Thanks, Rogue. I once read about one particular Red River lock that is something like 84ft wide by 785ft long and can lift 31ft vertically, which sounded awfully big (not Carrier big, but large, built for the Casinos and junk I suspect), so it made me wonder. I don't recall what the maximum draught for those locks is.

It's wild seeing that Submarine being tugged up river. I imagne a Cold War river system full of them. Creepy, kind of.

Yellow Tang are beautiful little fish. Thanks for those details, too, Hound Dog. Makes sense, the naming.

The lake I'm on in E. TN has a dam with lock and our channel is maintained at 9 ft. We are the most upriver lock in the TVA system I think (Clinch River). The rest of the locks are on the TN River. Pretty sure all of them maintain at least 9 ft of depth inside the channel markers. Enough for barge traffic, but probably not enough to sneak a sub in...