Clywedog reservoir

Clywedog reservoir
Clywedog Reservoir
Clywedog Reservoir
Location Llanidloes, Powys
Trefeglwys, Powys
Coordinates 52°29′10″N 3°37′30″W / 52.48611°N 3.625°W / 52.48611; -3.625Coordinates: 52°29′10″N 3°37′30″W / 52.48611°N 3.625°W / 52.48611; -3.625
Lake type reservoir
Primary inflows Afon Clywedog
Primary outflows Afon Clywedog
Basin countries United Kingdom
Max. length 9.5 km
Surface area 2.5 km²
Max. depth 66 m
Water volume 50,000 Megalitres

The Clywedog reservoir (Welsh: Llyn Clywedog) is a reservoir in the Welsh county of Powys, located off the B4518 road near the town of Llanidloes.

The reservoir was formed by damming the Afon Clywedog, a tributary of the River Severn. Its concrete buttress dam is the tallest concrete dam in the United Kingdom, with a height of 72 metres and a length of 230 metres.

Below Clywedog reservoir dam

When at capacity the reservoir contains approximately 50,000 megalitres of water. A second, much smaller embankment dam is located at Bwlch-y-gle to prevent overflow into the next valley.

Construction of the dam commenced in 1963 after the passing of an Act of Parliament ordering its creation to help prevent flooding of the River Severn in winter and to maintain its water levels in the summer. Local opposition was strong against the construction of the reservoir as it would result in the flooding of much of the Clywedog valley and the drowning of 615 acres (2.5 km2) of agricultural land. On top of several disruptions and protests, during construction in 1966 a bomb was detonated within the construction site, setting work back by almost 2 months. The political extremist group Mudiad Amddiffyn Cymru (MAC) was widely suspected of carrying out the bombing.

The reservoir was opened in 1967 and till this day has been in continuous usage, generally filling with water over the winter months and gradually releasing it during the summer months. The reservoir is currently owned and operated by Severn Trent Water Limited with oversight and regulation from the Environment Agency.

The dam operating plant runs self-sufficiently from a 500 kW hydro-electric turbine. The area around Clywedog dam is now a popular leisure destination offering scenic walks and wildlife watching.

In a TV ad for the Land Rover Defender, a Defender 90 is seen winching up the face of the dam under its own power.[1]

External links


  1. ^

Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Clywedog — may refer to: River Clywedog, a tributary of River Dee near Wrexham A tributary of the River Mawddach Clywedog Reservoir, a reservoir in the Welsh county of Powys River Clywedog, Denbigh, a tributary of the River Clwyd See also Clydach… …   Wikipedia

  • Reservoir — This article is about an artificial body of water. For other uses, see Reservoir (disambiguation). The Jhonghua Dam on the Dahan River in Taoyuan County, Taiwan. A reservoir (pronounced either REZ ur vore or REZ er vwar, etymology: from French… …   Wikipedia

  • List of rivers of Wales — This is a list of rivers of Wales, organised geographically, taken anti clockwise, from Hoylake on Wirral through to the M48 Bridge that separates the estuary of the River Wye from the River Severn. Tributaries are listed down the page in an… …   Wikipedia

  • Staylittle — infobox UK place country = Wales official name= Staylittle welsh name= Penffordd lâs latitude= 52.51 longitude= 3.65 population= unitary wales= Powys lieutenancy wales= Powys constituency westminster= Montgomeryshire post town= LLANBRYNMAIR… …   Wikipedia

  • Desert of Wales — The Desert of Wales seen from Drygarn Fawr The Desert of Wales is a term coined to describe a large area in central Wales, so called because of its lack of roads and towns and its inaccessibility. The term was invented by English travel writers… …   Wikipedia

  • Severn Trent — Infobox Company company name = Severn Trent plc company company type = Public (lse|SVT) foundation = 1974 location = flagicon|UK Birmingham, England key people = Sir John Egan, Chairman Tony Wray, CEO industry = Utility products = revenue =… …   Wikipedia

  • Severn Trent — plc Rechtsform Public limited company ISIN GB00B1FH8J72 Sitz …   Deutsch Wikipedia

  • Machynlleth — Coordinates: 52°35′27″N 3°50′56″W / 52.59087°N 3.84887°W / 52.59087; 3.84887 …   Wikipedia

  • New Radnor — For the former parliamentary constituency, see New Radnor (UK Parliament constituency). Coordinates: 52°14′N 3°10′W / 52.24°N 3.16°W / 52.24; 3.16 …   Wikipedia

  • Montgomery, Powys — Coordinates: 52°33′46″N 3°08′57″W / 52.5628°N 3.1493°W / 52.5628; 3.1493 …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”