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Skansen is a historic area in the city of Trondheim in central Norway and home to the Skansen Bridge, a 52m span bascule railway bridge that opens for marine traffic to access the Trondheim Fjord. The Skansen Bridge was built in 1918 and designed by structural engineer Joseph Strauss, who also designed the Golden Gate Bridge in San Francisco. The displacement of rocks and other objects in shallow waters over time can result in structural integrity issues for bridge piers such as the Skansen Bridge and hazards for vessel traffic, so that regular inspection of the structural integrity is required to ensure safe navigation.