Bay Model Visitor Center
Museum · 2100 Bridgeway, Sausalito, CA 94965
Verified September 2026
Photo by Cary Bass-Deschenes, CC BY-SA 2.0, via Wikimedia Commons
The Bay Model is a working hydraulic scale model of San Francisco Bay and the Sacramento-San Joaquin Delta, built by the Army Corps of Engineers to study tides and currents across 1.5 acres of warehouse floor. The Corps surveyed the whole Bay Area and built it in 1956 and 1957, at a horizontal scale of 1:1,000 and a vertical scale of 1:100. It's free, it's indoors, and it's one of the few things in Sausalito a rainy day doesn't ruin. The Corps still calls it the only one of its kind in the world.
What To Expect
You walk out onto a raised gangway above the model itself, which reproduces the entire Bay and Delta system at a scale where a full tidal cycle plays out in about 15 minutes instead of the real thing's half a day. Pumps push real water through it to mimic currents, and the sight of the Bay's tides sloshing in and out of the Golden Gate in miniature makes the geography click. The warehouse itself is a leftover from the Marinship shipyard days, and one corner holds a permanent exhibit on that story, put together by the Sausalito Historical Society with the Corps. Elsewhere you'll find static displays on the model's own Cold War-era origins. Plan on 30 to 45 minutes unless you're the type who reads every placard.
Getting There
The Bay Model sits at 2100 Bridgeway, on the north side of town and well past the downtown shops, so most visitors drive, bike, or take a rideshare rather than walk from the ferry. There's a free parking lot on site, which is more than you can say for most of downtown. The building is close to the Sea Trek kayak dock at Schoonmaker Point, and the waterfront path outside makes it an easy stop to combine with a paddle or a stroll. The Corps describes the center as fully accessible.
Good To Know
Open Tuesday through Friday, 9 a.m. to 3 p.m., and Saturday 9 a.m. to 4 p.m.; closed Sunday, Monday, and federal holidays. When a federal holiday lands on a Monday, the Corps also closes the Saturday before it, so check before planning a long-weekend visit. Admission is free, donations welcome. Call ahead if you're coming specifically to see the model running water, since the Corps occasionally shuts it down for maintenance, and check the center's Facebook page for current news. Groups can book tailored tours through the manager's line.
Our Take
Nobody comes to Sausalito planning to visit an Army Corps warehouse, and that's exactly why it's worth the detour. It's free, it's dry, it's genuinely strange, and it beats anything else in town as a rainy-day plan. Pair it with a Sea Trek kayak rental next door and you've got a full morning, then head to the Marinship exhibit in the corner before you leave so the shipyard shows up in your head the next time you walk past a boatyard.