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A causeway has existed at La Fosse since at least the 15th century. It was used to power a mill on the left bank. After 1537, it was fitted with a marinière gate. When the Mayenne was canalized in the 19th century, it was destroyed and rebuilt a few metres upstream. The plans for the new lock dam were studied (and perhaps finally drawn up) by the Ponts et Chaussées engineer Lahougue in 1865. The work, supervised by engineer Legras, was carried out by Brest contractors Buré and Crosnier, who...
