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Loch Loyne Dam

Dam (20th Century)

Site Name Loch Loyne Dam

Classification Dam (20th Century)

Alternative Name(s) Great Glen Hydroelectric Scheme

Canmore ID 312944

Site Number NH20NW 4

NGR NH 20041 07959

Datum OSGB36 - NGR


Ordnance Survey licence number AC0000807262. All rights reserved.
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Administrative Areas

  • Council Highland
  • Parish Urquhart And Glenmoriston
  • Former Region Highland
  • Former District Inverness
  • Former County Inverness-shire


Field Visit (2010)

Loch Loyne provides a secondary catchment for the northern section of the Greta Glen scheme, feeding water via a tunnel to Cluanie Dam (see separate item). The dam is of relatively low profile with a fixed spillway and dispersal valve. An internal gallery gives access to the valve-house when the dam is on spill or dispersal valve is open. The valve-house also houses a compensation set with the tailrace providing water to the river. The comp set is deeply recessed to maximise the available head in what is otherwise a relatively shallow dam. The dam is of a relatively small scale and of predominantly standard design. PL Payne, 1988, 5; E Wood, 2002, 38; J Miller, 2002.

Note (20 September 2011)

This mass gravity dam of 1956 is 1800 feet in length (548.64 m) and is still in use.

PL Payne, 1988, 152

Information from RCAHMS (MMD) 20 September 2011

Note (25 October 2023)

The Great Glen scheme: Garry/Moriston

The garry part of the scheme uses the storage facility at Loch Quoich to supply Quoich power station via a tunnel from the dam, which is a rockfill type. Two further dams were required at the west end ofthe loch. The outflow goes vis the River Garry to Loch Garry, and eventually via a tunnel to Invergarry power station at Loch Oich. There is a dam at the east end of Loch Garry. A fish stopper and trap were built down stream of Quoich power station.

Storage for Moriston section was provided by damming Loch Loyne and Loch Cluanie, and interconnecting them by a tunnel. A second tunnel from Loch Cluanie supplies Ceannacroc power station which discharges int the River Moriston, which in turn feeds Loch Dundreggan. This loch is also fed by the outflow of Livishie power station, supplied by a system of aqueducts. Glenmoriston power station is just below the Dundreggan dam. Its outflow reaches the River Moriston at Loch Ness via a tunnel. These three power stations were built underground for environmental reasons. The control centre for the the entire scheme is at Fort Augustus. The total output capacity is 114MW. The scheme was built between 1949 and 1962.

Information from NRHE catalogue number WP007424 compiled by George Walker in 2005.


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