Webuild Celebrates Completion of ‘Epochal’ Bridge in the Highlands of Lesotho

Why It Matters

The bridge guarantees vital road access once the Polihali reservoir fills, safeguarding the water‑and‑energy corridor that underpins Lesotho’s economic growth and regional water security.

Key Takeaways

• 825‑meter Senqu Bridge spans future Polihali Dam reservoir.
• 90‑meter height makes it the region’s highest bridge.
• First extradosed bridge in southern Africa, combining cable‑stayed and girder design.
• Joint venture includes Webuild, Enza, Raubex, and Sigma Construction.
• Bridge secures A1 road link for communities after reservoir fills.

Pulse Analysis

The Senqu Bridge represents a technical milestone for southern Africa’s infrastructure landscape. Built by an international joint venture led by Italy’s Webuild, the 825‑meter crossing required innovative engineering solutions, including 88‑meter work platforms and rock‑carved access roads to navigate the steep Drakenberg Mountains. Its extradosed configuration—melding cable‑stayed and girder technologies—offers the stiffness needed to resist the region’s high winds while reducing material costs compared with a full cable‑stayed span.

Beyond its engineering feats, the bridge is a linchpin of the Lesotho Highlands Water Project, a bilateral initiative between Lesotho and South Africa that channels water from the highlands to the Vaal River basin. By preserving the A1 trunk road, the structure ensures uninterrupted transport for local communities and maintains the logistical flow essential for dam construction, operation, and downstream water delivery. The project bolsters Lesotho’s revenue stream from water sales, supports regional energy generation, and stimulates ancillary economic activity in remote highland areas.

Webuild’s successful delivery reinforces its reputation for tackling complex, high‑altitude projects across emerging markets. The collaboration with local firms Enza, Raubex, and Sigma not only transferred expertise but also cultivated a skilled workforce capable of sustaining future infrastructure endeavors. As Africa intensifies its focus on water security and connectivity, the Senqu Bridge serves as a template for integrating advanced bridge typologies into challenging terrains, highlighting the strategic role of infrastructure in unlocking economic potential across the continent.