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Brattørbrua is an unusual retractable road bridge in Trondheim, Norway, crossing Gryta canal harbour . The canal branches off the River Nidelva close to the former Trondheim Mekaniske Verksted. 700m further west the canal is crossed by Skansen Bridge. 300m to the south, the Bakke Bridge (Trondheim) crosses the River Nidelva.
The bridge's two chain-hauled movable decks are supported by rollers. The bridge was built in 1880, rebuilt in 1938/39 and modified during WW2. In 2000, a new aluminium alloy deck was installed.
Old photo here.
See Wikipedia entry.
More information and location map here.