The Dumbarton Bridge is the southernmost of the highway bridges across San Francisco Bay in California. Carrying over 81,000 vehicles daily, it is the shortest bridge across San Francisco Bay at . Its east end is in Fremont, near Newark in the San Francisco Bay National Wildlife Refuge, and its west end is in Menlo Park. Bridging State Route 84 across the bay, it has three lanes each way and a separated bike/pedestrian lane along its south side. Like the San Mateo Bridge to the north, power lines parallel the bridge.