We found this trail on AllTrails app. The Deep Lock Quarry Metro Park was next to the National Park, so we only had to drive a couple of minutes to get to this trail.
The trail was about 1.4 miles, although we added a little bit on with a side trail. It had a few informational signs about things along the trail. There were remains of Quaker Oat millstones, the remains of sandstone blocks from a loading dock, bases of old derricks used to load boats/trains.
There was the old quarry as well. You could see the layers of cut out rocks.
We took a side trail to see Lock 28, which was the deepest lock of the Ohio Erie Canal and was nicknamed Deep Lock. The lock was a little overgrown, but still easily seen. It was really neat to see the remains of the canal system.