Santa Rosa was a Steel Electric-class ferry built in Alameda, California, for Northwestern Pacific Railroad. She started out serving Southern Pacific Railways on their Golden Gate Ferries line on San Francisco Bay.

The Steel Electric-class ferries are a class of auto/passenger ferries that became part of the Washington State Ferry System when Puget Sound Navigation Company was acquired in 1951. They were built in San Francisco Bay for service on Southern Pacific and Northwestern Pacific Railroad routes across the bay.