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N4 Collooney to Castlebaldwin






Project Description

The N4 Collooney to Castlebaldwin Scheme in County Sligo involves the upgrade of 14.8km of National Road, comprising of 13.8km of Type 2 Dual Carriageway and 0.9km of Standard Single Carriageway tie in. The scheme includes a 3km greenway, four overbridges, six road underbridges, two clear span river bridges, 39 culverts and associated diversion, two at-grade roundabouts and one grade separated junction. It involves 3.3M m3 of earthworks, of which 500,000m3 is peat excavation, and works in a karst environment.

Services Provided

Clandillon Civil Consulting acted as Designers in a Joint Venture with Fehily Timoney Ltd on behalf of Roadbridge, who were appointed by Sligo County Council. As the Project Managers for the scheme, CCC were responsible for overseeing the production of all design deliverables associated with highways including drainage, structures, geotechnical and environmental elements. CCC were directly responsible for the highways and geometry design. As Designer’s Site Representative, CCC carried out site supervision during the construction of the works.

Notable Achievements

CCC in a Joint Venture with Fehily Timoney Ltd developed the tender design which formed the basis of Roadbridge’s successful tender.  During the detailed design phase of the project, CCC introduced a range of design initiatives that significantly reduced construction quantities and the associated carbon footprint of the scheme.  Of note was a 82km3 reduction in embankment volumes post-tender and the removal of 16.8km of piped drainage, which were typically replaced with Nature Based Drainage Solutions.