page_title: South Forty-Foot Drain
section_title: Navigation
hierarchical_section_title: South Forty-Foot Drain / Navigation
caption_attribution_description: Black Sluice Lock, en:The Haven, Boston
context_page_description: The South Forty-Foot Drain, also known as the Black Sluice Navigation, is the main channel for the land-drainage of the Black Sluice Level in the Lincolnshire Fens. It lies in eastern England between Guthram Gowt and the Black Sluice pumping station on The Haven, at Boston. The Drain has its origins in the 1630s, when the first scheme to make the Fen land available for agriculture was carried out by the Earl of Lindsey, and has been steadily improved since then. Water drained from the land entered The Haven by gravity at certain states of the tide until 1946, when the Black Sluice pumping station was commissioned.
  The Drain was navigable until 1971, when improvements to the pumping station led to the entrance lock being removed. It is currently being upgraded to navigable status by the Environment Agency, as part of the Fens Waterways Link, with a new entrance lock being completed in December 2008, giving access to the first 12 miles of the drain, and the upgrading of the southern section, including a link to the River Glen to allow navigation to Spalding forming phase 2 of the project.
context_section_description: Prior to 1971, the Drain had been navigable, and in 1939, it was listed as being navigable for 21 miles (34 km), from Boston to Gutham (sic) Gowt. Boats up to 70 feet (21 m) long and 18 feet (5.5 m) wide, with a draught of about 7 or 8 feet (2.1 or 2.4 m) could use the waterway as far as Donington Bridge, but above that, the draught decreased to 3 to 4 feet (0.9 to 1.2 m). It was only open to commercial craft, as pleasure craft were expressly prohibited. It is unclear whether there was ever a right of navigation, or whether the Black Sluice Commissioners simply allowed it. The entrance lock was 72 by 20 feet (21.9 by 6.1 m), and most trade was between Boston and Donnington Bridge, with pleasure boating not being allowed prior to 1962. Navigation ceased in 1971, when the lock was closed and removed, with little protest being made. More recently, the East Anglian Waterways Association promoted the idea that the Drain could again be made navigable as part of a larger scheme to improve leisure facilities. The local authorities which were part of the Fens Tourism consortium conducted a feasibility study, and this report was formally adopted as the Fens Waterways Link by the Environment Agency in 2004, with the support of the local authorities, the East Anglian Waterways Association and the Inland Waterways Association.
  The scheme involved a total of 150 miles (240 km) of waterway, of which 50 miles (80 km) would be new cruiseway, while the rest would be existing waterways which could be upgraded or have their access improved. When completed, it would connect the Rivers Witham, Glen, Welland, Nene and Great Ouse, and was heralded as the biggest waterway enhancement project in Europe by the Environment Agency.
  In 2007 they obtained funding for the link between Boston and Spalding.  Work on a new lock beside the Black Sluice pumping station at Boston - to connect The Haven and the South Forty-Foot Drain - was formally started on 8 February 2008, and was completed in December 2008, with the official opening ceremony being held on 20 March 2009. The lock project formed phase 1 of the scheme, and the cost of £8.5 million was jointly funded by the European Regional Development Fund, the East Midlands Development Agency, and Lincolnshire County Council. The lock is designed to be used for a period either side of high tide, and so there is a rise from the Drain to the Haven. It has conventional mitre gates at one end, but uses rotating sector gates at the tidal end, each one weighing 12.1 tonnes.
  The lock opened up nearly 12 miles (19 km) of waterway. As part of the upgrade, new 48-hour moorings were constructed on The Haven, for boats about to enter the Drain, and on the South Forty-Foot Drain near the Black Sluice pumping station at Boston, at Swineshead Bridge and at Hubbert's Bridge.
  The upper limit of navigation was initially Donington High Bridge, where the Swaton Eau joins the South Forty-Foot Drain and provides a wider section where boats can be turned. Beyond the bridge, the drain was officially only suitable for canoes and kayaks.
  However, eight narrow boats cruised on the waterway at Easter 2009, and although the channel was narrower and not as deep after Donington Bridge, all of them successfully reached Kingston's Bridge, some 3.7 miles (6.0 km) further on, where the outlets from Dowsby Fen and Gosberton pumping stations provided enough width to turn a 70-foot (21 m) boat. Further progress was blocked by scaffolding erected so that the bridge could be re-decked, rather than by lack of water.
  The drain has been renamed as the Black Sluice Navigation by the Environment Agency. In order to use the navigation, an Environment Agency licence is required, and as there are no permanent moorings available on the drain, these are available for one day or seven days.
  Water levels are maintained at a lower level during the winter months, when flows are high, and the Drain needs to be able to cope with higher volumes of rainfall, than during the summer months, when navigable levels are maintained. As on the neighbouring River Witham, 
caption: The new lock at Black Sluice, allowing navigation from The Haven to the Drain
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