In some years it may thaw and freeze again.

 

March 30.

March 30, 2017

High water, — up to sixth slat (or gap) above Smith's second post. It is said to have been some nine inches higher about a month ago, when the snow first went off. 

R. W. E. lately found a Norway pine cut down in Stow's wood by Saw Mill Brook. 

According to Channing's account, Walden must have skimmed nearly, if not entirely, over again once since the 11th or 12th, or after it had been some time completely clear. It seems, then, that in some years it may thaw and freeze again.

H. D. Thoreau, Journal, March 30, 1861

High water —nine inches higher about a month ago, See March 30, 1855 ("The river is but about a foot above the lowest summer level.")

R. W. E. lately found a Norway pine. See February 27, 1851 ("Saw to-day on Pine Hill . . . a Norway pine, the first I have seen in Concord. . . . It was a very handsome tree, about twenty-five feet high.")

 Walden must have skimmed nearly, if not entirely, over again once since the 11th or 12th. See March 11, 1861 ("C. says that Walden is almost entirely open to-day, . . . This shows how many things are to be taken into account in judging of such a pond. I have not been able to go to the pond the past winter. I infer that, if it has broken up thus early, it must be because the ice was thin, and that it was thin not for want of cold generally, but because of the abundance of snow which lay on it.")  Compare March 30, 1856 ("These cold days have made the ice of Walden dry and pretty hard again at top. It is just twenty-four inches thick"); See also A Book of the Seasons, by Henry Thoreau, Ice-Out