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The Neuville causeway is shown on Jaillot's map (1706), along with the two mills it controlled on the right and left banks. When the Mayenne was canalised in the 19th century, it was replaced by a lock dam. The work was carried out by the Ponts et Chaussées engineer Legras, based on plans studied and perhaps definitively drawn up by his predecessor Lahougue. They were awarded on 12 September 1874 by tender to the Brest contractors Buré and Crosnier. The passage was opened to navigation in...
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