Lough Derg (Shannon)
|Primary inflows||River Shannon|
|Primary outflows||River Shannon|
|Max. length||38.6 km (24.0 mi)|
|Max. width||12.9 km (8.0 mi)|
|Surface area||130 km2 (50 sq mi)|
|Average depth||7.6 m (25 ft)|
|Max. depth||36 m (118 ft)|
|Water volume||0.887 km3 (0.213 cu mi)|
|Residence time||0.15 years|
|Shore length1||179,000 m (587,000 ft)|
|Surface elevation||33.5 m (110 ft)|
|Settlements||Garrykennedy, Portumna, Killaloe & Ballina, Dromineer, Terryglass|
|1 Shore length is not a well-defined measure.|
Lough Derg (from Irish Loch Deirgeirt, meaning "loch of the red eye") is the second-largest lake (or lough) in Ireland and is the third-largest in the whole island (after Lough Neagh and Lough Corrib). It is a long, relatively narrow lake, with shores in counties Clare (south-west), Galway (north-west), and North Tipperary (to the east). The lake is the last of the three largest on the River Shannon, with the other two, Lough Ree and Lough Allen lying further north. Some towns and villages on Lough Derg include Portumna, Killaloe & Ballina, Dromineer, Terryglass, Mountshannon and Garrykennedy.
At its deepest, the lake is 36 metres deep and covers an area of 130 km² (50.2 sq miles). Close downstream of where Lough Derg empties into the Shannon are the falls of Doonass, the largest fall on the otherwise gently sloping river, with the nearby location of the world's then-largest hydroelectric power plant at Ardnacrusha in 1927.
In the nineteenth century, Lough Derg was an important artery from the port at Limerick to Dublin through the canals in the midlands of Ireland. Navigable over its full 40 km length, Lough Derg is today popular with cruisers and other pleasure traffic, as well as sailing and fishing. The University of Limerick have an activity centre by the lake, just north of Killaloe, where there are canoes, kayaks, windsurfing, sailing dingies, and other recreations.
In June 2013, 35 people were brought to safety when a major rescue effort was undertaken after an international rowing event was hit by severe weather.
- Scarriff (location of regional Waterways Ireland office)
- International Lake Environment Committee Foundation
- Hilliard, Mark. "Lough Derg rescue operation brings 35 ashore after rowing event". www.irishtimes.com. THE IRISH TIMES. Retrieved 22 June 2013.
- "Sea eagles return to Irish nest". The Irish Times. 2012-04-30. Retrieved 2012-04-30.
- RTÉ: Rare eagle reintroduced to Ireland
- White-tailed Eagle
- Waterways Ireland ePortal
- Alien species threatening ecology of Lough Derg Irish Examiner, February 18, 2011
- Asian clams threaten Lough Derg fish stock Dan Danaher, The Clare Champion, 21 June 2012.
|Wikimedia Commons has media related to Lough Derg (Munster).|