Thoreau writes in his journal:
pleasured the snow again. West of railroad, 15; east of railroad, 11 4/5, average 13 2/5, Trillium Woods, 16 3/4. The last measurement was on the 7th, when it averaged about sixteen inches in the open land . . .
The thickness of the ice on Walden in the long cove on the south side, about five rods from shore, where the water is nineteen and a half feet deep, is just twentysix inches, about one foot being snow ice. In the middle it was twenty-four and a quarter on the 11th. It is the same there now, and undoubtedly it was then twenty-six in the long cove . . .