May 11, 1937. The sun is shining through the access manhole above and through floor manholes i
May 11, 1937. The sun is shining through the access manhole above and through floor manholes into the gate chamber. Access to the backwater gates on West Town’s outlet sewer section 3 is through the operating gallery above the gate chamber. (Metropolitan Water Reclamation District of Greater Chicago Archives) -- source link
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