Landing a first stage rocket (F9R) in the ocean has been stated that it is corrosive and will damage rocket components, thus making rapid reusability impossible or too expensive to repair each component. The other goals are to land on a barge or return to a launch pad on land. While we're still waiting for success, what is the affect of fresh water on a rocket? Would dropping a first stage rocket in a fresh water lake allow for rapid reusability? I don't know what the affect of fresh water, perch, walleye, and catfish is on a first stage rocket, but I imagine it is less than a fireball after smacking a barge or salty ocean water.
One site I had in mind would be the Great Lakes, specifically, Lake Erie. In Cleveland it has rail connecting the docks at the Lake to a NASA flight center and international airport (8km from lake).