USGS Water Resources Division Water Resources Division water quality site: 05446500 Site description: Rock River near Joslin, IL Hydrologic Unit Code (HUC): 07090005 Site UTM N: 4604517 Site UTM E: 735004 UTM zone: 15 Drainage area at water quality site: 9,549 mi2 Sampling frequency: monthly Flow station: 05446500 (USGS daily flows) Station description: Rock River near Joslin, IL Hydrologic Unit Code (HUC): 07090005 Station UTM N: 4604517 Station UTM E: 735004 UTM zone: 15 Drainage area at flow station: 9,549 mi2 Period of record: 10/01/1939-09/30/1997 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 1.10