I was about that same area years ago in a 10 ft. flat bottom. Saw one about the same way. Thought it was dead. Reached to poke him with a cane pole and he went under and under my boat. Made it rock pretty good. Funny part was the old guy in a boat behind me saw what happened and started hollering "He's coming in the boat...he's coming in the boat". Thought he was too. Big head on that sucker too. Used to count on seeing one over there sunning himself on the bank. Called him ol nub because a big piece of tail was missing. Saw one one night on the bank right next to the ice rink at Pt. Mallard. Friend of mine has a picture of one on the beach area there. Seen several slides on flint creek too.