USGS Water Resources Division water quality site: 05586100 Site description: Illinois River at Valley City, IL Hydrologic Unit Code (HUC): 07130011 Site UTM N: 4397272 Site UTM E: 701881 UTM zone: 15 Drainage area at water quality site: 26,744 mi2 Sampling frequency: monthly Flow station: 05586100 (USGS daily flows) Station description: Illinois River at Valley City, IL Hydrologic Unit Code (HUC): 07130011 Station UTM N: 4397272 Station UTM E: 701881 UTM zone: 15 Drainage area at flow station: 26,744 mi2 Period of record: 10/01/1938-09/30/1997 Flow conversion: none The following constituent values were removed from analysis as possible outliers, or are below detection limits: none Additional comments: none Loads for this site were estimated with LOADEST2 version 1.101