Stolma Bridge

The Stolma Bridge (Stolmabrua) is a road bridge over the Stolmasundet strait in Austevoll municipality, Vestland county, Norway. It connects the islands of Stolmen and Selbjørn. The bridge is 467 m long and has three spans, the largest of which is 301 m. The construction cost was US$15.3 million. The bridge was opened for traffic 14 November 1998 and is part of County Road 5138. The main span was the world's longest cantilever box-girder span until it was surpassed by the Shibanpo Second Yangtze River Bridge in China.

Bridge design
The bridge is a cantilevered prestressed concrete box girder bridge using low density concrete, with a vertical clearance of 30 m. To achieve its record length for box girder construction, the hollow concrete box girders are 7 m wide and taper from 15 m inbox beam depth over the piers to 3.5 m in the center of the span. To reduce its weight, the center of the main span is constructed of high-strength low-density concrete with a density of 1940 kg/m3. The short end spans which cantilever the main span are ballasted with gravel.