River Gipping
During 1791, when the Trustees were negotiating with John Rennie, they had asked him to assess an extension of the navigation from Stowmarket to the River Lark at Bury St Edmunds, but this was not pursued. With the navigation thriving, there were two proposals for canals from Ipswich to Eye, Suffolk in 1819. A meeting was held in January at Eye, which was chaired by Charles Cornwallis, 2nd Marquess Cornwallis. It considered two reports, one proposed by the civil engineer William Cubitt, which involved a tunnel through the hills at Mendlesham, with the estimated cost exceeding £100,000, and another, for a canal over the hills, costing £80,000. Both were thought to be too expensive to implement, but a third proposal emerged, for an extension from the River Gipping at Needham Market, which would follow the valley of a tributary through Creeting St Mary to Earl Stonham, where a basin would be built beside the turnpike road (now the A140 road). This would enable waggons to make a round trip from Eye in a single day, rather than the two days that a trip to Ipswich took. The scheme was estimated to cost £12,000, and shares in it were offered at the meeting. Although many were taken up, the scheme did not advance any further.
River Gipping
The main cargoes on the navigation consisted of agricultural produce which travelled down stream, with coal and other heavy goods travelling in the opposite direction. Initially, there were up to four barges working on the navigation, and tolls for the first year amounted to £460. The number of barges then increased to 10 but frost and flooding in early 1795 caused serious damage, and £1,000 had to be spent on repairs. Despite a short-term fall in income, the tolls for the year ending in July 1795 came to £937. Subsequently, details of receipts were not recorded in the minutes of the Trustees, so are unknown, but they did record that barges were making over 30 trips each week in the early 1800s. Each trip took around seven hours. James Austin was appointed as surveyor in October 1804, but absconded in 1805. The Trustees advertised in the Cambridge newspapers, offering a reward of 10 guineas (£10.50) if he could be apprehended and placed in jail.