Listed Building

The only legal part of the listing under the Planning (Listing Buildings and Conservation Areas) (Scotland) Act 1997 is the address/name of site. Addresses and building names may have changed since the date of listing – see 'About Listed Buildings' below for more information. The further details below the 'Address/Name of Site' are provided for information purposes only.

Address/Name of Site


Status: Designated


There are no additional online documents for this record.


Date Added
Supplementary Information Updated
Local Authority
Planning Authority
National Park
Loch Lomond And The Trossachs
NN 35610 9400
235610, 709400


Loch Lomond And Trossachs National Park Planning Authority

J R Sutherland, 1910-15, based on designs by James M Gale prior to 1902. 350 yard long dam with crenellated parapet and curved buttresses. Concrete construction faced with coursed, bull-faced red Annan sandstone. Off-centre 9-bay spillway towards N end falling into exit channel basin with curved sides. Buttresses flanking spillway and at regular intervals with shallow machicolated detailing to string course. Crenellated parapet to reservoir side of dam-top walkway; walkway carried over spillway on series of masonry piers; tubular cast-iron railings to land side and over spillway. Crenellated curved wing wall at N end bearing large cast-bronze commemorative plaque.

VALVE TOWERS: 2 octagonal-plan valve houses with deeply crenellated tops and mutulled eaves courses house cast-iron regulating mechanism for compensation supply which flows through dam. Masonry-clad walls to exit channels.

BRIDGE: single-span, segmental-arched bridge with pyramidal-capped piers at each end and standard GCWW railings to parapet. Bull-faced coursed red Annan sandstone; prominent voussoirs. Situated a short distance down stream from the exit channels.

Statement of Special Interest

A well-detailed dam which has a picturesque and prominent position in the landscape and is a relatively early example of concrete construction in Scotland. It was constructed as part of the Glasgow Corporation Water Supply system. Due to its remote location, the materials for the dam were taken up Loch Lomond by barge and then carried to the site by a specially-built cableway that was powered by a hydro-electric plant at Inversnaid.

The Glasgow Corporation Water Works system, which brings water down to Glasgow from Loch Katrine, was admired internationally as an engineering marvel when it was opened in 1860. It was one of the most ambitious civil engineering schemes to have been undertaken in Europe since Antiquity, employing the most advanced surveying and construction techniques available. The scheme represents the golden age of municipal activity in Scotland and not only provided Glasgow with fresh drinking water, thereby paving the way for a significant increase in hygiene and living standards, but also a source of hydraulic power that was indispensable to the growth of Glasgow's industry as a cheap and clean means of lifting and moving heavy plant in docks, shipyards and warehouses. The civic pride in this achievement is visible in every structure connected with the scheme, from the neatly-detailed gates and railings along its route, to the massive masonry structures and iron troughs that carry the conduit and, in most cases, have withstood without failure or noticeable deterioration the daily pressure of many millions of gallons of water for well over 100 years.

Glasgow's Lord Provost, Robert Stewart (1810-66) was the driving force behind the implementation of a municipally-owned water scheme to provide clean water to Glasgow's rapidly increasing population. Loch Katrine was identified as a suitable supply and after some objections from various parties, an Act of Parliament authorising the scheme was passed in 1855. The scheme was built in two main phases following this Act and another 1885. The 1855 scheme, which was opened by Queen Victoria in 1859 and was fully operational by 1860, had been designed to allow for significant expansion as demand increased, and this work was carried in the 20 years following the opening. The 1885 Act allowed a second aqueduct to be built, which followed a slightly shorter course than the earlier scheme. The capacity of the second aqueduct was also expanded during the first half of the 20th century.

The continued expansion of the scheme during the late 19th century meant that a larger supply of water was required to keep Loch Katrine topped-up. Loch Arklet was an obvious source of supply and James Gale, who had been Water Engineer to the City of Glasgow since the opening of the scheme in 1859, drew up plans to increase the capacity of the loch and create a connection to Loch Katrine. An Act of 1902 allowed the work to take place and it was carried out by Gale's successor, J R Sutherland from about 1910 onwards. The other structures connected with this scheme, the Loch Arklet intake and outlet to Loch Katrine are listed separately.

Category changed from B to A following the thematic review of Loch Katrine water supply system in 2008.



shown on 3rd edition Ordnance Survey map (1924-5). RCAHMS and Jelle Muylle, Glasgow Corporation Water Works Loch Katrine Scheme: Loch Katrine to Milngavie (survey report, not published, 2007). R Paxton & J Shipway, Civil Engineering Heritage: Scotland Lowlands and Borders (2007), p330.

About Listed Buildings

Historic Environment Scotland is responsible for designating sites and places at the national level. These designations are Scheduled monuments, Listed buildings, Inventory of gardens and designed landscapes and Inventory of historic battlefields.

We make recommendations to the Scottish Government about historic marine protected areas, and the Scottish Ministers decide whether to designate.

Listing is the process that identifies, designates and provides statutory protection for buildings of special architectural or historic interest as set out in the Planning (Listed Buildings and Conservation Areas) (Scotland) Act 1997.

We list buildings which are found to be of special architectural or historic interest using the selection guidance published in Designation Policy and Selection Guidance (2019)

Listed building records provide an indication of the special architectural or historic interest of the listed building which has been identified by its statutory address. The description and additional information provided are supplementary and have no legal weight.

These records are not definitive historical accounts or a complete description of the building(s). If part of a building is not described it does not mean it is not listed. The format of the listed building record has changed over time. Earlier records may be brief and some information will not have been recorded.

The legal part of the listing is the address/name of site which is known as the statutory address. Other than the name or address of a listed building, further details are provided for information purposes only. Historic Environment Scotland does not accept any liability for any loss or damage suffered as a consequence of inaccuracies in the information provided. Addresses and building names may have changed since the date of listing. Even if a number or name is missing from a listing address it will still be listed. Listing covers both the exterior and the interior and any object or structure fixed to the building. Listing also applies to buildings or structures not physically attached but which are part of the curtilage (or land) of the listed building as long as they were erected before 1 July 1948.

While Historic Environment Scotland is responsible for designating listed buildings, the planning authority is responsible for determining what is covered by the listing, including what is listed through curtilage. However, for listed buildings designated or for listings amended from 1 October 2015, legal exclusions to the listing may apply.

If part of a building is not listed, it will say that it is excluded in the statutory address and in the statement of special interest in the listed building record. The statement will use the word 'excluding' and quote the relevant section of the 1997 Act. Some earlier listed building records may use the word 'excluding', but if the Act is not quoted, the record has not been revised to reflect subsequent legislation.

Listed building consent is required for changes to a listed building which affect its character as a building of special architectural or historic interest. The relevant planning authority is the point of contact for applications for listed building consent.

Find out more about listing and our other designations at You can contact us on 0131 668 8914 or at


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Printed: 25/07/2024 08:22