The southern arm of the River Torne was blocked. The course of the other arm was straightened by cutting a drain, and its waters emptied through a sluice into the River Trent at Althorpe.
A second long drain was cut from Idlestop to Dirtness. This ran parallel to the River Torne and the water was sluiced into the River Trent at Althorpe. In the early 19th century an addition outfall - Folly Drain - was constructed at . At a later stage these outfalls were replaced by a new outfall for 'the three rivers' at Keadby.
Geography
The village lies within the civil parish of Keadby with Althorpe which includes the hamlet of Derrythorpe to the south. To the south of the village is the large civil parish of Belton, North Lincolnshire, and next to the River Trent is part of West Butterwick. It is one of twelve parishes in the Isle of Axholme, and before 1996 was in the Boothferry district of Humberside. Althorpe is in the Axholme North ward of North Lincolnshire. There were eight parishes in the Isle of Axholme. Amcotts was created from part of Althorpe in 1850. The King George VSwing Bridge crosses the River Trent near Althorpe to connect the Isle of Axholme to Scunthorpe and the rest of North Lincolnshire. The A18 crosses the bridge, and until the M180 motorway - to the south - opened in 1979, this was the main east-west route to Grimsby. The A18 previously went through the village but was diverted to the north-west.
Community
Althorpe Grade I listedAnglican church is dedicated to St Oswald. Built in 1483 by Sir John Neville, it is of Perpendicular style. During a restoration in 1868 sedilia were found to have been erected on a marble slab dedicated to 14th-century rector William de Lound. The ecclesiastical parish covers the approximate area of the civil parish, with St Oswald's church shared with Keadby in the combined parish of Keadby with Althorpe. The parish group of churches includes those at Amcotts and Belton. St Oswald's church is in the older part of Althorpe. Althorpe and Keadby Primary School, and the Post Office, are in the newer part near the bridge over the River Trent. The village public house is The Dolphin - the Original Dolphin Inn stood on the River Trent at the end of Ferry Lane, originally Dolphin Street. Althorpe railway station, which lies to the north of the village on the South Humberside Main Line, is closer to Keadby.