The River Devon is a tributary of the River Trent, which rises in Leicestershire and joins the Trent at Newark in Nottinghamshire, England. In its upper reaches, it supplies Knipton Reservoir, which was built to supply water to the Grantham Canal, and Belvoir Lakes, designed by Capability Brown. It passes under the Grantham Canal, and then through Bottesford, where it is spanned by five railway bridges, only one of which is still used for its original purpose. On the outskirts of Newark, it passes by two Civil War structures, and just before it joins the Trent it becomes navigable, with a marina located on the west bank. Its name is pronounced "Deevon", not as spelt. Hydrology The river has a catchment of and had an average flow of 29.8 million gallons (135.6 Megalitres) per day, measured at the gauging station in Cotham, near the mouth. However, the gauging station was closed in 1978, due to doubts about the reliability of its measurements, and there is currently no gauging station on the river. The catchment receives of rainfall in an average year. Course The river rises as a series of springs and streams near the villages of Eastwell, Bottesford (Leics) Eaton in north-east Leicestershire, close to the contour, and flows generally northwards. Passing close to Branston, it flows into Knipton reservoir, built in the 1790s to supply the Grantham Canal. The surface area of the reservoir is , and it feeds the canal through a channel, called The Carrier, which has open sections and runs through a tunnel for about . In 2006, British Waterways completed a refurbishment programme on the dam and spillway which cost £170,000. The village of Knipton is a little further to the north, on the eastern bank of the river. An unnamed tributary flows through the village to join the river, after which it enters woodland, where it is joined by a stream flowing eastwards from a small lake called Frog Hollow. Belvoir upper lake and Belvoir lower lake come next, each covering and created by the landscape architect Capability Brown in the grounds of the Belvoir Castle estate. They are used for coarse fishing. Between them, an early 19th-century bridge with five arches and long retaining walls, built from ironstone and limestone, acts as a weir. After the lakes, the river passes to the east of Woolsthorpe-by-Belvoir and the hamlet of Stenwith, to flow under