USGS Water-Year Summary for Site 03612600

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	Available Parameters
	00010 Temperature, water(Mean)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(Mean)
	00300 Dissolved oxygen(Mean)
	63680 Turbidity, Form Neph(Mean)
	99133 NO3+NO2,water,insitu(Mean)

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

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USGS Water-Year Summary 2024

03612600 OHIO RIVER AT OLMSTED

LOCATION - Lat 37°10'45", long 89°03'30" referenced to North American Datum of 1927, Pulaski County, IL, Hydrologic Unit 05140206, 2.1 miles downstream from Dam 53, 1.0 mile east of Olmsted, 20.2 miles downstream from base gage at Metropolis.

DRAINAGE AREA - 203,000 mi².

REVISIONS HISTORY -

Datum of HEADWATER gage previously reported as 278.44 ft above NGVD of 1929. Datum was revised on Nov. 25, 2022.

Datum of TAILWATER gage previously reported as 270.34 ft above NGVD of 1929. Datum was revised on Nov. 25, 2022.

SURFACE-WATER RECORDS

PERIOD OF RECORD - 02/20/2013 to 07/15/2016 as 03612600 OHIO RIVER AT OLMSTED; 07/15/2016 to current as OHIO RIVER AT OLMSTED, IL

GAGE -

Water-stage recorder and velocimeter.

HEADWATER GAGE

Datum is 278.13 feet above NAVD of 1988, 277.81 ft above NGVD of 1929, and 279.0 above Ohio River Datum (COE 1912).

TAILWATER GAGE

Datum is 270.00 feet above NAVD of 1988, 269.68 ft above NGVD of 1929, and 270.9 above Ohio River Datum (COE 1912).

COOPERATION - U.S. Army Corps of Engineers, Louisville District and National Stream Quality Accounting Network

REMARKS - Records poor. Flow regulated by many dams and reservoirs.

EXTREMES FOR PERIOD OF RECORD -

Max gage-height, 52.32 ft. on Feb 28, 2019; Max Discharge, 1,290,000 cfs on Feb 24, 2019.

Max water temperature: 31.50 °C on July 5, 2022

Max dissolved oxygen: 14.3 mg/L on February 21, 2015

Max pH: 8.9 pH on June 10, 2023 .

Max specific conductance: 532 uS/cm on December 3, 2016

Max turbidity: 362 FNU on January 22, 2018

Max Inst NO3+NO2,water,insitu as N2013-06-1018:00:00 (UTC -06:00) 2.79 mg/L

Min Inst NO3+NO2,water,insitu as N2015-09-05 *05:00:00 (UTC -06:00) 0.12 mg/L