At the mouth of Taiwan’s Tamsui River, a new landmark has quietly redrawn the skyline. The Danjiang Bridge, designed by Zaha Hadid Architects, has opened as the world’s longest single-mast, asymmetric cable-stayed bridge — a record-breaking piece of infrastructure that manages to feel more like a gesture than an imposition on its surroundings.
The project stretches 920 meters between New Taipei City’s districts of Tamsui and Bali, held aloft by a single concrete mast rising 200 meters above the estuary. That restraint is intentional. Where most bridges of this scale rely on a sequence of towers or supports planted through the riverbed, ZHA stripped the structure down to one vertical element — tall and slim enough to leave the horizon largely intact. The main span reaches 450 meters to the west of the mast, with a 175-meter span to the east, and cables fan outward asymmetrically from the tower in a sweeping, almost calligraphic arrangement.
Designer:
The 71-meter-wide deck is built for a full range of movement. It carries motor traffic, dedicated pedestrian paths, cycle routes, and has been designed to accommodate a future extension of the Danhai Light Rail network — making it less a single-purpose crossing and more a layered piece of public infrastructure. ZHA director Patrik Schumacher described the design as one that would “make a conspicuous landmark against the backdrop of Tamsui’s famous sunsets,” and the placement of the mast against open water at dusk delivers exactly that.
Getting the form right required careful environmental modeling. The original competition brief placed significant weight on protecting views of the river’s famously photogenic sunsets, and ZHA used detailed mapping to ensure the mast’s silhouette — tall and linear — would read as a marker rather than a barrier in the landscape.
Engineering had to match Taiwan’s seismic reality. The support system is built to withstand earthquakes of magnitude 7 or above, combining pier supports, cable stays, hydraulic dampers, friction pendulum bearings, and synthetic rubber pads that work together to absorb both vertical and horizontal force. The structure is doing considerable technical work beneath its clean exterior.
ZHA won the Danjiang Bridge International Competition in 2015, and construction ran from that year through to 2025. For a firm whose identity is closely tied to cultural buildings and interior spaces, the bridge represents something different — a piece of civic infrastructure where the signature fluid language has been channeled into cable geometry, seismic engineering, and a view that already mattered deeply to the city it now connects.
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