The New Bedford River, also known as the Hundred Foot Drain because of the distance between the tops of the two embankments on either side of the river, is a navigable man-made cut-off or by-pass channel of the River Great Ouse in the Fens of Cambridgeshire, England. It provides an almost straight channel between Earith and Denver Sluices. The river is tidal, with reverse tidal flow being clearly visible at Welney, some 19 miles (31 km) from the sea.
History In the 1620s, there was discontent in the region through which the New Bedford River now flows, as the land was regularly inundated by flood water. Francis Russell, 4th Earl of Bedford, who owned huge tracts of land in the vicinity, agreed to carry out drainage works in 1630, in return for 95,000 acres (38,000 ha) of the land which would be reclaimed. He was joined in the project by thirteen other adventurers, who formed a corporation and obtained a charter to carry out the work in 1634. The Dutch engineer Cornelius Vermuyden was engaged to oversee the work, which included nine major drainage channels, including the Bedford River, which ran from Earith to Salter's Lode. The tract of land through which it ran became known as the Bedford Level, and the scheme was declared to be complete in 1637. However, in 1638, that decision was reversed, and King Charles I became the undertaker to ensure the work was completed. The adventurers were given 40,000 acres (16,000 ha) for the work that had already been carried out, and further work was again to be overseen by Vermuyden, but little work was done, as the English Civil War intervened. The existing works were neglected, and some were deliberately damaged during the hostilities. In 1649, interest in the drainage of the Bedford Level resumed, and a second Drainage Act was obtained. It became known as the 'Pretended Act', and authorised William Russell, the 5th Earl of Bedford, to carry out further work, the chief of which was a second channel parallel to the Bedford River. Vermuyden was again the engineer, and the new channel was completed in 1652. The Bedford River became known as the Old Bedford River, and the new channel became the New Bedford River. Sluices were built at Earith and Denver, and the river carried most of the flow of the River Great Ouse, resulting in its old course via Ely becoming just a drainage channel. The Corporation of the Bedford Level was set up, and took control of the river and the drainage channels, under the terms of the General Drainage Act, passed in 1663. This move was not popular with those engaged in navigation on the Great Ouse, as the sluices were operated for the benefit of the drainage scheme, and boats often had to wait for days or weeks while the sluices remained closed. The destruction of the Denver Sluice in 1713, caused by exceptional flood levels, was celebrated by the boatmen, but the resultant flooding led to the Corporation building a new sluice between 1748 and 1750. The concerns of the boatmen were placated by the provision of a navigation lock in the structure.
Some of the workers who built the New Bedford River may have been Scottish prisoners-of-war captured at the Battle of Dunbar, since a number of such prisoners were used on drainage schemes in the Fens, because labourers were scarce. After 1652, they were supplemented by Dutch prisoners, as a result of sea battles between Admiral Blake and Lieutenant-Admiral Tromp during the First Anglo-Dutch War, and probably by a colony of French workers stationed near Thorney Abbey. Towards the northern end of the washes, the New Bedford River is joined by the River Delph at Welmore Lake Sluice. The origins of this channel, which is sometimes called the thirty-foot drain, are obscure, although it was built to assist the removal of water from the washlands, according to C. N. Cole writing in 1784. Prior to 1825, there was a dam where the sluice is located, and water was let out of the washland by cutting a slot in it, which the flood water enlarged as it passed through. The cost of rebuilding the dam at the end of the process was considerable, and this unsatisfactory arrangement was replaced by a sluice. At the same time, the New Bedford River was made wider and deeper, while some of the flood banks were also raised. At its southern end, the River Delph is connected to the Old Bedford River at a double bend near Welches Dam. The northern half of the Old Bedford River is no longer connected to its southern half. It is not known exactly when this configuration was built, although it may have been between 1789 and 1821, since Cole's map of 1789 shows the Old Bedford River proceeding in a straight line, and Baker's map of 1821 shows two rivers, each with a double bend. Blair argues for a date soon after the New Bedford River was built, however, since Welches Dam is named after Edmund Welche, who worked with Vermuyden, and the dam in question was originally built across the Old Bedford River.
Course The New Bedford River follows a fairly straight course, heading approximately north-east for 20.8 miles (33.5 km) from Earith to Denver Sluice. While there are no real restrictions on the length or width of boats, draught is limited to 2 feet (0.6 m) and headroom to 7.8 feet (2.4 m), although the river is tidal, and so these values can fluctuate depending on the state of the tide. The Environment Agency advise that navigating up the river is best attempted when there is a tide of at least 24 feet (7.3 m) at King's Lynn, and boats should enter the river at Denver soon after the tide turns. Water levels tend to rise steeply for about two hours after the tide turns, and then drop gradually over the next ten hours. Care is needed to ensure that boats remain in the centre of the channel, particularly during the winter months when the river may be overflowing into the Ouse Washes. Despite being some 35 miles (56 km) from the sea, water levels at Earith still rise and fall by about 2 feet (0.6 m) on a spring tide, and by a few inches for a neap tide.
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