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Streamflow Maps
These maps display 14-day average streamflow percentiles for selected USGS stations throughout Illinois. The percentage values on the maps describe
the average streamflow for the preceding 14-day period, as compared to that same period for all years of record. For example, a value of 20 indicates
that 20% of the years on record experienced a lower total flow amount than the current year.
June 21 - July 4 Average Streamflow Percentiles
The percentage values on this map describe Illinois streamflows
for June 21 - July 4, as compared to the same 14-day
period for all years of record at selected USGS gaging stations.
The streamflow data used to produce this map are provisional and
may be subject to change.
Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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April 26 - May 23 Average Streamflow Percentiles
The percentage values on this map describe Illinois streamflows
for April 26 - May 23, as compared to the same 14-day
period for all years of record at selected USGS gaging stations.
The streamflow data used to produce this map are provisional and
may be subject to change.
Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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April 12 - April 25 Average Streamflow Percentiles
The percentage values on this map describe Illinois streamflows
for April 12 - April 25, as compared to the same 14-day
period for all years of record at selected USGS gaging stations.
The streamflow data used to produce this map are provisional and
may be subject to change.
Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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March 29 - April 11 Average Streamflow Percentiles
The percentage values on this map describe Illinois streamflows
for March 29 - April 11, as compared to the same 14-day
period for all years of record at selected USGS gaging stations.
The streamflow data used to produce this map are provisional and
may be subject to change.
Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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March 14 - March 28 Average Streamflow Percentiles
The percentage values on this map describe Illinois streamflows
for March 14 - March 28, as compared to the same 14-day
period for all years of record at selected USGS gaging stations.
The streamflow data used to produce this map are provisional and
may be subject to change.
Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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March 1 - March 14 Average Streamflow Percentiles
The percentage values on this map describe Illinois streamflows
for March 1 - March 14, as compared to the same 14-day
period for all years of record at selected USGS gaging stations.
The streamflow data used to produce this map are provisional and
may be subject to change.
Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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February 14 - February 28 Average Streamflow Percentiles
The percentage values on this map describe Illinois streamflows
for February 14 - February 28, as compared to the same 14-day
period for all years of record at selected USGS gaging stations.
The streamflow data used to produce this map are provisional and
may be subject to change.
Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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February 1 - February 14 Average Streamflow Percentiles
The percentage values on this map describe Illinois streamflows
for February 1 - February 14, as compared to the same 14-day
period for all years of record at selected USGS gaging stations.
The streamflow data used to produce this map are provisional and
may be subject to change.
Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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January 18 - January 31 Average Streamflow Percentiles
The percentage values on this map describe Illinois streamflows
for January 18 - January 31, as compared to the same 14-day
period for all years of record at selected USGS gaging stations.
The streamflow data used to produce this map are provisional and
may be subject to change.
Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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January 4 - January 17 Average Streamflow Percentiles
The percentage values on this map describe Illinois streamflows
for January 4 - January 17, as compared to the same 14-day
period for all years of record at selected USGS gaging stations.
The streamflow data used to produce this map are provisional and
may be subject to change.
Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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December 21 - January 3 Average Streamflow Percentiles
The percentage values on this map describe Illinois streamflows
for December 21 - January 3, as compared to the same 14-day
period for all years of record at selected USGS gaging stations.
The streamflow data used to produce this map are provisional and
may be subject to change.
Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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December 7 - December 20 Average Streamflow Percentiles
The percentage values on this map describe Illinois streamflows
for December 7 - December 20, as compared to the same 14-day
period for all years of record at selected USGS gaging stations.
The streamflow data used to produce this map are provisional and
may be subject to change.
Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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November 23 - December 6 Average Streamflow Percentiles
The percentage values on this map describe Illinois streamflows
for November 23 - December 6, as compared to the same 14-day
period for all years of record at selected USGS gaging stations.
The streamflow data used to produce this map are provisional and
may be subject to change.
Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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November 16 - November 29 Average Streamflow Percentiles
The percentage values on this map describe Illinois streamflows
for November 16 - November 29, as compared to the same 14-day
period for all years of record at selected USGS gaging stations.
The streamflow data used to produce this map are provisional and
may be subject to change.
Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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November 9 - November 22 Average Streamflow Percentiles
The percentage values on this map describe Illinois streamflows
for November 9 - November 22, as compared to the same 14-day
period for all years of record at selected USGS gaging stations.
The streamflow data used to produce this map are provisional and
may be subject to change.
Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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November 2 - November 15 Average Streamflow Percentiles
The percentage values on this map describe Illinois streamflows
for November 2 - November 15, as compared to the same 14-day
period for all years of record at selected USGS gaging stations.
The streamflow data used to produce this map are provisional and
may be subject to change.
Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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October 26 - November 8 Average Streamflow Percentiles
The percentage values on this map describe Illinois streamflows
for October 26 - November 8, as compared to the same 14-day
period for all years of record at selected USGS gaging stations.
The streamflow data used to produce this map are provisional and
may be subject to change.
Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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October 19 - November 1 Average Streamflow Percentiles
The percentage values on this map describe Illinois streamflows
for October 19 - November 1, as compared to the same 14-day
period for all years of record at selected USGS gaging stations.
The streamflow data used to produce this map are provisional and
may be subject to change.
Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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October 12 - October 25 Average Streamflow Percentiles
The percentage values on this map describe Illinois streamflows
for October 12 - October 25, as compared to the same 14-day
period for all years of record at selected USGS gaging stations.
