The upper river is marked by the presence of four large reservoirs, used for the impounding of drinking water. Drinking water for the people of Sheffield was provided by five small reservoirs on a site close to Langsett Road. Others were added as the population grew, but by 1830, they could not keep up with the demand. Sheffield Water Company became responsible for water supply after an Act of Parliament was passed in 1830, and their first major reservoir was completed in 1836, when Wyming Brook was dammed to form the Redmires Middle Reservoir.