When I lived in NE Montana, a couple vehicles a year would get lost in the town reservoir. Usually, it was guys driving out to the shed they had set up for ice fishing (every year we had a mini-town out on the ice with orderly streets and everything lined up all nice). Except there was this one time a county road commissioner drove a Caterpillar road maintainer out on the ice and lost it nearly immediately.
The local tow guys knew better than to drive out on the ice though. They towed out all the vehicles in the spring.
P.S. Ice gets pretty thick at -30.
