Unlike the Concord, the Merrimack is not a dead but a living stream, though it has less life within its waters and on its banks. It has a swift current, and, in this part of its course, a clayey bottom, almost no weeds, and comparatively few fishes.
Henry David Thoreau (2016). “A Week on the Concord and Merrimack Rivers”, p.62, Xist Publishing
