The river froze over last night.

 December 13. 

The river froze over last night, – skimmed over.

H. D. Thoreau, Journal, December 13, 1850

The river froze over last night, – skimmed over. See  December 13, 1852 ("River and ponds all open. Goose Pond skimmed over"):  December 13, 1856 ("The river is generally open again."); December 13, 1859 ("My first true winter walk is perhaps that which I take on the river, or where I cannot go in the summer. It is the walk peculiar to winter, and now first I take it. . . . Going over black ice three or four inches thick . . . Now that the river is frozen we have a sky under our feet also."); December 16, 1850 ("The river is probably open again.") See also November 21, 1852 ("I am surprised this afternoon to find the river skimmed over in some places."); November 30, 1855 ("River skimmed over behind Dodd’s and elsewhere. Got in my boat. River remained iced over all day."); November 30, 1858 ("The river may be said to have frozen generally last night."); December 5, 1853 ("The river frozen over thinly in most places and whitened with snow"); December 5, 1856 ("The river is well skimmed over in most places,"); December 6, 1856 ("The river is generally frozen over, though it will bear quite across in very few places. "); December 7, 1856 ("Take my first skate to Fair Haven Pond"); December 9, 1859 ("The river and Fair Haven Pond froze over generally last night, though they were only frozen along the edges yesterday. This is unusually sudden.") and A Book of Seasons, by Henry Thoreau, First Ice.