River Slea

River Slea
Slea in Sleaford
Location of the mouth within Lincolnshire
Location
CountryEngland
CountyLincolnshire
Physical characteristics
Source 
  locationWest Willoughby
Mouth 
  location
River Witham at Chapel Hill
  coordinates
53°04′11″N 0°11′48″W / 53.069747°N 0.196723°W / 53.069747; -0.196723
Length36.4 km (22.6 mi)
Discharge 
  locationLeasingham Mill
  average0.55 m3/s (19 cu ft/s)

The River Slea is a 36.4-kilometre-long (22.6 mi) tributary of the River Witham, in Lincolnshire, England. In 1872 the river was described as "a never-ending source of pure water", and was a trout river renowned throughout the East coast of England. But in the late 1960s, the Anglian Water Authority took control of the river, and thereafter it became rapidly degraded, due mostly to over-abstraction of water for use in farming.