Articles
The Kincardine Bridge:
Celebrating 90 Years
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Spanning the River Forth, just eight miles south-east of Stirling, the Kincardine Bridge has played a vital role in Scotland’s road network for nearly a century. Opened in October 1936, it was a remarkable feat of engineering for its time and remains an enduring symbol of Scottish ingenuity.
Plans for a new crossing first emerged in the 1920s, as growing traffic placed increasing pressure on existing routes across the Forth. In 1930, the renowned engineering firm Sir Alexander Gibb & Partners was appointed to design what would become, for a time, Scotland’s longest road bridge. Its opening transformed travel across central Scotland, easing congestion in Stirling and providing a much-needed connection between communities on either side of the river.
One of the bridge’s most distinctive features was its original swing span, which could rotate to allow vessels to pass along the river. This mechanism remained in operation until 1988, adding another fascinating chapter to the bridge’s engineering history.
Today, the Category A listed Kincardine Bridge remains an important part of Scotland's trunk road network, connecting the M876 motorway with the A985. Despite the opening of the nearby Clackmannanshire Bridge in 2008, the historic crossing continues to carry substantial traffic, with official figures for 2024 recording an average of approximately 11,600 motor vehicles per day.
Key Data
Location of Kincardine Bridge across the River Forth, linking Kincardine with the Falkirk area.
Planning and Design
By the 1920s, the growing popularity of motor transport was placing increasing pressure on Scotland’s road network. In Stirling, rising traffic volumes crossing the River Forth via Stirling Bridge on the A9 were causing serious congestion in the city's streets. Alternative crossings were few and far between, with only a handful of ferry services operating at Queensferry, Kincardine and Alloa. When these services were unavailable, motorists travelling along the east coast could face a detour of around 50 miles.
The need for a new road bridge was becoming increasingly clear. In 1925, a report submitted to the Ministry of Transport, which was responsible for Scotland’s roads until April 1956, examined possible crossings at Alloa and Kincardine. Although Kincardine offered several advantages, concerns over local ground conditions tipped the balance in favour of Alloa. Consulting engineers Mott, Hay & Anderson were appointed to develop plans for the proposed crossing, but economic difficulties prevented significant progress.
The project gained fresh momentum in 1930, when Fife County Council commissioned Sir Alexander Gibb & Partners to investigate the feasibility of a bridge at Kincardine. Crucially, records from boreholes drilled in 1890 for an earlier, unrealised railway tunnel scheme provided valuable evidence that the ground could support a major new crossing.
In June 1930, representatives from the Ministry of Transport, the counties of Fife and Clackmannan, and the burghs of Dunfermline, Falkirk, Alloa and Stirling met to consider the competing proposals. They agreed that a joint report should be prepared to assess the merits of both locations. The report, submitted in August, demonstrated that the Kincardine option offered the greatest benefits, and that it would be cheaper to construct. A Joint Board, tasked with the delivery of the new bridge, was formed shortly after.
Northern spans of the bridge under construction in 1936. Photo taken from the swing-span central support. © Newsquest (Herald & Times).
A parliamentary hearing was held in Edinburgh in March 1931 to consider the proposed crossing. The scheme that emerged provided for a bridge 2,696 feet long, incorporating a movable swing span that would create two openings, each 150 feet wide, to allow river traffic to pass. When closed, the swing span would provide a maximum clearance of 30 feet above high water, while its opening mechanism would accommodate vessels of up to 2,000 tons.
The plans also included substantial improvements to the surrounding road network, with approach roads extending 2,200 yards and 500 yards on either side of the river, together with a new 700-yard bypass around Kincardine. The Ministry of Transport initially offered to fund 85% of the project's cost, although the difficult national economic situation later saw this contribution reduced to 75%.
Formal approval for the bridge was granted on 8 July 1931, and tenders were invited that December. Twelve bids were received, with the Cleveland Bridge and Engineering Company submitting the lowest, at £238,609.
