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North Canal Historic District
The North Canal Historic District of Lawrence, Massachusetts, encompasses the historic industrial heart of the city. It is centered on the North Canal and the Great Stone Dam, which provided the waterpower for its many mill complexes.〔(【引用サイトリンク】title=NRHP nomination for North Canal Historic District (Boundary Increase) )〕 The canal was listed on the National Register of Historic Places in 1975, while the district was first listed in 1984, and then expanded slightly in 2009.〔
The city of Lawrence was founded by industrialist Abbott Lawrence and the associates of the Essex Company as a model industrial city. In 1845 they company acquired land from then towns of Methuen and Andover and began construction on the North Canal and the Great Stone Dam. The work included dredging and building out of "new land", and effectively created a small island between the Merrimack River and the canal, whose outlet is at the mouth of the Spicket River. Work on these two major features was completed in 1848, and development of the city, which formally incorporated in 1853, proceeded from there. The historic district encompasses, in addition to the canal and the dam, the mill-related buildings on the island and on the north side of the canal, as well as a few buildings that front on Methuen and Union Streets, or the connecting side streets. The 2009 expansion of the district, included a single building, the Morehouse Bakery building at 5-9 Mill Street.〔
==Canal and Great Stone Dam==
The Great Stone Dam was constructed across the Merrimack River at a place called Bodwell's Falls, where there is a five foot drop. The dam was built to raise the height of the drop to . It is made of granite blocks laid on a bed of hydraulic cement. At its base it is thick, shrinking to at its top. It has three sections: the central span is , a south wing directs flow to the South Canal, and a wing directs water into the North Canal. It has a gatehouse, from which 24 gates in its sluiceway were controlled before the controls were electrified. Nearby on the island are also the surviving gatekeeper's house, an 1845 Greek Revival wood frame structure, and a c. 1860s barn.〔
The North Canal runs parallel to the Merrimack River, and is long. It ranges in width from at its upper end to where its wasteway joins the Spicket River. The canal is trapezoidal in its cross-section, with walls lined by granite, and a bottom made of granite rubble that has been sealed with clay. It is capable of delivering 4,000 cubic feet of water per second; water power is still used in some of the mills lining its banks. The canal used to have operable locks for navigation; the upper ones were removed and the lower ones were filled in.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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