Overview website: http://ilrdss.isws.illinois.edu/fox/
The data is at Box share, gltg-source-data/Fox River Watershed Database
Information about the database including schema: http://ilrdss.sws.uiuc.edu/fox/fox_report_phase1.asp?ws=3
Presentation at Nutrient Monitoring Council that explains what kinds of query Jong Lee did to extract the data from the database.