📷 A tunnel shaft and workers on Prairie Avenue just north of 116th Street in Chicago during construction for a section of the Calumet Intercepting Sewer system on December 12, 1916.
📣 Join our 2 p.m. virtual tour TODAY (June 16) ⬇️
https://mwrd.org/education/tours/virtual-tours
Metropolitan Water Reclamation District of Greater Chicago
