Leeds City Council / Environment Agency

River Aire, Stourton, Leeds

Designer: Mott MacDonald
Architect: Knight Architects
Structural Engineer: Mott MacDonald
Clients Technical Advisor: Arup
Main Contractor: BAM Nuttall

Knostrop Flood Alleviation Scheme Footbridge, Leeds

Following significant flooding in Leeds in December 2015 the implementation of the Leeds Flood Alleviation Scheme (FAS) has been carried out by Leeds City Council and the Environment Agency. Split into two phases with the PHASE 1 £50M civil engineering package being awarded to a BAM Nuttall Mott MacDonald Joint Venture (BMMJV) with work beginning in January 2015.

A major part of the works was the installation new state-of-the -art movable weirs, the first time such a system has been used in the UK. To provide access across the new weir a new bridge has been designed by Knight Architects which was manufactured and installed by SH Structures. The new bridge now provides access for pedestrians and cyclists linking the Trans Pennine Trail with the city.

The bridge features an elegant slim profile with a curved underside supported on slender piers which are only 50mm thick. The 70m span bridge was fully assembled in SH Structures facility which is situated just miles from the Knostrop site. Upon completion the assembly was split into four individual deck sections which were then transported to site for installation.

The bridge supports were installed in June 2017 and the four deck units were installed during July.

To minimise the work to be carried out over the river the deck units were installed with their stainless-steel balustrade system in place.

The installation of the bridge was carried out using a 500te capacity crawler crane which was situated on temporary stone causeway in the river.