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The Western Mill site on the west side of Railroad Street provides the best view of a sequence of dams on the Branch River that successively hold back the water for the raceway. Behind a relatively small dam is the principal barrier, Middle Dam (1849), with yet another built behind it late in the nineteenth century. Middle Dam is an especially splendid masonry structure of very large blocks, in all 300 feet long with a rollway 160 feet wide for a twenty-foot fall of water.