During recent work happening at the Lock 4 site, in Fall River, the contractor uncovered lock stones with mason's marks on them. The Stone Masons were paid on the basis of the number of stones they produced and the marks indicated which Mason did the work. It is believed that the stones were used in the first phase of construction 1826-1831; reused during the second phase of construction period 1854-1861 and continue to be used for the present work.
