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at Halliwell Priory and owner of the nearby tide mills, erected a structure some time before 1307. River levels were managed by flash locks or sluices, and as the volumes of traffic using the river increased, there was friction between the bargees and the millers, since use of a flash lock affected the head of water available at the adjacent mill. In 1765, the commissioners responsible for the river asked the engineer John Smeaton to survey the river and make recommendations

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