Precipitation won't be much if a problem unless you're worried about too much. Weather Prediction Center has a large portion of IL in a 3-4"+ category. God part is it will fall over several days, but could see some flash flooding Monday with any severe weather that happens. Regardless, this time next week streams and rivers will be up
Link to graphic showing 7 day precipitation totals
http://www.hpc.ncep.noaa.gov/qpf/p168i.gif