Bill, Inland waterways (Mississippi river, LakeTahoe, great lakes) are under Coast guard jurisdiction and patrol. But in the real world you would probably be assisted by other agencies. This is simple logistics. The Coast Guard ( SOP) is grossly underfunded. My own recent misadventure bears witness to that. When I talked to the local SAR unit , they related they were to overwhelmed to get out to us that night. The C.O. at least added that upon learning there was an ex coastie involved they attended to more urgent missions. I think? that was a compliment?Also, to be blunt, Some Coast Guardsmen of my period were total salt water sailors. This was tragically born out when a Warrent officer lost his ship with casualties. He was utterly confused by the inland buoy system. This is totally different from our well known "red right returning" of the ocean. Best bet always; find out who will be out there and say hello. It's amazing how even a cursory familiarity with each other can better prepare both parties for potential problems.<br><br>