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 first proposal for the construction of the navigation was in 1719, but the traders of Ipswich objected, fearing loss of trade. It was not until 1789 that six local gentlemen (two of whom were vicars) with foresight realised that because of poor transport, due to badly-maintained turnpike roads, the population and industries were dwindling in the Stowmarket area. They engaged William Jessop, who employed Isaac Lenny as the surveyor and a Parliamentary Bill for the construction of the navigation was introduced on 17 February 1790. It became an Act of Parliament on 1 April 1790, and created a Board of Trustees, consisting of six men. They were empowered to borrow £14,300 to finance the work, and an additional £6,000 if this became necessary. They also had powers to build an extension of the navigation from Stowupland Bridge for to the turnpike road that ran to Bury St Edmunds. An unusual clause in the act prohibited the carrying of fishing tackle by boats using the navigation, for which a fine of £5 could be charged.