Despite securing parliamentary approval, a further two years passed before construction could proceed. The project was finally given the go-ahead in September 1933, with work beginning on site that December. After more than a decade of discussions, investigations and planning, the long-awaited Kincardine Bridge was at last becoming a reality.
Structural Design
The Kincardine Bridge was designed as a multi-span structure, combining steel and reinforced concrete to meet the varying demands of its location. Its arrangement was carefully tailored to the surrounding landscape, ground conditions and the need to accommodate both road and river traffic.
Rather than adopting a uniform design throughout, the engineers developed a series of different span types, each suited to a particular part of the crossing. The resulting structure was both practical and economical, with its distinctive arched girders giving the bridge much of its architectural character.
A technical paper published in 1936 described the bridge's principal components, arranged from north to south, as follows:
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Northern railway crossing: Three continuous spans, each measuring 62 feet 6 inches, carried the bridge over the London and North Eastern Railway. These followed a curve of 520 feet radius, allowing the bridge to connect with the northern approach road.
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Northern steel spans: Seven spans of 100 feet, constructed using a cantilever arrangement incorporating shorter 50-foot girders in alternate spans. This economical and practical method of construction was particularly well suited to the distinctive arched profile adopted for the main girders.
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Central swing span: A 364-foot-long steel structure of Warren truss construction, balanced symmetrically around a central pivot on Pier 11 in the middle of the river. A substantial timber jetty, measuring 470 feet long and 50 feet wide, was provided to protect the moving structure from passing vessels.
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Southern steel spans: A further seven spans of 100 feet continued the crossing towards the southern shore, maintaining the characteristic appearance of the northern steelwork.
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Reinforced concrete spans: Nine spans of 50 feet, constructed in reinforced concrete with arched undersides designed to complement the profile of the adjoining steel girders.
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Southern approach viaduct: A 265-foot-long reinforced concrete viaduct, supported on piles, completed the crossing at its southern end.
Supporting the structure were 19 reinforced concrete supports of varying sizes and designs, reflecting the different loads and ground conditions encountered along the route. Many were founded directly on rock, providing firm foundations for the substantial structure above.
The bridge deck was designed to accommodate a 30-foot-wide carriageway, flanked by two five-foot-wide footways and edged with granite kerbs. At either end of the swing span, imposing concrete portals housed sliding gates, each weighing four tonnes, which could be closed to prevent vehicles from entering while the bridge was opening.
The SS Roken passes the bridge in February 1949. Two channels, each 150 feet wide were provided for vessels of up to 2,000 tonnes. © The Scotsman Publications Ltd.
The Swing Span Mechanism
At the heart of the design was the remarkable 1,600-tonne swing span, the longest of its kind in Europe at the time. Despite its enormous weight, the structure could be rotated in just a few minutes, allowing vessels to pass along the River Forth.
The mechanism was powered by two 50-horsepower direct-current electric motors, with a backup diesel generator provided to maintain operation in the event of a power failure. At the push of a button, the turning machinery sprang into action, rotating the immense structure on a series of precision-engineered rollers beneath the span. Manufactured to exceptionally fine tolerances, these rollers were crucial to ensuring the bridge could move smoothly and reliably.
Once the swing span returned to its closed position, hydraulically operated locking bolts secured it firmly in place, allowing road traffic to resume. The design also incorporated a control room above the swing span and an engine room below, housing the equipment needed to operate this remarkable piece of machinery.
Construction
Construction of the Kincardine Bridge began in December 1933 and was completed in less than three years, with the new crossing opening on 29 October 1936. At the height of the project, more than 200 men were employed on site, with no major accidents recorded throughout the contract.
The first stages of construction involved driving piles to support the bridge and building temporary timber access bridges out from each shore. These were fitted with railway tracks, allowing cranes, materials and other equipment to be moved into position as work progressed across the river.
On the northern side, the reinforced concrete piers were constructed using large chambers known as caissons, which allowed foundations to be excavated down to solid rock beneath the riverbed. Excavated material was loaded into wagons and transported away along the temporary access bridges.
