Loch Sloy Dam


Site Name Loch Sloy Dam

Classification Dam

Alternative Name(s) Loch Sloy Hydro-electric Scheme; Inveruglas Water

Canmore ID 92619

Site Number NN21SE 2.1

NGR NN 28871 11074

Datum OSGB36 - NGR

Ordnance Survey licence number 100020548. All rights reserved.
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Administrative Areas

  • Council Argyll And Bute
  • Parish Arrochar
  • Former Region Strathclyde
  • Former District Dumbarton
  • Former County Dunbartonshire

Archaeology Notes

NN21SE 2.01 28871 11074

Dam [NAT]

OS 1:10,000 map, 1976.

Loch Sloy (1950). Buttress dam [NN21SE 2.01] on Loch Sloy (Balfour Beatty & Co), with main tunnel and surge shaft (Edmund Nuttall Sons & Co) leading to pipeline [NN30NW 7.01] (Sir William Arrol & Co) feeding a power station [NN30NW 7.00] (Hugh Leggat Ltd) on Inveruglas Bay, on Loch Lomond. Average annual output 120 mW.

J Miller 2002.


Aerial Photography (3 May 2007)

Field Visit (2010)

Loch Sloy Dam forms the storage reservoir for Sloy power station (see separate item). The dam is of buttress type with a fixed spillway to the centre and integrated tunnel intake gatehouse to the upstream side of the dam allowing water to enter the tunnel through to the power station. The dam is 56 meters high and 357 meters long. This large dam is of pioneering design, which was first proposed by prominent dam designer James Williamson in a lecture in Washington DC in 1936. The buttressed design represented a significant saving in materials over the construction of a traditional mass concrete gravity dam. This type of dam was increasingly commonly used in the later schemes developed by NoSHEB, under the influence of James Williamson who was the lead member of the NoSHEB technical panel. P L Payne, 1988, 5; E Wood, 2002, 38; J Miller, 2002.


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