Inventors and firsts
What if you could shrink the whole bay?
Sausalito's Bay Model. A true story near Sausalito, CA, told for kids 4–7.
The U.S. Army Corps of Engineers Bay Model story, read aloud
Look out the window! See that big, long building? Inside it is the whole San Francisco Bay! Not the real one, a tiny pretend one, shrunk down so small you can walk all the way around it. It has the bay, the rivers, the islands, and real water that sloshes in and out like the real tides.
Swish, swoosh! It's like the world's biggest bathtub, but nobody is allowed to bring a rubber duck. Long ago, a man wanted to build big walls called dams right across the bay. So grown-ups built this model to test his idea first. The tiny bay showed them it would not work, so the dams were never built.
Today kids and families can visit and see it for themselves. Can you guess what you would want to test in a tiny bay? A paper boat, maybe?
Quiz the back seat
Why did people first build the tiny bay?
Show the answer
To test an idea about building dams. Yes! The model showed the dams would not work. Today kids and families can visit and see it for themselves.
U.S. Army Corps of Engineers Bay Model facts for kids
- The Bay Model is a working scale model of San Francisco Bay and the Sacramento-San Joaquin River Delta.
- It was finished in 1957 to test the Reber Plan to dam the bay, and tests showed the plan would not work.
- It is no longer used for science but is open to the public as a visitor center.
Questions kids ask about U.S. Army Corps of Engineers Bay Model
What is the Bay Model?
It is a giant working model of San Francisco Bay and its rivers, with real water and tides, inside a building in Sausalito.
Why was the Bay Model built?
It was built to test a plan to put dams across the bay, and the tests showed the plan would not work.
Can you visit the Bay Model?
Yes, it is no longer used for science but is open to the public as a visitor center.
For grown-ups
Written with AI from public sources, then checked claim by claim against the sources below before it was published; stories that don't pass stay off the app and this site. Narration is pre-recorded, and nothing you do on this page is tied to your kids.
Sources
More stories in Sausalito
The first people here Who Lived Here First?
You live in Sausalito, right on the edge of Richardson Bay. But who lived here before there were any houses at all?
Trains, ships and planes When the Train Met the Boat
Here in Sausalito, right by the water, is the ferry dock. A ferry is a big boat that carries people across the water, like a bus that…
Long, long ago The Town Named for Trees
You live in Sausalito, a town by the bay. And its name is a word puzzle!
Cars and roads The One-Lane Tunnel
Uh oh, see that traffic light? This tunnel is so skinny that only one direction of cars can go through at a time!Build one with bricks
How things work: roads, bridges, oceans →All stories →
Between stories: 25 road trip games for kids · Road trip bingo cards · Road trip trivia · Christmas light scavenger hunt · Christmas trivia
Town and county names: GeoNames (CC BY 4.0).