PROJECT PROFILE WJE www.wje.com Lake Street Bascule Bridge Structural Evaluation | Chicago, IL CLIENT HNTB Corporation and Chicago Department of Transportation BACKGROUND The Lake Street Bridge is a double- deck bascule bridge that was constructed circa 1914. The bridge supports two lanes of traffic on its lower level and two CTA tracks on its upper level. The bridge superstructure is composed of two bridge “leafs” that cantilever from the bridge substructures on each side of the river. Each leaf is composed of two identical main trusses that support transverse beams that carry the roadway and track loading. The bridge substructures consist of a cast-in- place

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