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Water-Year Summary for Site 05586300

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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Available Parameters
00010 Temperature, water(Min.,Max.,Mean)  
00065 Gage height(Mean)  
00095 Specific cond at 25C(Min.,Max.,Mean)  
00300 Dissolved oxygen(Mean)  
00400 pH(Min.,Max.,Med.)  
32295 fDOM, water, in situ(Mean,Min.,Max.) [Discontinued March 3, 2020]  
32318 Chlorophylls,in situ(Min.,Max.,Mean)  
32319 fPC, water, in situ(Min.,Max.,Mean)  
51289 OrthoPO4, in situ(Max.,Min.,Mean)  
51289 OrthoPO4, in situ(Mean,Min.,Max.) [YSI]  
63680 Turbidity, Form Neph(Max.,Mean,Min.)  
63680 Turbidity, Form Neph(Max.,Min.,Mean)  
80154 Suspnd sedmnt conc(Mean)  
80155 Suspnd sedmnt disch(Mean)  
91049 NO3+NO2, wu(Mean)  
99133 NO3+NO2,water,insitu(Max.,Min.,Mean)  

Water year 2024: 2024-10-01 to 2025-09-30
 
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USGS Water-Year Summary 2024
05586300 ILLINOIS RIVER AT FLORENCE, IL
LOCATION - Lat 39°37'57.9", long 90°36'27.6" referenced to North American Datum of 1983, in NE 1/4 SE 1/4 NW 1/4 sec.25, T.14 N., R.14 W., Pike County, IL, Hydrologic Unit 07130011, on right upstream bridge-protection cell of Route 100/106 bridge, 0.3 miles east of Township Road 3982E, 0.3 miles north of Florence, 3 miles southwest of Bloomfield, 29.7 miles downstream from La Moine River, and mile 53.8.
DRAINAGE AREA - 26,870 mi². does not include diversion from Lake Michigan through the Chicago Sanitary and Ship Canal, which has occurred since Jan. 17, 1900.
REVISIONS HISTORY - Revisions: Gage datum was updated to 404.46 ft NAVD88 on June 6, 2023, based on a GNSS Level II survey using GEOID18.
SURFACE-WATER RECORDS
PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE
  STAGE: May 2012 to current.
SURFACE WATER QUALITY
  SEDIMENT: February 1980 to current (Prior to October 2011, published as at Valley City).
  WATER TEMPERATURE: June 2012 to current.
  SPECIFIC CONDUCTANCE: June 2012 to current.
  DISSOLVED OXYGEN: June 2012 to current.
  PH: June 2012 to current.
  TURBIDITY: June 2012 to current.
  CHLOROPHYLL: Mar. 31, 2014, to current.
  PHYCOCYANIN: Mar. 31, 2014, to current.
  DISSOLVED ORGANIC MATTER: Nov. 12, 2015, to current.
  NITRATE: June 2012 to current.
  PHOSPHATE: April 2013 to current.
GAGE - Water-stage recorder, cell phone telemetry, automatic water sampler, water-quality monitor, and a crest-stage gage. Datum of gage is 404.46 ft above NAVD of 1988.
REMARKS -

Water discharge used to compute sediment record are from Illinois River at Valley City (station 05586100).

Occasional regulation at low flow by navigation dam at La Grange.

Since Jan. 17, 1900, flow has included diversion from Lake Michigan through Chicago Sanitary and Ship Canal.

Suspended-sediment samples were collected by local observers generally twice weekly with additional samples collected during high runoff periods. Since February 1994, samples used to compute sediment record have been collected at upstream side Rt. 106 bridge at Florence at mile 53.8.

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 STAGE: Maximum gage height, 39.17 ft, June 4, 2019; minimum, 14.04 ft, Oct. 12, 2012.
SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum daily, 3,720 mg/L, Apr. 14, 1981 (at Valley City); minimum daily, 13 mg/L, Nov. 14-15, 2007 (at Valley City).
SUSPENDED-SEDIMENT LOADS: Maximum daily, 410,000 tons, June 4, 1980 (at Valley City); minimum daily, 172 tons, Sept. 2, 1984 (at Valley City).
WATER TEMPERATURE: Maximum, 32.8oC, July 7, 2012; minimum, -0.1 oC, many days during 2014.
SPECIFIC CONDUCTANCE: Maximum, 1,310 uS/cm at 25oC, Feb. 17-19, 2014; minimum, 351 uS/cm at 25oC, Feb. 25, 2014.
DISSOLVED OXYGEN: Maximum, 15.3 mg/L, Jan. 24, 2013; minimum, 2.0 mg/L, Sept. 16, 2013.
PH: Maximum, 8.8 standard units, Aug. 23, 2013 and Feb. 28, 2017; minimum, 7.1 standard units, June 11, 2015.
TURBIDITY: Maximum, 2070 FNU, May 27-28, 2013; minimum, 2.7 FNU, Sept. 4, 2017.
CHLOROPHYLL: Maximum, 80.4 ug/L, March 18 2021, minimum, 0.0 ug/L, Sept. 5, 2017.
PHYCOCYANIN: Maximum, 3.51 ug/L, May 12, 2014, minimum, 0.35 ug/L, June 28-30, 2015.
DISSOLVED ORGANIC MATTER: Maximum, 71.8 ug/L QSE, Aug. 29, 2017, minimum, 0.3 ug/L QSE, June 10, 2015.
NITRATE: Maximum, 8.53 mg/L, Apr. 16, 2013; minimum, 0.84 mg/L, Sept. 12, 2013.
PHOSPHATE: Maximum, 0.724 mg/L, Mar. 17-18, 2015; minimum, 0.001 mg/L, Dec. 2, 2015.