 The reservoir itself (known as Ogden Water) is sourced from water draining off Skirden Edge, through Skirden Clough, to the west and from the north the reservoir takes in water from Deep Gulf and Spa Flat, above the now disused Fly Delph Quarry, through the Great Scar and Ogden Clough.The reservoir is deep, holds of water and was completed in 1858 to supply fresh water to Halifax.The water is surrounded by of mixed conifer and broad leafed nature reserve that attracts 300,000 visitors a year.