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Great Northern Rail road draw bridge next to Chittenden Locks and Carl English Botanical Gardens. Salmon Bay Waterway, Bridge No. 4 was designed by The Strauss Bascule Bridge Co. of Chicago Illinois in 1912. <br />
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Construction of the structure referred to as a "Strauss Heel-trunnion Bascule Bridge type" on GN blueprints began in 1913 by the Fort Pitt Bridge Works of Pittsburgh, Pennsylvania for the Great Northern Railway. The Bascule designed drawbridge provided a vital link for The Great Northern Railway's Cascade Division, thus connecting Seattle's gateway with Canada to the North and St. Paul to the East. GN records describe the railroad's requirements: "To secure double track on improved alignment, free from grade crossing and to comply with requirements of the U.S. engineers at the crossing of Salmon Bay Waterway, the level of which is to be raised in connection with the Lake Washington Ship Canal."