Sunniberg Bridge, Road bridge in Klosters, Switzerland.

Sunniberg Bridge is a curved multi-span extradosed road bridge carrying the Klosters bypass road 28 across the Landquart valley. Four slender H-shaped concrete piers rise from the valley floor, their arms flaring outward to support a 12.4 m wide banked deck. The bridge spans 526 m on a horizontal curve of about 500 m radius, with the roadway reaching roughly 62 m above the Landquart at the second pier.

Construction started in spring 1996 and was completed in 1998, though the opening ceremony took place in 2005 alongside the Gotschna Tunnel. This project followed years of planning to better distribute traffic through the region.

The bridge became a new landmark of the municipality of Klosters. A plaque on the roadway barrier recalls the 2001 Outstanding Structure Award from the International Association for Bridge and Structural Engineering, given before the bridge opened to traffic. Prince Charles, a regular ski holidaymaker in Klosters, attended the 9 December 2005 opening of the bypass.

The structure is part of the Klosters bypass road and is used daily by drivers traveling between valleys. The best views of the bridge are from the valley floor, where you can fully appreciate its height and design.

The structure blends characteristics of beam and cable-stayed designs, featuring external cables with outward-flaring pylons positioned above the road edges. This hybrid engineering approach was a technical innovation when it was built.