Knowing what we know now, that the wastewater treatment facility in Chicago (at least the major one) dumps its treated water into the Chicago River, we zoomed in on this part of the Chicago River...
We really looked at this area and came up with some great questions:
We agreed that we really need to know where the water flows, so our next steps involve figuring out that. IF the Chicago River flows into Lake Michigan, then we've got some problems on our hands...