The Sundøy Bridge is a cantilever bridge in Leirfjord Municipality in Nordland county, Norway. The concrete bridge connects the mainland to the village of Sundøya on the island of Alsta. The 538 m bridge has three spans, with the main span being 298 m long. The maximum clearance to the sea is 43.5 m. The Sundøy Bridge was opened on 9 August 2003. It was designed by Jan-Eirik Nilsskog. The bridge cost NOK150 million. The decision to spend such an amount of money on a bridge to a place with less than 150 inhabitants was disputed. However, Sundøya did not get connected to the mainland when the rest of Alsta did, following the opening of the Helgeland Bridge in 1991. This was because Seven Sisters mountains separate the two sides of the island with no roads crossing them. Consequently, the people at Sundøya thought it was only fair that they got their connection as well.