Trade on the upper part of the navigation to Stowmarket was extremely limited, with just an occasional barge carrying manure to Prentice's Manure Works, and returning with guncotton, which was manufactured at an explosives works. There was more traffic between Ipswich and Bramford, as barges regularly worked to Fison's and Packard's factories. The companies paid lower tolls because they helped to maintain the lock gates and clear weeds from the channel. 30-ton barges were worked through the lower four locks in trains of two dumb barges with a steam-powered barge pulling them. By 1917, the undertaking was virtually bankrupt. Income amounted to around £220 per year, with expenditure running at £480, and there was no capital left. The Trustees tried to make economies, but in May 1922, with the current account overdrawn, they resolved to close the navigation from 3 June 1922.