Wisbech prior to drainage schemes, it sat on the river Great Ouse. The port is Cambridgeshire's only gateway to the sea. In 1631 Sir Cornelius Vermuyden built the Horseshoe Sluice at Wisbech at a cost of £8,000. In 1680 the trade of Wisbech had increased sufficiently for the port to be reckoned independent and no longer a member of King's Lynn. In 1720 the corporation was licensed to buoy the channel for the first time. By 1751 it was possible in a dry year to walk across the river bed under Wisbech Bridge. Ship building was carried out in the late
Wisbech Canal All traffic passing between the canal and the Nene River was required to pay a toll, which was to be used to maintain the Well Creek. Because of the low level of the Fens landscape, the canal was constructed on embankments for most of its 5.25 mile (8.4 km) length, and was opened in 1797. Flood locks were constructed at both ends of the canal. The one at Outwell was long, but the one at Wisbech was only , and so longer boats wishing to enter or leave the canal at the Wisbech end had to wait for the levels