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broken into 29 bays by piers that support a roadway across the dam. As well as the spillway, there are six self-priming siphons embedded into the centre of the dam, controlled automatically by system of air valves. The siphons are set to operate in pairs, priming at 820.5, 821.0, and 821.25 feet OD
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The dam impounds Laggan
Reservoir and Loch Laggan, which are connected via a short section of the River Spean. This was dredged and straightened over a length of approximately 1.3 miles (2 km) to the confluence of the
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through three miles (5 kilometres) of tunnel. From there, the waters travel through a further 15 miles (24 kilometres) of tunnel, 15 feet (4.6 metres) in diameter, before descending the hillside to a power house at
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232:(250.1, 250.2, 250.3 m OD), and discharge through 4′2″ (1.3 m) diameter Glenfield-Kennedy jet disperser pipes. Laggan Dam was the first large siphon spillway used in the UK.
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The dam is about 700 feet (210 metres) long, and 48 m (157 ft) high between the level of the foundations and the crest of the spillway. It is curved upstream like an
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The reservoir has a capacity of 40,000,000 cubic metres (1.4 billion cubic feet), between a top water level of 820 feet (250 m)
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453:
The Hydro: A study of the development of the major hydro-electric schemes undertaken by the North of
Scotland Hydro-Electric Board
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and construction was finished in 1934. The supervising engineers were the firm of C S Meik and
William Halcrow, now known as the
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in 1985. It was upgraded to
Category A listing in 2011, following a review as part of Hydroelectric Power Thematic Survey 2010.
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Between 1941 and 1943, the catchment was further expanded by constructing another dam across the headwaters of the
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298:"Lochaber Hydroelectric Scheme and Aluminium Smelter, Loch Laggan Dam (Category A Listed Building) (LB6835)"
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which diverts flow from the River Mashie into the River
Pattack. This can be seen at the side of the A86 road in
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from Fort
William, however there is no public access over it. The catchment area of the dam was increased by an
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and maximum drawdown level of 804 feet (245 m) OD, giving an operational range of 16 feet (4.9 m).
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414:"The Second-Stage Development of the Lochaber Water-Power Scheme (includes photographs and appendices)"
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The whole crest of the dam, except for a section in the middle that houses equipment, is a
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The structure was built as part of the
Lochaber hydroelectric scheme by
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of 2,000 ft (610 m), but works purely on the principle of a
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Water flowing over the spillway and the pipes in the centre of the dam
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International
Commission on Large Dams of the World Power Conference
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Remedial drainage to Laggan and
Blackwater gravity dams
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Category A listed buildings in
Highland (council area)
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480:Magazine cover showing the dam under construction
319:"Record Details - Loch Laggan Hydro Electric Dam"
371:Wallis, R. P.; Morison, A . C.; Gunstensen, R.
418:Journal of the Institution of Civil Engineers
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455:. Aberdeen: Aberdeen Univ. Pr. p. 14.
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153:. It forms the second reservoir for the
505:Energy infrastructure completed in 1934
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349:International Commission on Large Dams
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323:Highland Historic Environment Record
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180:The dam was designated a Category B
242:Water from the dam is conveyed to
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254:The dam can be found next to the
515:1934 establishments in Scotland
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412:Naylor, A H (February 1937).
294:Historic Environment Scotland
235:The foundations are built on
155:Lochaber hydroelectric scheme
251:through five steel pipes.
137:is a mass concrete gravity
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171:British Aluminium Company
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451:Payne, Peter L. (1988).
430:10.1680/ijoti.1937.14769
128:700 ft (210 m)
120:48 m (157 ft)
500:Dams completed in 1934
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80:56.88972°N 4.67333°W
206:radius of curvature
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325:. Highland Council
218:Amhainn Ghuilbinn.
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151:Scottish Highlands
85:56.88972; -4.67333
462:978-0-08-036584-8
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104:Dam and spillways
96:Opening date
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396:: 145. 1964.
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390:"Laggan Dam"
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327:. Retrieved
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301:. Retrieved
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424:(4): 3–48.
351:: 79. 1936.
210:gravity dam
147:Loch Laggan
143:River Spean
112:River Spean
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59:Coordinates
489:Categories
277:References
271:River Spey
244:Loch Treig
135:Laggan Dam
68:56°53′23″N
44:Laggan Dam
35:Laggan Dam
24:Laggan Dam
438:0368-2455
378:(Report).
329:30 August
71:4°40′24″W
303:27 March
260:aqueduct
256:A86 road
229:spillway
202:arch dam
169:for the
109:Impounds
53:Scotland
49:Location
237:granite
204:with a
161:History
149:in the
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188:Design
125:Length
117:Height
376:(PDF)
457:ISBN
434:ISSN
331:2013
305:2019
99:1934
426:doi
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139:dam
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222:OD
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
