USGS Water-Year Summary for Site 05538020

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00095 Specific cond at 25C(Max.,Min.,Mean)
	00300 Dissolved oxygen(Max.,Min.,Mean)
	00400 pH(Max.,Min.,Med.)
	32318 Chlorophylls,in situ(Mean,Max.,Min.)
	32319 fPC, water, in situ(Min.,Max.,Mean)
	63680 Turbidity, Form Neph(Mean,Min.,Max.)
	72240 CO2 at water surface(Max.,Min.,Mean)

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Water year 2024: 2024-10-01 to 2025-09-30

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USGS Water-Year Summary 2024

05538020 DES PLAINES RIVER IN LOCK CHANNEL AT ROCKDALE, IL

LOCATION - Lat 41°30'00", long 88°06'25" referenced to North American Datum of 1983, in NE 1/4 NW 1/4 SE 1/4 sec.20, T.35 N., R.10 E., Will County, IL, Hydrologic Unit 07120004,

REVISIONS HISTORY -
Revisions: Chlorophyll data for the period Feb. 19, 2016, to Jan. 12, 2022, was revised on Apr. 6, 2022 because data had been published using the incorrect parameter code. The values did not change only the parameter code was updated.

SURFACE-WATER RECORDS

PERIOD OF RECORD -

SURFACE-WATER QUALITY:
WATER TEMPERATURE: August 2015 to current.
SPECIFIC CONDUCTANCE: August 2015 to current.
PH: August 2015 to current.
DISSOLVED OXYGEN: August 2015 to current.
TURBIDITY: August 2015 to current.
DISSOLVED CARBON DIOXIDE: August 2015 to current.
CHLOROPHYLL-A: February 2016 to current.
PHYCOCYANIN: October 2021 to current.

GAGE - Water-stage recorder and water-quality monitor. Datum of gage is 0.43 ft below North American Vertical Datum of 1988. Gage height minus 0.43 ft equals NAVD88 elevation.

REMARKS - Accuracy of records is discussed in the annual Station Analysis archived at the USGS IL Water Science Center.

EXTREMES FOR PERIOD OF RECORD -
WATER TEMPERATURE: Maximum, 30.0 oC, Aug. 11, 2016; minimum 0.28 oC, Jan. 8, 2018.
SPECIFIC CONDUCTANCE: Maximum, 3396 us/cm, Feb. 8, 2021; minimum 395 us/cm, Sept. 27, 2019.
PH: Maximum, 8.63, Aug. 24, 2023; minimum 6.7, May 31, June 1, 2016, and July 15, 2017.
DISSOLVED OXYGEN: Maximum, 18.86 mg/L, July 23, 2023; minimum 3.3 mg/L, June 1 and 15, 2016.
TURBIDITY: Maximum, 134 FNU, Jan. 29, 2018; minimum 0.6 FNU, May 23, 2021.
DISSOLVED CARBON DIOXIDE: Maximum, 1.55%, July 28, 2021; minimum 0.01%, Aug. 24, 2023.
CHLOROPHYLL-A: Maximum, 59.9 ug/L, Aug. 2, 2019; minimum, 0.07 ug/L, March 06, 2016.
PHYCOCYANIN: Maximum: 2.55 ug/L, July 26, 2023; minimum: 0.0, multiple days in 2022 and 2023.