First Ship Into San Francisco Bay
On August 5 1775, the Spanish packet San Carlos, under the command of Lieutenant Juan Manuel de Ayala, became the first ship to enter
San Francisco Bay. A month and a half was spent in surveying the bay from its southernmost reaches to the northern end of present-day
Suisun Bay. The San Carlos departed September 18, 1775.
California Registered Historical Landmark No. 236
Plaque placed by the State Department of Parks and Recreation in
cooperation with the San Francisco Twin Bicentennial, Inc., August 5, 1975.