Erie Canal Lock No. 20, near Fort Hunter, Montgomery County, as it appeared in 1969. The lock was later filled in to prevent the walls from collapsing. (Jack E. Boucher, Historic American Engineering Record, Library of Congress)
Erie Canal Lock No. 20, near Fort Hunter, Montgomery County, as it appeared in 1969. The lock was later filled in to prevent the walls from collapsing. (Jack E. Boucher, Historic American Engineering Record, Library of Congress)