Inside a former World War II shipyard warehouse on the Sausalito shoreline sits a massive, working model of the entire San Francisco Bay. This is the Bay Model Visitor Center, an educational facility run by the U.S. Army Corps of Engineers. The building itself is part of the historic Marinship yard, and its vast, open interior – roughly the size of two football fields – is needed to contain the 1.5-acre hydraulic model at its center. It’s a hand-sculpted, three-dimensional map of the bay and the Sacramento-San Joaquin River Delta system, complete with every river, inlet, and island.
Originally built in the 1950s, the model was a scientific tool used to study the real-world effects of potential dams, dredging, or other engineering projects on the bay's complex ecosystem. It was used for research until 2000, when its purpose shifted entirely to public education. Today, you can watch it simulate a full tidal cycle, a process that takes under 15 minutes and clearly demonstrates the intricate flow of currents and water throughout the region. The simulation runs continuously throughout the day.
Beyond the model, the space includes a small museum area with displays on the shipyard’s wartime history, local marine life, and water conservation. Knowledgeable staff and docents are usually on hand to explain the fluid dynamics or answer more in-depth questions about the bay’s history and hydrology. Ample parking is available on-site, and admission is free.
Bay Model Visitor Center