The streamflow data used to produce this map are provisional and
may be subject to change.
Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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October 5 - October 18 Average Streamflow Percentiles
The percentage values on this map describe Illinois streamflows
for October 5 - October 18, as compared to the same 14-day
period for all years of record at selected USGS gaging stations.
The streamflow data used to produce this map are provisional and
may be subject to change.
Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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September 28 - October 11 Average Streamflow Percentiles
The percentage values on this map describe Illinois streamflows
for September 28 - October 11, as compared to the same 14-day
period for all years of record at selected USGS gaging stations.
The streamflow data used to produce this map are provisional and
may be subject to change.
Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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September 21 - October 4 Average Streamflow Percentiles
The percentage values on this map describe Illinois streamflows
for September 21 - October 4, as compared to the same 14-day
period for all years of record at selected USGS gaging stations.
The streamflow data used to produce this map are provisional and
may be subject to change.
Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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September 14 - September 27 Average Streamflow Percentiles
The percentage values on this map describe Illinois streamflows
for September 14 - September 27, as compared to the same 14-day
period for all years of record at selected USGS gaging stations.
The streamflow data used to produce this map are provisional and
may be subject to change.
Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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September 7 - September 20 Average Streamflow Percentiles
The percentage values on this map describe Illinois streamflows
for September 7 - September 20, as compared to the same 14-day
period for all years of record at selected USGS gaging stations.
The streamflow data used to produce this map are provisional and
may be subject to change.
Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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August 30 - September 13 Average Streamflow Percentiles
The percentage values on this map describe Illinois streamflows
for August 30 - September 13, 2005, as compared to the same 14-day
period for all years of record at selected USGS gaging stations.
The streamflow data used to produce this map are provisional and
may be subject to change.
Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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August 24 - September 6 Average Streamflow Percentiles
The percentage values on this map describe Illinois streamflows
for August 24 - September 6, 2005, as compared to the same 14-day
period for all years of record at selected USGS gaging stations.
The streamflow data used to produce this map are provisional and
may be subject to change.
Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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August 17 - August 30 Average Streamflow Percentiles
The percentage values on this map describe Illinois streamflows
for August 17 - August 30, 2005, as compared to the same 14-day
period for all years of record at selected USGS gaging stations.
The streamflow data used to produce this map are provisional and
may be subject to change.
Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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August 10 - August 23 Average Streamflow Percentiles
The percentage values on this map describe Illinois streamflows
for August 10 - August 23, 2005, as compared to the same 14-day
period for all years of record at selected USGS gaging stations.
The streamflow data used to produce this map are provisional and
may be subject to change.
Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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August 3 - August 16 Average Streamflow Percentiles
The percentage values on this map describe Illinois streamflows
for August 3 - August 16, 2005, as compared to the same 14-day
period for all years of record at selected USGS gaging stations.
The streamflow data used to produce this map are provisional and
may be subject to change.
Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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July 27 - August 9 Average Streamflow Percentiles
The percentage values on this map describe Illinois streamflows
for July 27 - August 9, 2005, as compared to the same 14-day period
for all years of record at selected USGS gaging stations.
The streamflow data used to produce this map are provisional and
may be subject to change.
Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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July 20 - August 2 Average Streamflow PercentilesThe percentage values on this map describe
Illinois streamflows for July 20-August 2, 2005, as compared to the same 14-day period for all years of record at selected USGS gaging stations. The streamflow data used to produce
this map are provisional and may be subject to change. Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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July 14 - July 27 Average Streamflow PercentilesThe percentage values on this map describe
Illinois streamflows for July 14-July 27, 2005, as compared to the same 14-day period for all years of record at selected USGS gaging stations. The streamflow data used to produce
this map are provisional and may be subject to change. Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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July 7 - July 20 Average Streamflow PercentilesThe percentage values on this map describe
Illinois streamflows for July 7-July 20, 2005, as compared to the same 14-day period for all years of record at selected USGS gaging stations. The streamflow data used to produce
this map are provisional and may be subject to change. Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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June 30 - July 13 Average Streamflow PercentilesThe percentage values on this map describe
Illinois streamflows for June 30-July 13, 2005, as compared to the same 14-day period for all years of record at selected USGS gaging stations. The streamflow data used to produce
this map are provisional and may be subject to change. Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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June 23 - July 6 Average Streamflow PercentilesThe percentage values on this map describe
Illinois streamflows for June 23-July 6, 2005, as compared to the same 14-day period for all years of record at selected USGS gaging stations. The streamflow data used to produce
this map are provisional and may be subject to change. Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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June 16 - June 29 Average Streamflow PercentilesThe percentage values on this map describe
Illinois streamflows for June 16-June 29, 2005, as compared to the same 14-day period for all years of record at selected USGS gaging stations. The streamflow data used to produce
this map are provisional and may be subject to change. Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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June 9 - June 22 Average Streamflow PercentilesThe percentage values on this map describe
Illinois streamflows for June 9-June 22, 2005, as compared to the same 14-day period for all years of record at selected USGS gaging stations. The streamflow data used to produce
this map are provisional and may be subject to change. Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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May 27 - June 9 Average Streamflow PercentilesThe percentage values on this map describe
Illinois streamflows for May 27-June 9, 2005, as compared to the same 14-day period for all years of record at selected USGS gaging stations. The streamflow data used to produce this
map are provisional and may be subject to change. Maps are available in lo res (100k)
and hi res (150k) formats for viewing.
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Last Modified: July 06, 2006
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