I would assume that there are a lot of waterways that are in fact navigable and that have many recreational properties along them. People have their docks, or perhaps a raft--let's say a ten-by-ten or twenty-by-twenty structure--that they swim to or jump off. Would that be considered an impairment? Would they need a permit to have that raft out there?
On February 28th, 2008. See this statement in context.