23/10/2026
🏴 On This Day in Highland History –
On 23 October 1822, the Caledonian Canal opened for through navigation, linking Scotland’s east and west coasts through the Great Glen. It was one of the most ambitious engineering projects of its age.
The idea had been discussed for decades before Parliament authorised the project in 1803. The engineer Thomas Telford, working alongside consulting engineer William Jessop, was appointed to oversee its construction.
The aim was to provide shipping with a safer alternative to the dangerous waters around Cape Wrath and the Pentland Firth, while creating employment and stimulating the Highland economy.
Construction began in 1803–04, with completion expected within seven years. Instead, the canal took around 18 years to complete and cost approximately £900,000, far exceeding the original estimate. I've tried to work out this in todays money and have two sums (Copied directly from Google):
1. Consumer Goods & Services (Inflation-Based)
• Today's Value: £148,431,034
• How it's calculated: This uses the standard UK Composite Price Index. Prices today are roughly 164.92 times higher than they were in 1822. If you were purely converting the purchasing power of everyday goods and services, £900,000 in 1822 buys what about £148.43 million buys today.
2. Large Construction Projects & Economic Share (Project-Based)
• Today's Value: £700 million to £1.1 billion
So why did it take so long?
Although the Great Glen provided a natural route through much of the Highlands, more than 20 miles of artificial canal had to be excavated. Engineers faced difficult ground conditions, drainage problems, harsh weather and the enormous challenge of building a system of locks capable of carrying substantial vessels. At Fort Augustus, porous gravel created particular difficulties, while soft ground at Clachnaharry required careful engineering.
The finished canal stretched for around 60 miles, incorporating four natural lochs — Dochfour, Ness, Oich and Lochy — alongside man-made channels. Its 29 locks raised vessels to a summit level approximately 106 feet above sea level.
The canal’s locks were extraordinary for their time. Measuring approximately 180 feet long and 40 feet wide, they were the largest ever constructed when completed, remaining unsurpassed until the enormous locks of the Panama Canal were built in the early 20th century.
Yet there was a problem. The canal had originally been designed with a depth of 20 feet in mind, but it initially opened with a depth of only around 14 feet. Meanwhile, shipbuilding was advancing, with larger vessels and new iron-hulled, steam-powered ships emerging.
Consequently, some of the larger ships the canal had been intended to serve could not use it. Its difficult mountain passages and strong winds could also make navigation challenging, and the canal never achieved all the commercial success its promoters had hoped for.
One of its most spectacular features is Neptune’s Staircase at Banavie, near Fort William. This remarkable flight of eight locks raises or lowers vessels by approximately 19 metres and remains the longest staircase lock in Britain.
🛤️ Telford’s wider Highland legacy
The canal was only one part of a much larger programme of improvements to Highland infrastructure.
In 1803, the Highland Roads and Bridges Commission was established to improve communications across a region where many communities remained isolated by mountains, rough tracks and difficult river crossings.
Over the following decades, the programme oversaw hundreds of miles of new and improved roads and more than a thousand bridges. These works connected remote settlements, improved access to markets and made the movement of people, livestock and goods considerably easier.
The work also provided paid employment in a region experiencing considerable economic hardship. Recruiting and retaining a reliable workforce was not always straightforward, as workers had to balance construction employment with the demands of agricultural life. Winter fuel in the form of peat still had to be cut and collected. Crops had to be planted and cattle tended.
Several historic bridges associated with this period can still be seen today, including Bonar Bridge in Sutherland, Lovat Bridge near Beauly and Invermoriston Bridge (see photo) on the Great Glen route.
These roads and bridges were more than engineering achievements. They helped transform how people travelled, traded and communicated across the Highlands, leaving a legacy that can still be seen in the landscape today.
