» Lower Illinois River Basin NAWQA Areas covered include the Illinois River and tributaries from Ottawa, Illinois, to the confluence with the Mississippi at Grafton, Illinois. http://il.water.usgs.gov/proj/lirb/
» NWS-ILX Rivers and Hydrology Offers Advanced Hydrologic Prediction Services (AHPS) for Illinois river and river basin areas, including tabular, graphic and flood stage data. http://www.crh.noaa.gov/ahps2/index.php?wfo=ilx
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