Coastal Highway (84 km)
Engineering Design — Liberia Coastal Highway (Detailed Design)
Ministry of Public Works — Liberia
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Year
2016
Client
Ministry of Public Works, Liberia
Funding
European Union
Length
~180 km
Year
2017
Objectives & Context
Following the ESIA approval for the Liberia Coastal Highway, the project advanced to detailed engineering design. The 180 km coastal route presented complex engineering challenges: the alignment traverses coastal mangrove zones requiring elevated embankments and specialised drainage, multiple major river crossings requiring long-span bridge structures, areas of poor bearing capacity requiring ground improvement, and sections of coastal erosion risk requiring protective revetment design. Designing infrastructure that would be resilient to anticipated sea level rise and increased storm frequency under climate change scenarios added a further dimension.
Our Approach & Solution
TSC Global led the detailed engineering design, bringing together road and pavement engineers, bridge structural engineers, geotechnical specialists, coastal engineers, and hydraulic modellers. The design process included LiDAR topographic survey of the full corridor, geotechnical investigation at bridge sites and areas of poor ground, hydraulic modelling for all major crossings, and coastal erosion risk assessment for exposed sections. Bridge designs ranged from standard reinforced concrete culverts to a 120-metre span structure at the St. Paul River crossing. Climate resilience was embedded in drainage sizing, embankment protection, and bridge freeboard specifications.
Results & Impact
Detailed design was completed and approved by the Ministry of Public Works and the EU delegation, advancing the project to tender-ready status. The design documentation — covering 1,800 drawings, specifications, and a detailed bill of quantities — provided the basis for competitive contractor procurement and formed the foundation for subsequent construction supervision activities.
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