Lagos Fourth Mainland Bridge Project, Nigeria

Rendel team has signed a collaborative agreement with AEC Lagos for the design development of the Lagos Fourth Mainland bridge project, estimated to cost in the region of €2 bn (₦844 billion).

The 38km long Fourth Mainland road bridge will cross the Lagos Lagoon, providing an important north-south traffic connection between Lagos Island and the towns of Lekki, Langbasa, Baiyeku and Itamagta. It will reduce Lagos congestion and relieve the strain on the existing 3rd Mainland bridge by providing an alternative route from Lekki to Ikorodu, and Ikeja to Ajah. The Lagos lagoon is a body of water which cuts across Great Lagos and is linked to the Atlantic Ocean. The terrain of the proposed bridge site is marshy lagoon topography.

The bridge in conjunction with existing road networks will establish a primary ring road around Lagos. This ring road will provide alternative traffic routes from Lekki to Ikorodu, Ikeja to Ajah, relieving the 3rd Mainland bridge of its overstretched capacity.

The main bridge across the lagoon is expected to be a post-tensioned balanced cantilever segmental box girder structure.

Rendel’s role as Deputy Project Leader will be to carry out a review of AEC’s designs of the main bridge structure as well as other bridge structures along the route. Rendel will also provide inputs into the advancement of the ‘specimen design’ to preliminary design phase. Rendel is expected to be retained for the downstream design development and international tendering phases as well.