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Aldernaig Bridge
Project: Aldernaig Bridge Deck Works
Location: Aldernaig, Invergarry
Client: Scottish and Southern Energy Renewables
This project involved critical structural and environmental works to reinforce and extend the lifespan of the Aldernaig Bridge, ensuring continued safe access and resilience against water-related erosion. The scope included both civil engineering and environmental mitigation measures:
A temporary cofferdam was constructed using bagged gravel and two 3” hydraulic pumps to isolate the work area from the Aldernaig Water. A bypass system was installed using three 600mm diameter, 12m-long pipes to divert the main water flow, ensuring a dry and safe working environment.
The existing abutment, which had been partially undermined by water flow, was stabilised and reinforced. Timber shuttering was installed within the cofferdam to allow the pouring of 7.5m³ of concrete for scour protection and the formation of a kicker for the new abutment wall. Peri formwork was then used to construct the new abutment, tied back to the existing structure, with an additional 7.5m³ of concrete poured to complete the works.
The existing timber deck was carefully removed and replaced with high-quality red cedar beams, chosen for their durability and resistance to environmental degradation, significantly extending the bridge’s service life.
0 +
man hours worked on site
0 m³
of concrete poured for scour protection and abutment works
0 t.
of steel reinforcement installed
0 x
600mm diameter, 12m-long pipes used for water bypass system
