🚢 What if a bay had its own salt-water channel?

Look out the window at the bay! This water joins San Pablo Bay, the top part of San Francisco Bay. So here's a question. Could a giraffe walk across it? In lots of spots, a tall giraffe could stand up and keep its head dry!

Most of this bay is really shallow. Two big rivers pour into it, and they carry tiny bits of mud from far away. When the river water slows down in the bay, the mud sinks to the bottom, like sand settling in a bucket of water. Little by little, all that mud piled up and made the bay shallow. But big ships need deep water!

So right down the middle there's a deep path, like a secret hallway. Workers scoop out mud to keep it deep. Ships follow it all the way to faraway cities like Sacramento and Stockton. Look far out on the water. Can you spot a big ship?