Alameda Island is an island in the
San Francisco Bay in
California. It is south and west of, and adjacent to
Oakland, and across the bay eastward from
San Francisco. Located on the island is most of the city of
Alameda, a city in
Alameda County. The population was 73,812 as of 2010. Also located on the island is the
Naval Air Station Alameda, a defunct
naval air station, as well as a small uninhabited part of
San Francisco. The island was originally a peninsula and a part of Oakland, and is now separated from the mainland by the
Oakland Estuary. The island is connected to the mainland by four bridges: the
Park Street Bridge,
Fruitvale Bridge,
High Street Bridge, and Bay Farm Island Bridge. The
Posey and Webster Street tubes also connect Oakland to Alameda Island.