Approximate location — plotted from published sources, not a site visit, and not a guarantee of access.
Tiny historic Carquinez Strait waterfront town that boomed in the late 19th century as a grain-shipping and rail transfer port opposite Benicia. Brick warehouses, a compact Main Street, and waterfront remnants recall the era when Port Costa handled bulk wheat for export. Walkable public streets and shoreline views; a classic Bay Area industrial-heritage oddity distinct from Black Diamond Mines / Somersville and Point Richmond Historic District.