Forth Road Bridge (Original)
Firth of Forth, Scotland, UK · 1958–1964 · £12m (1964 prices)
The judgement call
Account-gated at launchOne of the most significant suspension bridges of its time, demonstrating advanced engineering techniques. - The bridge faced challenges with increasing traffic volume and weight, leading to the construction of the Queensferry Crossing. - Early detection of broken steel wires and corrosion in cables highlighted the importance of continuous inspection and maintenance for aging suspension bridges.
Key engineering challenges
Construction of large towers and decks over a tidal estuary. - Managing the logistics of handling massive quantities of steel and concrete. - Dealing with complex aerodynamic forces on a long-span suspension bridge. - Addressing long-term issues like cable corrosion, deck fatigue, and joint deterioration.
Project facts
- Client / owner
- Forth Road Bridge Joint Board (originally)
- Lead contractor
- Sir William Arrol & Co. Ltd., Cleveland Bridge & Engineering Company, Dorman Long (Bridge & Engineering) Ltd. (joint venture)
- Lead designers
- Mott, Hay and Anderson; Freeman Fox & Partners
- Project type
- new build
- Scale
- 2.5 km (1.5 miles) total length; 1,006 m (3,300 ft) main span; 39,000 tonnes of steel; 125,000 cubic metres of concrete
- Disciplines
- Civil; Structural; Geotechnical
- Standards & frameworks
- British Standards relevant to the period of construction
Sources: The Forth Bridges: https://www.theforthbridges.org/about-the-forth-bridges/forth-road-bridge/ - Wikipedia: https://en.wikipedia.org/wiki/Forth_Road_Bridge - BBC News (2015): https://www.bbc.com/news/uk-scotland-edinburgh-east-fife-34983063 - BBC News (2024): https://www.bbc.com/news/articles/cz735jrg5xvo - Historic Environment Scotland: https://blog.historicenvironment.scot/2024/09/forth-road-bridge/