Project Overview

This project involved improvements to the coastal defences at Trearddur Bay in the north west of Anglesey, to stabilise the existing sea walls and promenade, which were severely damaged by a storm. 

The existing stone revetment at Ravenspoint Road was fortified with the construction of a new reinforced concrete seawall with an armour rock spending beach created on the seaward side. The 3.5 tonne armour stone was produced and delivered by road from a local quarry and placed with 30 tonne excavators equipped with grapples.  At the northern end of the bay, the existing seawall was strengthened with armour rock scour protection. 

The existing masonry sea wall at the central sections of the promenade was reinforced with a new concrete toe and capping beam.  New concrete slabs and precast secondary seawalls were installed along the entire promenade together with new hand railing and street lighting.  A public car park was also enlarged and landscaped.  Adjacent sand dunes which had previously been severely eroded were replenished using sand arising from the site excavations.  The replenished dunes were planted with a variety of coastal plants including sea holly and marram grass. 

The contract was undertaken on a blue flag beach, adjacent to a site of outstanding natural beauty and SSSI and Dawnus assisted the local Trearddur Bay Archaeological Group in the protection of Trwyn Capel monument and chapel remains. The project was carried out during the height of the busy summer months, however through careful planning, liaison with local businesses and stakeholders, and diligent supervision of site operations and logistics, there were no accidents, incidents or near misses and disruption was minimised.

Project Gallery


Isle of Anglesey County Council



Project Value


Contract Period

23 weeks