The control panel for the Great Northern Salmon Bay Bridge at Seattle, Washington, undated. Photo by Bill Sornsin.

Great Northern Railway bridge at Ballard, Washington. Bridge 4 over Salmon Bay Waterway. Other subject classes: Bridge

Northern Pacific bascule bridge open over the Lake Washington Ship Canal at Seattle, Washington, circa 1928. This bridge at Fremont was east of the Great Northern bridge at Ballard. Photo by J.A. Turner. Other Subject Classes: bascule bridge, landscape

Northern Pacific bascule bridge over Lake Washington Ship Canal between Fremont and Ballard in Seattle, Washington, circa 1928. Approach to Fremont bridge is at lower right; NP bridge is down the canal at left. Photo by J.A. Turner. Other Subject Classes: bascule bridge, landscape

A train at the Northern Pacific bascule bridge over the Lake Washington Ship Canal at Seattle, Washington, circa 1946. The view is looking southwest from Fremont at Interbay and the Magnolia ridge. Photo by J.A. Turner. Other Subject Classes: bascule bridge, landscape