I wrote askalibrarian@cpl.org about this whole Hering situation. They got back to me within a few hours. They have a bunch of documentation that says Hering conceived the Ship & Sanitary Canal plan in 1887. In 1889 the Chicago Municipal Sanitary District was formed, with Isham Randolph as their Chief Engineer.
From 1883 until 1886 Hering was working Philadelphia on their sewer system. In 1889 he was in New York doing the same. According to this US Army PDF, Hering was responsible for most the United States early sewers.
I’m going to go to the Harold Washington Library this week to look at some of their archives on the building of the canal. The Chicago Public Library is really impressing me today.
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