Working in the tidal waters of the Forth presented considerable challenges. Water repeatedly found its way into some of the foundation cylinders, complicating excavation and eventually requiring the use of compressed air to keep the working areas dry. Throughout construction, a 150-foot-wide channel also had to remain open to allow shipping to continue along the river.
The scale of the undertaking was impressive. More than 4,000 tonnes of steel and approximately 150,000 rivets were used in the bridge's construction. The steelwork, designed to meet Ministry of Transport loading requirements, was supplied by Sir William Arrol & Co. of Glasgow and transported to the site by rail. Some of the girders were so long that they had to be delivered in sections and assembled on site before being lifted into position by cranes operating from the temporary access bridges.
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The bridge control room was finished to a high standard and designed to operate 24 hours a day. Its position high above the carriageway provided operators with unobstructed views of both the bridge and the River Forth.
Building the Swing Span
One of the most demanding elements of the project was the construction of the enormous swing span, completed in mid-1936. Its assembly required considerable precision to ensure that the structure and its complex moving components would operate smoothly and reliably.
Before delivery to Kincardine, the steelwork underwent a trial assembly at the fabrication yard to check that its components fitted together correctly. On site, the swing span was erected in the open position, allowing vessels to continue using the river channel while construction progressed.
A permanent timber jetty was also constructed to protect the swing span when open. Completed in autumn 1935, it was built from high-quality Canadian Douglas fir treated with creosote to withstand prolonged exposure to the river environment.
Architectural Finishing
Although designed primarily as a practical road crossing, considerable attention was paid to the bridge's appearance. Its distinctive concrete portals, marking the entrances to the swing span, were decorated with the coats of arms of Stirling, Fife and Clackmannan, while the bridge's name was prominently displayed in bronze lettering.
The sliding gates incorporated into the portals were given an ornamental finish, combining an essential safety function with the architectural character of the crossing.
The bridge was further enhanced by decorative lamp standards fitted with 20-inch Morocco-glass globes, elegantly profiled parapet railings and carefully finished steelwork. Together, these features gave the structure a distinctive appearance, reflecting the importance attached to its visual impact as well as its engineering.
High above the carriageway, the swing span's control room was designed to give operators an uninterrupted view of the bridge, river and approaching traffic. Large windows were installed on all sides, while mess and welfare facilities were provided for staff responsible for operating the crossing around the clock.
Connecting the Road Network
Work on the approach roads progressed alongside construction of the bridge and was completed well before the crossing opened.
To the south, a new single-carriageway road connected the bridge with the existing route between Grangemouth and Stirling. Parts of this connection now form sections of the A985 and M876.
On the northern side, a new road linked the crossing with the Dunfermline to Alloa route, while a bypass was constructed to divert through traffic away from the centre of Kincardine. This route is known today as Feregait.
Together, these improvements ensured that the new bridge would become an important link in central Scotland's expanding road network.
Contract Summary
Opening and Operation
A New Crossing for Central Scotland
The long-awaited Kincardine Bridge officially opened to traffic at noon on 29 October 1936. The ceremony was performed by the Conveners of Fife, Stirlingshire and Clackmannanshire, marking the successful completion of a project that had been discussed for more than a decade.
The new crossing proved an immediate success. Within just one week of opening, more than 1,200 vehicles were using the bridge each day, demonstrating the demand for a direct road connection across this part of the Forth.
For the first time, motorists travelling between Fife and central Scotland could cross the river at Kincardine without relying on ferry services or making lengthy detours through Stirling. The bridge quickly established itself as an important part of the country's road network, improving connections between communities and supporting the growing demands of motor transport.
Life as a Working Bridge
For more than fifty years, the Kincardine Bridge performed a dual role, carrying road traffic across the Forth while opening to allow ships to pass along the river.
At its busiest, the swing span was operated more than fifty times a month, with each opening potentially taking up to twenty minutes. Although an impressive feat of engineering, these interruptions became increasingly frustrating for motorists as traffic volumes grew. By the 1970s and 1980s, queues of waiting vehicles had become a familiar sight, testing the patience of more than a few drivers!
