Daily mean discharge graphs for 3 U.S. Geological Survey streamflow-gaging stations
in the northern, central, and southern parts of the State of Illinois are presented here. The
graphs represent 1 year of data from today's date. Graphs are updated daily.
Daily mean discharge for the 1-year time period is compared with the percentile distribution of mean
daily discharges for the 30-year period, 1961-90. Daily mean discharge is in the deficient-flow
range if its value is less than or equal to the 25th percentile, in the normal-flow range
if its value is between 25th and 75th percentiles, and in the excessive-flow range if its value
is equal to or greater than the 75th percentile.
Pecatonica River at Freeport (USGS 05435500) is located in Stephenson County
in northern Illinois and has a drainage area of approximately 1,326 square miles.
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Sangamon River at Monticello (USGS 05572000) is located in Piatt County in
central Illinois and has a drainage area of approximately 550 square miles.
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Skillet Fork at Wayne City (USGS 03380500) is located in Wayne County in
southern Illinois and has a drainage area of approximately 464 square miles.
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