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 Trustees met again in November 1930, and in 1932 resolved to formally close the navigation. The passing of the Land Drainage Act 1930 meant that they did not need to obtain an Act of Parliament to do so, and instead a closing order was obtained under section 41 of that Act. The Minister of Agriculture and Fisheries confirmed the order on 5 October 1932. A final meeting was held on 16 March 1934, when debts were settled, and the remaining money was split between East Suffolk County Council and the Catchment Board, who had responsibility for the river under the terms of the Land Drainage Act. All records were passed to the clerk of the Catchment Board, and the meeting closed with a vote of thanks to the Trustees' own clerk for his commitment over the years. The waterway gradually fell into decay.