The LaSalle Street Bridge: A Photographic Portfolio of a Bascule Bridge Lift. October, 2019.

During the spring and autumn in Chicago, boats are moved to and from the harbors along the Lakefront and either south or north along the Chicago River’s Main Branch and South Branch. Each bascule (from the French for seesaw) bridge lift take about 10 to 12 minutes depending on the numer of and organization of the boats in moving smoothly under the raised spans. These bridges are suited for the unique waterways of the river and the tall masts or instrumentation devices of the sailing craft.

Technical data for each photograph are in the captions for each one. The camera’s remarkable lens and sensor captured all the images from the south portion of the sidewalk near Upper North Wacker Drive while I barely moved a few yars west or east to gain better views of the bridge structure and design elements.

In the background, the Clark Street Bridge is still elevated as crews prepare for the lift of the LaSalle Street Bridge. An inspector walks across the barricaded south leaf. At this point the bridge is closed to vehicular and pedestrian crossings. Technical data: 30mm at 35mm equivalent, on which full-frame cameras are based.