OhioFamilyof5
If you're already in the area or passing by it's worth it to just check it out. It's interesting and really big but not really worth making a special trip for unless you're into dams.
SilverTravZ
Lock and Dam #10 is a vintage double-chambered lock on the Muskingum Water Trail. Land access through alley at approx 800 Hughes. Locks are about one mile south of dam on diversion channel. Unusual "gate valves" permit viewing of water flows. Both valves and gates are manually operated. Great photo opportunities for enthusiasts. No viewing bridge. Boats transit at irregular times. Hazard for injury to the inattentive. Not a land destination for scout or home schooling groups; these groups should arrange to lock through by boat. Because of the gate valves you will see most of the operation. Before entering the area by land, request permission of lock master. For your safety, expect to be told exactly where to stand.