Science Fair Project Encyclopedia
The Ballard Bridge, also known as the 15th Avenue Bridge, is a double-leaf bascule bridge that carries 15th Avenue over Seattle's Salmon Bay between Ballard and Interbay. Built in 1917, it has an opening span of 66 meters (218 feet) and a total length of 870 meters (2,854) feet. It was added to the National Register of Historic Places in 1982.
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