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Water-Year Summary for Site 05533000

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
  • For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
  • For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
  • For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
  • Not all sites have reports available for every water year.
Available Parameters
00060 Discharge(Mean)  
00065 Gage height(Mean)  

Water year 2022: 2022-10-01 to 2023-09-30
 

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USGS Water-Year Summary 2022
05533000 FLAG CREEK NEAR WILLOW SPRINGS, IL
LOCATION - Lat 41°44'20", long 87°53'48" referenced to North American Datum of 1983, in NE 1/4 NE 1/4 SE 1/4 sec.31, T.38 N., R.12 E., Cook County, IL, Hydrologic Unit 07120004, on left bank at upstream side of bridge on German Church Road, 1.1 mi northwest of Willow Springs, and at mile 2.2.
DRAINAGE AREA - 16.5 mi².
REVISIONS HISTORY - WDR IL-75-1: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE
  DISCHARGE: July 1951 to current year.
  STAGE: Water years 1994 to current year.
SURFACE-WATER QUALITY
  MISCELLANEOUS: Water year 2000; contaminants in streambed sediments, water year 2000.
BIOLOGICAL
  ALGAE: Water year 2000.
  BENTHIC MACROINVERTEBRATES: Water year 2000.
  FISH: Water year 2001.
  HABITAT: Water year 2000-01.
GAGE - Water-stage recorder, phone telemeter, and crest-stage gage. Datum of gage is 606.36 ft above NGVD of 1929 (606.08 ft NAVD 1988). Prior to June 17, 1963, water-stage recorder at same site at datum 3.73 ft higher. However, datum incorrectly published as 609.64 ft above NGVD of 1929 from 1951 to 1963. June 17, 1963, to June 26, 1964, nonrecording gage at site 0.5 mi upstream at datum 4.82 ft higher.
REMARKS - Effluent from sewage-treatment plant 2 mi. upstream averaged 20 ft³/s during the year. Accuracy of records is discussed in the annual Station Analysis archived at the USGS IL Water Science Center.
EXTREMES FOR PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 2,880 ft³/s, May 17, 2020, gage height, 10.95ft; minimum daily, 0.1 ft³/s, Dec. 9, 1957.