the lower level needs to be around 14-16 ft, to be on the safe side for a fiberglass boat. If you have never put a boat on the falls you might want to take someone with you that has. There is a couple of hair pin turns that you have to make even though it looks like you can run up anywhere. if you get out of the channel you can kiss you lower unit goodbye. The best place to launch is off Harrison ave in Clarksville. its right there only have to motor your boat maybe 1/2 mile. up to the falls. LOL



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