Laggan Dam, Concrete gravity dam near Kilmonivaig, Scotland
Laggan Dam is a concrete gravity dam near Kilmonivaig that spans across the River Spean with 24 segmental arches forming its structure. The construction features a stone retaining wall supported by granite foundations that have held the weight of water for decades.
The dam was built in 1934 by Balfour Beatty to supply water power to an aluminium smelter at Inverlochy. This project represented a major industrial development in the Highland region.
The dam received Category A listing status in 2011, recognizing its engineering excellence and contribution to Scottish industrial development.
The dam is accessible from the A86 road between Fort William and Spean Bridge with free parking nearby. Information panels on site explain the structure and how it operates.
The structure contains six self-priming siphons that automatically regulate water levels through a clever air valve system. This engineering solution allows water flow to be controlled passively without external machinery.
Location: Highland
Location: Kilmonivaig
GPS coordinates: 56.88950,-4.67306
Latest update: December 9, 2025 18:47
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