Water Year 2010 (Oct. 2009 - Sep. 2010)
October, 2009 November, 2009 December, 2009 January, 2010 February, 2010 March, 2010
| | April, 2010 May, 2010 June, 2010 July, 2010 August, 2010 September, 2010
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Water Year 2009 (Oct. 2008 - Sep. 2009)
October, 2008 November, 2008 December, 2008 January, 2009 February, 2009 March, 2009
| | April, 2009 May, 2009 June, 2009 July, 2009 August, 2009 September, 2009
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Rivers and streams are a vital water resource of the state. This site shows provisional, monthly mean flow data for 26 US Geological Survey gaging stations on rivers and streams throughout Illinois. Values reported do not reflect final or official discharges. Provisional data are provided for the month just ending and the preceding water year so that flows at these stations can be compared to flows in the past year. Streamflow varies seasonally, with highest flows typical of spring and lowest flows occurring in the late summer and fall. Long-term average monthly flows and other statistics computed from historical records are given for each calendar month to provide a climatological context for comparison. |