We’ve been busy this week creating 3 new walks to add to the website – Langsett Reservoir, Goit Stock Falls and Guiseley Beck. All great walks to take in autumn (or winter). Langsett Reservoir Langsett Reservoir, near the villages of Langsett and Upper Midthorpe, supplies water to Sheffield and Barnsley. The reservoir started construction in 1898 and is now managed by Yorkshire Water. It has a total capacity of 1,408 million gallons of water. .