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Laggan Locks is a series of canal locks forming part of the Caledonian Canal in Inverness-shire. Completed in 1822, the locks were engineered to enable vessels to navigate the changing water levels between Loch Lochy and the River Spean, facilitating passage through the Great Glen from the Moray Firth to the Atlantic Ocean. The site sits upon fault zone rocks comprising mylonitic and fault-breccia material, products of ancient crustal deformation that influenced both the valley's geology and the canal's alignment through this mountainous terrain.
The locks represent a significant achievement of early nineteenth-century civil engineering, designed to manage the considerable height differential along the canal's route. Their construction reflects the strategic importance placed on improved communications between Scotland's eastern and western coasts during the Napoleonic era. The robustly built masonry structures have largely withstood two centuries of operation, facilitating not only commercial traffic but also recreational use.
The monument is protected by Historic Environment Scotland as a scheduled monument. The Laggan Locks remain integral to the functioning of the Caledonian Canal, one of Scotland's most important engineering legacies, and continue to serve both heritage tourism and recreational boating along the historic waterway.
Caledonian Canal,Laggan Locks is a scheduled monument protected by Historic Environment Scotland under reference SM5295. View the official record →
Laggan Locks is a series of canal locks forming part of the Caledonian Canal in Inverness-shire. It is designated a Scheduled Ancient Monument by Historic Environment Scotland under reference SM5295.
Caledonian Canal,Laggan Locks is a Scheduled Ancient Monument, legally protected by Historic Environment Scotland — the body responsible for designating and safeguarding heritage sites in Scotland. The official designation reference is SM5295.
Several scheduled monuments lie within 10 km, including Caledonian Canal,Laggan Locks to Loch Oich (1.9 km), Invergarry Castle (5.3 km), Caledonian Canal,Loch Oich to Cullochy Lock (9.1 km).
This page is just one thread. A full Aubrey report pulls together 14 strands of Caledonian Canal,Laggan Locks's history, each drawn from the record and mapped to the exact spot:
Every location is different. Not every section appears for every place, only what the historical record actually holds turns up in a report.
Caledonian Canal,Laggan Locks stands on Fault Zone Rocks, Unassigned, bedrock that formed in the Age unknown. The rock here is mylonitic-rock and fault-breccia.