The Gwash at Manton, before it enters Rutland Water
|Region||Lincolnshire, Rutland, Leicestershire|
|- elevation||168 m (551 ft)|
|19 m (62 ft)|
|Length||39 km (24 mi)|
|River system||River Welland|
The River Gwash, a tributary of the River Welland, flows through the English counties of Leicestershire, Rutland and Lincolnshire. It rises just outside the village of Knossington in Leicestershire, near the western edge of Rutland. It is about 39 kilometres (24 mi) long.
The source of the river is just north-west of the village of Knossington, but the Gwash is formed of several small headwaters that come together near Braunston-in-Rutland before passing the site of Brooke Priory at and running westward to pass under the railway Northwest of Manton ( ).
The Gwash then helps to fill the Rutland Water reservoir which was formed by damming its valley at Empingham. From the reservoir a controlled flow is released to maintain the flow around Tolethorpe Hall and Stamford and into the River Welland. The flow is enhanced by the Gwash's tributary, the North Brook, at in Empingham, which significantly helps maintain riverlife.
East of Stamford, its course is now fixed but it lies in a small flood plain which shows clear signs of the river's former meandering. The pasture fields include depressions which fill in wet seasons forming oxbow lakes, though they are not of the classical shape. Near Stamford it is the parish boundary between Stamford and Uffington.
West of Stamford, the Gwash crossed the Stamford Canal, requiring some elaborate hydraulic works. Although the canal has been dry for over a century, the Borderville weir has only just been removed, and some meanders re-watered.
The river feeds the millpond at Newstead Mill in the parish of Uffington before entering the Welland at Newstead Bridge just east of Stamford.
The name appears to be derived from the Old English (ge)waesc 'a washing, a flood'. The earliest form was "le Whasse" (c1230); the use of an initial G- is first recorded in 1586 and the spelling 'Gwash' appears to be a quasi-Welsh spelling.
- Wheeler and Batty (1896), p.291
- "The Guash fishing club". Guash fishing club.
The River Guash or Gwash (the u is an ancient spelling) is a small limestone trout stream that runs in the valley from Braunston-in-Rutland to where it joins the Welland just downstream of Stamford.
- Page, William, ed. (1935). "Parishes: Brooke". A History of the County of Rutland: Volume 2. Victoria county history. pp. 37–40. Retrieved 18 January 2016.
- "A history of Rutland Water" (PDF). Anglian Water. June 2009. Archived from the original (PDF) on 24 January 2013. Retrieved 26 May 2013.
- "River Gwash, Rutland". News. The wild trout trust. Retrieved 26 May 2013.
- "Update on the 'Wash to the Guash' sea trout project being carried out by the Welland rivers trust". Club news. Guash fishing club. Archived from the original on 7 July 2013.
- "Returning Ratty to our rivers comes at a price - removal of the American mink". Leicester Mercury. 7 January 2011. Retrieved 26 May 2013.
- Peay, Stephanie (2001). "Eradication of alien crayfish populations" (PDF). Environment Agency. Retrieved 26 May 2013.
- The Place-Names of Rutland by Barrie Cox (EPNS, 1994), p2
Media related to River Gwash at Wikimedia Commons