...erceptible at that point, the Lowell dam having flowed it out. The second work, fifteen miles further up, at Cromwell's Falls, consisted of a dam and single lock. Then came dams and single locks at Moor 's, Coos', Goff's, Griffin's and Merrill's Falls. About a mile above Merrill's Falls were the lower locks of the Amoskeag, a canal next in importance to the Middlesex Canal. It was only about a mi...