tomdennis says:

Big fish story.
When I 1st started working at the Locks and Dam I used to walk across the dam everyday during the 1980’s. On my way home one evening I stopped to watch the fish working below the dam. At one point I saw what I thought was a piece of plywood come to the surface (1/4 of 4X8 sheet) ; but what was odd in seeing this piece roll up and then back down to disappear was that it curled like the fin of a fish as it went down.
Holy ~!@#!
Divers had told us that sometimes something huge would rub against them in the murky waters below the dam and I had seen some as big as fifty pounds being pulled out of those waters. Just before that period of time a towboat hauling soybeans plowed into the dam dumping one full load of soybeans (1400 tons) at the dam. Fishing has been great but a little dangerous since then.