Drawbridge

Not something you see every day, but often enough that it's not unusual.  The neighboring cities of Alexandria and Pineville, LA are connected downtown by a drawbridge over the Red River and when river traffic comes through they have to raise the drawbridge to let the traffic through.

There, you can see PawPaw stuck in traffic and the road surface of the bridge about 15 feet higher than it normally is.  That bridge will move 30-40 feet vertically to let tug boats through, regardless of the pool stage of the river.   This isn't the only river crossing, there are high-rise bridges both downstream and upstream.