Waterside Footbridge, Coleraine

Doran Consulting was commissioned by the Northern Division of the Roads Service to design and supervise the construction of a new Millennium Cycle and Pedestrian Bridge in Coleraine, Co Londonderry. A post-tender partnering agreement was adopted for the construction phase of the contract.

The new bridge is situated some 5m downstream of the existing 3-span, stone, masonry arch road bridge across the Lower Bann in Coleraine town centre. It provides improved pedestrian and cycle access across the river and forms an important link in the National Cycle Network.

The new bridge is a 69m long 3-span steel arch structure designed to compliment the profile of the adjacent three span stone masonry arch bridge. Each span comprises a pair of out of plane tubular steel circular arches, supporting a steel deck, comprising longitudinal and transverse hollow section members and an 8mm deck plate. The bridge is supported on in situ reinforced concrete abutments and river piers. The two river piers are each supported on a single reinforced concrete 1.8m diameter mono pile, constructed within a permanent steel casing, driven 2m into the bedrock. The abutments are supported on a combination of vertical and raking driven pre-cast concrete piles.