USGS Water-Year Summary for Site 12509489

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	Available Parameters
	00010 Temperature, water(Mean,Max.,Min.)
	00095 Specific cond at 25C(Mean,Max.,Min.)
	00300 Dissolved oxygen(Mean,Max.,Min.)
	00400 pH(Max.,Med.,Min.)
	63680 Turbidity, Form Neph(Med.,Min.,Max.)
	99133 NO3+NO2,water,insitu(Mean,Max.,Min.)

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Water year 2025: 2025-10-01 to 2026-09-30

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USGS Water-Year Summary 2025

12509489 YAKIMA RIVER AT PROSSER, WA

LOCATION - Lat 46°12'44.77", long 119°45'56.46" referenced to North American Datum of 1983, in SW 1/4 NE 1/4 sec.02, T.8 N., R.24 E., Benton County, WA, Hydrologic Unit 17030003, on left bank 1000 ft downstream of Grant Avenue bridge, 2000 ft downstream of Chandler Power Plant at Prosser Diversion Dam, and at mile 46.8.

WATER-QUALITY RECORDS

PERIOD OF RECORD - November 30, 2021, to September 30, 2024.

PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: November 30, 2021, to September 30, 2024; pH: November 30, 2021, to September 30, 2024; WATER TEMPERATURE: November 30, 2021, to September 30, 2024; DISSOLVED OXYGEN: November 30, 2021, to September 30, 2024.; NITRATE: November 30, 2021, to September 30, 2024.; TURBIDITY; February 3, 2022, to September 30, 2024.

INSTRUMENTATION - Multiparameter water-quality monitor November 30, 2021, to September 30, 2024.

EXTREMES FOR PERIOD OF RECORD -

SPECIFIC CONDUCTANCE: maximum, 314 uS/cm, February 3, 2023; minimum, 94 uS/cm, May 18, 2023.

pH: maximum, 9.2 pH units, June 7, 2023; minimum, 7.0 pH units, May 15, 2023.

WATER TEMPERATURE: Maximum, 28.6°C, July 10, 2024; minimum, 0.0°C, several days in 2021, 2022 and 2024.

DISSOLVED OXYGEN; maximum, 15.2 mg/L, December 22, 2022; minimum, 4.2 mg/L, July 11, 2024.

NITRATE: maximum, 2.6 mg/L, May 30, 2024; minimum, 0 mg/L, on several days in 2022-2024.

TURBIDITY: maximum, 383 FNU, Nov. 6, 2022; minimum, 0.1 FNU, several days in 2022.