Alright, made it thru the thread and am sad that it's not got more good info in it, but these cases can be very difficult when there's just not much in MSM.
A bit of info about the adirondacks, where my family has vacationed every year for the better part of two decades... it's the USA's largest natural wildlife preserve (no hunting allowed, and the animals run rampant - there are TONS of bears, we see them every time we're up there, wandering in parking lots and eating out of trash cans).... the weather as stated was in the neighborhood of -50F for two days straight with windchills factored in, there's been areas of flooding/icejams up that way during this time of freeze, melt, and rain recently.... and what about Beaver River?
Beaver River. You can only access it by boat in the summer or by snowmobile/cross country skiing in the winter. It has a very small handful of year round residents. The Norridgewock is the name of the "hotel/restaurant/generalstore/place where there is the one phone on the island"... summer access is across the Stillwater reservoir, winter you can probably get there via the means mentioned from a few other areas.
http://www.beaverriver.com/home/
My mom had a friend with a cabin up there in the 80s, we went there every summer, we'd be on a boat for a solid hour before hitting the island. There are lots of homes/camps there, most without electricity or running water back then.. not sure about now. Almost all of them are seasonal. There's no police department or school or church or anything, despite having a couple of year round residents (according to wikipedia, make that "eight").
Wonder if he read about the place and made his way there?
http://en.wikipedia.org/wiki/Beaver_River,_New_York