A low maintenance, value engineered design that met the environmental constraints of its unique setting and visually enhanced the surrounding landscape.
Tony Dempsey

Tony Dempsey

SIAC-Ferrovial Joint Venture
Co. Meath


Roughan & O’Donovan developed the alternative conceptual design for this 115m long, 3 span, fully integral bridge, crossing the River Boyne and forming part of the M3 motorway in Co. Meath.


The bridge consists of a central span of 51.5m and 2 side spans of 30.8m eachIt features haunched steel beams, a curved arch profile, masonry clad reinforced concrete abutments, and intermediate piers.

A bespoke parapet reflects the masonry parapet on Ballinter bridge, a neighbouring multi-span 18th century masonry arch.


Our challenge lay in designing a bridge over the environmentally sensitive River Boyne, without impacting the river, its banks or the delicate wildlife habitat below.

The bridge’s central span of 51.5m eliminated the need for supports in the river, thus protecting it and the island from environmental impact.

Services provided:

  • Bridge engineering design
  • Environmental engineering design