By 1987, daily traffic had risen to more than 20,000 vehicles, placing considerable pressure on a crossing originally designed for a very different era of motoring.
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The Bridge Masters
The operation of the swing span required experienced staff, responsible for ensuring the safe passage of both road traffic and shipping. At the centre of this work was the Bridge Master, who oversaw the bridge's day-to-day operation.
Between 1936 and 1988, just four men held this position at Kincardine, reflecting the continuity and experience of those entrusted with the crossing.
The first Bridge Master, James Boyd, was later presented with a British Empire honour in the bridge's control room. Another notable figure was George Reid, the third Bridge Master, who spent more than forty years working on the crossing.
The responsibilities of the Kincardine staff extended beyond the River Forth. They also oversaw other Scottish swing bridges, including those at Inchinnan and Banavie, drawing on their specialist knowledge of movable bridge operation.
Final Opening
By the 1980s, the Kincardine Bridge's ageing mechanical equipment was becoming increasingly difficult and costly to maintain. With river traffic in decline and a major refurbishment needed to keep the swing mechanism operational, the Scottish Office proposed permanently fixing the bridge in its closed position.
The proposal proved controversial, attracting opposition from local residents and former bridge staff who were keen to preserve this distinctive feature of the crossing. Nevertheless, following a public inquiry, the plans were approved in 1987, bringing more than fifty years of swing bridge operation towards an end.
On Sunday 31 January 1988, the Kincardine Bridge opened for the final time. Hundreds of people gathered to witness the historic occasion, marking the end of an era for a structure that had been a familiar part of life along the Forth since 1936.
Among those present was transport photographer Donald Stirling, whose photographs captured the bridge's final opening and provide a fascinating record of this significant moment in its history.
Work to permanently secure the swing span in its closed position was completed by the end of 1989. The former control and engine rooms were preserved as a museum, providing a lasting reminder of the remarkable machinery and the people who had kept the bridge operating for more than half a century.
In 1987 it was decided that the bridge would be permanently closed to river traffic. On 31st January 1988, the bridge swung open for the last time. Hundreds of onlookers gathered for the occasion. © Donald Stirling
You can view more of Donald's photos from the event here.
The Bridge Today
Ninety years after its opening, the Kincardine Bridge remains an important part of Scotland's road network. Now managed by Transport Scotland on behalf of the Scottish Ministers, the historic crossing continues to carry substantial traffic, with official figures for 2024 recording an average of approximately 11,600 motor vehicles each day.
In 2008, the bridge was joined by a new upstream neighbour, the Clackmannanshire Bridge. Built to ease congestion and improve transport connections across the region, the new crossing provided an alternative route across the Forth, diverting traffic away from Kincardine town centre and reducing pressure on the original bridge.
The Kincardine Bridge's historical and engineering significance was formally recognised in February 2005, when it was designated a Category A listed structure. This prestigious status reflects its exceptional architectural and technical interest, including its distinctive steelwork and remarkable former swing span.
Preserving such an important structure while maintaining its role as a busy road crossing presents an ongoing engineering challenge. Over the years, substantial investment has been made to safeguard the bridge's future, including the installation of new street lighting in the late 2010s and the replacement of its southern piled approach viaduct between 2023 and 2025.
Further improvements, including refurbishment of the bridge deck and repainting of its extensive steelwork, are anticipated as part of continuing efforts to protect the structure and extend its working life.
Almost a century after construction began, the Kincardine Bridge remains a remarkable achievement of Scottish engineering. Although its days as a working swing bridge are long over, it continues to fulfil the purpose for which it was built, connecting communities on either side of the Forth while standing as an enduring reminder of the ambition, ingenuity and craftsmanship of its designers and builders.
From the Archive
Films
A short documentary was produced in the late 1980s to chart the history of the bridge. It also discusses its permanent closure. A copy was recently uploaded to YouTube and can be viewed below.
Further Reading
This article was first published in October 2021. Updated October 2026.
Related Content
A special podcast to mark the 85th anniversary of the bridge was released in October 2021. It can be heard below.