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In page River Shannon:

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With the approaching opening of the Grand Canal, the Grand Canal Company obtained permission from the Directors General of Inland Navigation, and asked John Brownrigg to do a survey which found that much of Omer's work had deteriorated badly, so they started repairs. After protracted negotiations on costs and conditions, the work was completed by 1810, so that boats drawing 1.75 m (5 ft 9 in) could pass from Athlone to Killaloe. Improvements on the lower levels were also undertaken, being completed by 1814.[citation needed]