The River Ant was navigable to Dilham prior to 1810, when consideration was given to extending navigation northwards along the course of the river. Plans were drawn up by William Youard and John Millington in 1811 and it was one of Millington's two plan that formed the basis of a bill presented to Parliament in early 1812. It was opposed by the inhabitants of Worstead and Dilham, who feared that their businesses would collapse if boats could reach North Walsham, but the navigation was nevertheless authorised by an Act of Parliament dated 5 May 1812, which created the Company of Proprietors of the North Walsham and Dilham Canal Navigation. They had powers to raise £30,000 by the issuing of shares, and a further £10,000 if required, either from shares or by mortgage. Work on the construction of the canal did not start until 1825, with some of the delays caused by a claim for damages made by Issac Harris Lewis, who owned his own staithe at Dilham and felt that the new canal would damage his trade. His case was heard in April 1825 and he was awarded £1,500 in compensation. Work began in the same month, employing 100 men from Bedfordshire.