MWRD: 1920-1931 Des Plaines River Sewage Treatment Works (WRP)

(Satellite, an experimental plant that no longer exists)

MWRD posted on Feb 5, 2023
Construction of the Des Plaines River Sewage Treatment Works on August 20, 1920. This early treatment plant built by the Sanitary District of Chicago (now MWRD) was located southeast of Roosevelt Road and 1st Avenue in Forest Park, Illinois. Operating until 1931, the plant served as a testing location for various treatment processes. Once the nearby Salt Creek intercepting sewer was placed in service, the flow was then conveyed to the West Side Plant, which is now the Stickney Water Reclamation Plant.
Village of Forest Park     US Postal Service
Bob Burns: There's an interesting story about how those planes would find their way across the US back before GPS was a thing:
https://www.snopes.com/fact-check/mysterious-arrows/
You can still see one south of Rockford.
 https://www.google.com/.../data=!3m1!1e3!4m5!3m4!1s0x0...

MWRD posted on Mar 26, 2023
Workers rolling and seeding the grounds of the Des Plaines River Sewage Treatment Works on May 21, 1924. 

MWRD posted
A view of the Des Plaines River Treatment Works facility grounds, viewed to the west from the roof of one of the buildings on September 24, 1924.

Another early WRP: (Update: I now think this is the same WRP.)

MWRD posted
Construction of an early wastewater treatment plant in Maywood on September 28, 1921.
Dennis DeBruler: I'm aware of the early Des Plaines River Treatment Works. Where was this one located, and when was it closed?

Looking at a map, Maywood is just across the intersection from the 1920 plant, so I now assume that this is the same plant.

MWRD posted
Construction of an early wastewater treatment plant in Maywood on May 4, 1922.