At the Glastonbury end, the canal was required to cross the South Drain and the River Brue. Rennie suggested inverted syphons, rather than locking down into the river and up again, and a cast iron aqueduct for the River Brue crossing was obtained for nearly £3,000 from a Glastonbury blacksmith called John Wright. At the Highbridge end, the plans for a floating harbour to accommodate vessels of up to were dropped, and the entrance lock was moved further along the original course of the River Brue. This saved money, but meant that ships did not have to pay lockage charges to reach Highbridge.