WP Franklin Lock on the Okeechobee Waterway is in manatee country. If you go over to the lock to watch the boats go by, you may see some. Boats are required to come to a complete stop whenever manatees are sighted, to keep from cutting the critters with their propellers. AND, if a manatee swims up to the lock gates, the lock operators are required to lock the manatees through to the other side just as if they were boats!
I've never stayed at the Franklin Lock campground, but I spent a week at Franklin Lock for training when I worked for the Corps of Engineers, years before I bought my Airstream. First time I ever saw manatees in the wild instead of in an aquarium.
Engineering: Finding complex solutions to simple problems you didn't even know you had.