Manual lock. We found this lock closed to us, so the first thing we had to do was to close the front gate. We were going up river, so we need the lock to release water so we could drive in. Then, after closing the back gate, we have to fill the lock, bringing us up to river level on the other side.
The round disc opens and closes the gate. It is very easy to turn. Note the 2 jacks on the gate. The jacks are what control water coming in/out of the lock once the gate is closed.