I know this is not the Ohio River however I have a houseboat at Kentucky Dam Marina. They have posted all the docks with signs do not fish into slips. Since I am the fisherman on the dock I hear it all the time that the renters spend 3 to 5 thousand dollars a year to lease that small part of water and they do not appreciate inconsiderate fisherman hitting their boat especially when they are asleep. I have seen slip renters get fishing hooks in their hands when they untie the boat because some one was inconsiderate. I do not believe they can keep you from fishing in marinas however you are going to run into some very unhappy slip renters.