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The Mirwault dam has existed since at least 1414, when a cloth mill and the Fontenailles mill were mentioned. It was fitted with a marinière gate after 1537. When the river was canalized in the 19th century, it was the first mill on the lower Mayenne to be fitted with a lock. The plans for the lock were drawn up by the ingénieur ordinaire des ponts et Chaussées d'Angers in 1847, and the work was awarded by tender to the contractor Piednoir on 29 January 1847. As soon as work had begun, it...