Thoreau writes in his journal:
The testimony of the farmers, etc., is that the river thirty to fifty years ago was much lower in the summer than now. Deacon Richard Heard spoke of playing when a boy on the river side of the bushes where the pads are, and of wading with great ease at Heard’s Bridge, and I hear that one Rice (of Wayland or Sudbury), an old man, remembers galloping his horse through the meadows to the edge of the river . . . Colonel David Heard, who accompanied me and is best acquainted of any with the details of the controversy,—has worked at clearing out the river (I think about 1820),—said that he did not know of a rock in the river from the falls near the Framingham line to perhaps the rear of Hubbard’s in Concord . . .
Daniel Garfield, whom I met fishing on the river, and who has worked on Nine-Acre Corner and Lee’ s Bridges for fifty years or more, could remember one year when Captain Wheeler dug much mud from the river, when the water was so low that he could throw out pickerel on each side outside the bushes (where the pads now are) . . .
Ebenezer Conant remembers when the Canal dam was built, and that before that it used to be dry at midsummer outside the bushes on each side. Lee says that about 1819 the bridge near him was rebuilt and the mud-sills taken up . . .