USGS Water-Year Summary for Site 03262700

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	00060 Discharge(Mean)

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

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USGS Water-Year Summary 2023

03262700 GREAT MIAMI RIVER AT TROY OH

LOCATION - Lat 40°02'25", long 84°11'52" referenced to North American Datum of 1927, Miami County, OH, Hydrologic Unit 05080001, 400 ft downstream from B & O Railroad bridge, 1,300 ft downstream from bridge on State Highway 55 at Troy, 1.2 mi upstream from small left bank tributary, 2.3 mi downstream from Spring Creek, and at mile 105.

DRAINAGE AREA - 926 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD - Water years 1961, 1962 (occasional low-flow measurements, published as Miami River at Troy). October 1962 to current year.

GAGE - Water-stage recorder. Datum of gage is 810.10 ft (NAVD 1988) from surveys of Oct. 2014. Prior to Oct. 1, 2013 at datum 810.67 ft (NGVD 1929).

REMARKS -

Records fair for the 2014 water year except for estimated records, which are poor. Oct. 1, 2014 to Mar. 10, 2015: records fair except for estimated records, which are poor. Mar. 11, 2014 to Apr. 9, 2015: records good except for estimated records, which are poor. Apr. 10, 2015 to Oct. 2, 2015: records fair except for estimated records, which are poor. Oct. 2, 2015 to Aug. 18, 2016: discharge records poor. Aug. 19, 2016 to Oct. 18, 2016: discharge records fair. Oct. 19, 2016 to Oct. 25, 2017: discharge records poor. Oct. 26, 2017 to Oct. 11, 2018: discharge records poor. Oct. 12, 2018 to Sep. 30, 2019 discharge records poor.

Record quality ratings will not be included in the water-year summary for approved records newer than 09/30/2019. 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.

Flood flow regulated by Lockington retarding basin on Loramie Creek 15.5 mi upstream. Low and medium flow slightly regulated by Indian Lake, 53.5 mi upstream from station, and by Lake Loramie 36.6 mi upstream from station on Loramie Creek; combined capacity, 58,900 acre-ft. Recharge to the City of Troy wellfield is largely induced infiltration from the Great Miami River. Groundwater pumpage upstream from the station is returned to the river as treated wastewater 1 mi downstream from the station and could affect low flow. Average pumpage rates in ft³/s for the following water years are in the table below:

Water Year   Average Pumpage Rate
   2014             5.69
   2015             5.78
   2016             5.48
   2017             2.68
   2018             5.61
   2019             5.47
   2020             6.04
   2021             6.07
   2022             6.22
   2023             6.47

Water-quality and sediment data formerly collected at this site.

EXTREMES OUTSIDE PERIOD OF RECORD - Flood of June 11, 1958, reached a stage of 16.4 ft; discharge, 21,000 ft³/s.