Forest Lake located near Whitefield and Dalton, New Hampshire
"Ice Out Declared on Forest Lake"
"This year, there were 800 entries in the contest, and a Dunbarton resident guessed that ice out would occur at 7:21 p.m. April 18. It actually happened 26 minutes later, however, when a concrete block broke through the ice on Forest Lake, in the process stretching a rope that then yanked the power cord of an onshore electric clock from its socket."
Read the article and thanks to New Hampshire.com a website of the New Hampshire Union Leader.