I've brought this up before on other forums and was shocked at the number of "fisherman" who were vocally against Chicago cleaning up their water discharge. The Cal Sag and Chicago River dump in the DPR so that is why it is important for those who fish the lower DPR.
Sometime in the summer take a ride down to the three rivers area where the DPR and K3 meet to form the Illinois, spend some time on the DPR, then spend some time on the K3 - your nose will tell the tale.
fyi - Chicago is responsible for around 20% of all Nitrogen and Phosphorus in Mississippi watershed - yes agriculture provides the bulk, but that is spread out over an area that stretches from South Dakota to Ohio.. /rant
This is great news, baffling that their was such great resistance, but great news none the less