorkZoneAlert