Bascule Bridge

When I think of engineering, there are a lot of buildings in my head. But one of them is really important for a lot cities (and not only!) near sea or river. The bascule bridge.In my project, there's a river between two slopes. There's also a bascule bridge over the river. So how will ship swim? Just pull the bridge up and the ship will be ready to swim. So now move it forward and then if you want to, lower the bridge. So now a red truck can get to the other side of the river!