Bay Farm Island Bridge is located in the City of Alameda, which is located in Alameda County California. It spans the inlet to the San Leandro Bay from the San Francisco Bay. See Map
The Alameda County Department of Public Works provides preventive maintenance to the bridge. Large scale repairs are done by Cal Trans.
Vertical Clearance MLLW (Low Tide) 26'
Over 40,000 vehicles cross Bay Farm Island Bridge every day. To stop all these vehicles and pedestrians requires the use of 4 traffic gates, one vehicle barrier, and 2 pedestrian gates. The bridge operator also must stay in contact with the City of Alameda Fire and Police Dispatcher in case any vehicle is in route to a emergency or hospital. The bridge will not open in this instance.
The bridge has some unique characteristics. Instead of having the machinery room and operator tower close to or on the shore like the other bridges its has a huge concrete cofferdam in the channel that's contains the machinery rooms. counterweight, and operator tower. The bridge has three live load trunions instead of the two you normally see on a bascule type bridge. It also has dual machinery rooms that work in tandem. The bridge is powered by two 50 HP electric motors. The bridge contains four sets of brakes two main brakes and two backup brakes. The Counterweight pit area is 50 Feet below the roadway surface. If your standing on the pit floor youre approximately 25 feet under water.
Bay Farm Island Bridge also contains the operating console for the Bay farm Island Bike Bridge so the operator must run two bridge for each vessel opening.