Jeesh, wish I could help you more concerning a 16 footer being launched. I seem to remember a couple boats that size at the campground, there was an "unimproved" launch people were using but just don't want to steer you wrong. Call the wardens up in that area, they'll give you the straight skinny. I was hunting Gero Island in November in 2003 and my canoe was stolen. (Found it a year later at the northeast most camp) Temps were hovering around 0 degrees that evening. Would have shot the ba__tards if I had caught them with my Mad River. Was 50' up on the shoreline with my paddle and life jacket. (they left that cause it had my name and address on it) Plenty of firewood and good friends helped me out of that jam....could have been worse if one was not prepared....... Good luck on Chesuncook....what a great area to fish and enjoy the outdoors.
Hoppes