Board of Local Improvements : City of Chicago (1921)
Chicago (Ill.). Board of Local Improvements, Faherty, M. J · [Chicago : Board of Local Improvements · leaf 20
Largest double deck bascule bridge in the world; to construct it required 3,500 tons of steel; 3,200 tons of counterweight; 500 tons of machinery and four 100 H. P. motors to operate this bridge. \6 … Michigan Avenue Bridge; east lower level roadway, looking north; which isused for heavy traffic.
Public works · City planning
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