Dumbarton Bridge to Close on Labor Day Weekend

The San Mateo Bridge is one of the suggested detour routes.

The Dumbarton Bridge will be closed in both directions over Labor Day weekend as part of the Dumbarton Bridge Seismic Safety Project, according to 511.org.

The bridge portion of state Highway 84 will be closed between the University Avenue/Bayfront Expressway interchange in Menlo Park and the Thornton Avenue/Paseo Padre Parkway interchange in Newark from 10 p.m. Friday, Aug. 31 until 5 a.m. Tuesday, Sept. 4.

During the closure, crews will elevate the bridge and install a state-of-the-art seismic joint at Pier 31.

All motor vehicle, pedestrian, and bicycle traffic will be prohibited from the bridge during this operation.

Upon reopening, traffic will not experience any alignment changes. The San Mateo Bridge and its connections with US 101 and I-880 remain open to motorized traffic, though motorists are advised to allow extra travel time.

How You Can Plan Ahead

Drivers should expect potential delays in the vicinity of the Dumbarton Bridge over Labor Day weekend. It is recommended that you allow extra time for travel, use public transit where possible, telecommute, or form a carpool. For those who must drive, use recommended detour routes.

What to Expect When the Dumbarton Bridge Reopens

Drivers, bicyclists, and pedestrians will not experience any differences on the bridge after it reopens. As the Seismic Safety Project continues beyond Labor Day weekend, there will be ongoing overnight lane closures on the bridge.

Detour Routes

To detour around the Dumbarton Bridge, use alternate bay bridges or use routes through the San Jose area. I-880, Hwy 101, Hwy 237, Hwy 92, the San Mateo Bridge, and the Bay Bridge will remain open during the closure.  However, motorists should allow extra travel time and expect potential delays.

Dumbarton Bridge Detour Routes and Maps

North Detour
Traffic should use Hwy 92 / the San Mateo Bridge as an alternate connector between the East Bay and the Peninsula. From Menlo Park, eastbound traffic should take Hwy 101 north and then Hwy 92 east over the San Mateo Bridge. From Newark and Fremont, westbound traffic should take I-880 north to Hwy 92 west over the San Mateo Bridge. See the map below for more details.

South Detour
Traffic can use Hwy 237 through the South Bay as an alternate connector between I-880 and Hwy 101. From Menlo Park, eastbound traffic should take Hwy 101 south and then Hwy 237 east toward Milpitas. From Newark and Fremont, westbound traffic should take I-880 south and then Hwy 237 west toward Sunnyvale. See the map below for more details.

Potential Bottlenecks

Avoid traffic jams. We expect potential delays at the Hwy 92/101 junction in Foster City and at the Hwy 92/880 junction in Hayward. The San Mateo Bridge, Hwy 237, and the portions of I-880 and Hwy 101 that connect these two routes will also be potentially affected by heavier-than-usual traffic. Even the Bay Bridge may be affected.

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