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The Silent Valley Reservoir is located in the Mourne Mountains near Kilkeel, County Down in Northern Ireland. It supplies most of the water for County Down, surrounding counties and most of Belfast. It is owned and maintained by Northern Ireland Water Limited (formerly DRD Water Service). The reservoir was built between 1923 and 1933.
Wikipedia: Link

Images relating to Belfast & District Water Commissioners buildings and gates found throughout County Down between the Mourne Mountains and Belfast. They are found in and around the Silent Valley and in numerous places above the underground Mourne Conduit which carries water to Belfast. The buildings are mainly pumping stations, wells or houses (mostly now vacant) for staff. The red gates were erected, mainly through farmland, so that BWC staff (linesmen) could walk the length of the Mourne Conduit and visually check for problems at the surface. The posts have BWC cast into the metal at the top (Belfast Water Commissioners - see J3452 : BWC gate near Ballynahinch for a close-up) and there are a few to be found where the letters are back to front! The gates are also found in several places on the Mourne Wall - see J2923 : Stile and gate on the Mourne Wall and J3228 : The Mourne Wall at the Hare's Gap for examples.

See also the associated shared description for The Mourne Wall at Link .