Illinois Provisional Monthly Flows
| Water Year 2013 (Oct. 2012 - Sep. 2013) | |
|
October, 2012 November, 2012 December, 2012 January, 2013 February, 2013 March, 2013 | April, 2013 May, 2013 June, 2013 July, 2013 August, 2013 September, 2013 |
| Water Year 2012 (Oct. 2011 - Sep. 2012) | |
|
October, 2011 November, 2011 December, 2011 January, 2012 February, 2012 March, 2012 | April, 2012 May, 2012 June, 2012 July, 2012 August, 2012 September, 2012 |
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.