Coast Guard Island is owned by the federal government and is not open to the general public; escorts or specific government identification cards are required for visitors.
October 23, 2025
high
operational
Access to the federal Coast Guard base on Coast Guard Island is restricted and controlled.
Coast Guard Island is an artificial island located in the Oakland Estuary between the cities of Oakland and Alameda in California.
October 23, 2025
high
geographic
Geographic description of the location known as Coast Guard Island (Coast Guard Station Alameda).
A 2016 U.S. Coast Guard document states that Coast Guard Island is federally owned and restricts visits by the general public without an escort or specific government identification.
January 01, 2016
high
temporal
Access and ownership restrictions as described in an official Coast Guard document.
In February 2012 the U.S. Coast Guard established Base Alameda on Coast Guard Island by consolidating several existing Coast Guard operations into a single base.
February 01, 2012
high
temporal
Organizational history regarding the establishment of the current Coast Guard base on the island.
The U.S. Coast Guard established a base on Coast Guard Island in 1926.
January 01, 1926
high
historical
The U.S. Coast Guard has maintained facilities on Coast Guard Island since the early 20th century.
Coast Guard Island is an artificial island that was formed in 1913.
January 01, 1913
high
historical
Coast Guard Island is a man-made island in Alameda, California.
Coast Guard Island is a 67-acre human-made island formed in 1913 in the Oakland Estuary between the cities of Oakland and Alameda, California.
January 01, 1913
high
temporal
Geographic and historical description of the island that hosts a Coast Guard base.