CSO, feces, Illinois River From an announcement:
Rainfall in the City of Peoria has caused a sewer overflow into the Illinois River recently from one or more locations shown on the map located here.
When this warning is posted, please avoid full-body contact with the Illinois River in the area downstream from Detweiller Marina, as shown on [...]

From my inbox:
Your input is needed on the options for reducing sewer overflows to the Illinois River. The 30-day public comment period will close on Wednesday, August 20, but there is still time to make your opinion known.
If you were unable to attend the public meetings held August 6 and 7, the meeting handouts, presentation [...]

From the City of Peoria:
Rainfall in the City of Peoria has caused a sewer overflow into the Illinois River recently from one or more locations shown on the map located here.
When this warning is posted, please avoid full-body contact with the Illinois River in the area downstream from Detweiller Marina, as shown on the map. [...]