Spelga Reservoir is a reservoir in the townland of Spelga (Irish: Speilgeach, meaning "abounding in pointed rocks") in the Mourne Mountains of County Down, Northern Ireland. It was formed by the Spelga Dam and sits at over 1,200 ft (370 m) above sea level. It has a volume of 2,700,000 cubic metres and a catchment area of 5.423 km². It occupies an area known as Deers Meadow, and impounds the River Bann, which rises on the nearby Slieve Muck. The reservoir and dam were built as part of a project that had origins in the idea of supplying water to Belfast, in 1894. The Spelga Reservoir itself was developed between 1953 and 1957. As part of the construction, the B27 road was rebuilt above the reservoir to replace the original road submerged by the construction. The Dam was designed by the Belfast engineering firm of R. Ferguson and S. McIlveen and construction was undertaken by John Laing & Sons.The Portadown and Banbridge areas receive their water supply from the reservoir. Whilst it has not been stocked with fish for some years, it is home to wild trout.In 2018 and again in 2020, heatwaves and dry weather caused the water level to drop. This exposed a portion of the original road through the Deers Meadow, including a bridge which was formerly the first bridge on the River Bann.
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