USGS Water-Year Summary for Site 03228300

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	Available Parameters
	00010 Temperature, water(Min.,Mean,Max.)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(Max.,Mean,Min.)
	00300 Dissolved oxygen(Min.,Mean,Max.)
	00400 pH(Max.,Min.,Med.)

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

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USGS Water-Year Summary 2024

03228300 BIG WALNUT CREEK AT SUNBURY OH

LOCATION - Lat 40°14'10", long 82°51'05" referenced to North American Datum of 1927, Delaware County, OH, Hydrologic Unit 05060001, on left bank 200 ft downstream from bridge on State Highway 37, 0.1 mi downstream from Rattlesnake Creek, 0.6 mi east of Sunbury, and 0.9 mi upstream from Prairie Run.

DRAINAGE AREA - 101 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1988 to current year.

GAGE - Water-stage recorder. Datum of gage is 938.09 ft (NAVD 1988).

REMARKS -

For the period Oct. 1, 2015 to Feb. 20, 2018 records rated fair, except for periods of estimated record and flows below 5.0 ft³/s, which are poor. Feb. 20, 2018 to Apr. 13, 2018: discharge records poor. Apr. 14, 2018 to Aug. 6, 2018: discharge records fair except for estimated discharges, which are poor. Aug. 7, 2018 to Mar. 28, 2019: discharge records poor.

Record quality ratings may not be included in the water-year summary for approved records newer than 09/30/2018. Record quality is still being rated internally. For questions about record quality ratings, please send email to gs-w-oh_NWISWeb_Data_Inquiries@usgs.gov.

Water-quality data collected at this site.

WATER QUALITY: Oct. 1, 2013 to Oct. 21, 2018: Water temperature records good except Apr. 10, 2014 to May 19, 2014, June 4, 2015 to Jan. 27, 2016, and Mar. 23, 2017 to May 26, 2017, which are fair and Nov. 2-28, 2017, which are poor. Specific conductance records good except Mar. 27, 2015 to Apr. 21, 2015, which are fair. Dissolved oxygen records good, except Oct. 1, 2013 to Apr. 9, 2014, May 20, 2014 to June 26, 2014, Aug. 9, 2014 to Sept. 30, 2014, Nov. 8, 2014 to Mar. 26, 2015, June 6, 2015 to July 7, 2015, July 10, 2015 to Jan. 27, 2016, Apr. 1, 2018 to Sept. 7, 2018 and Sept. 29, 2018 to Oct. 21, 2018, which are fair and Apr. 10, 2014 to May 19, 2014, June 27, 2014 to Aug. 8, 2014, Oct. 1, 2014, to Nov. 7, 2014, Mar. 27, 2015 to June 5, 2015, July 8, 2015 to July 9, 2015, May 24, 2016 to June 28, 2016, July 7, to Sept. 27, 2016, May 9-26, 2017, Aug. 1-22, 2017, Nov. 18-28, 2017, and Sept. 8-28, 2018, which are poor. pH records good except Apr. 11, 2014 to May 19, 2014, Mar. 27, 2015 to Apr. 21, 2015, May 14, 2015 to June 5, 2015, and July 7, 2016 to July 20, 2016, which are fair.

WATER-QUALITY RECORDS

PERIOD OF RECORD - April 2000 to current year.

PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: April 2000 to current year. pH: April 2000 to current year. WATER TEMPERATURE: April 2000 to current year. DISSOLVED OXYGEN: April 2000 to current year.

INSTRUMENTATION - Water-quality monitor. Electronic data logger set for 1-hour interval.

EXTREMES FOR PERIOD OF RECORD -

SPECIFIC CONDUCTANCE: Maximum, 999 microsiemens, Dec. 14, 2002, minimum; 84 microsiemens, Mar. 29, 2020. pH: Maximum, 9.3 units, April 18-19, 2007 and Apr. 27, 2018; minimum, 6.5 units, Apr. 18, 2001. WATER TEMPERATURE: Maximum, 33 °C, July 24, 2001; minimum, 0.09 °C, Nov. 29, 2023. DISSOLVED OXYGEN: Maximum, 20.1 mg/L, Aug. 20, 2001; minimum, 0.3 mg/L, June 16, 2004.