USGS Water-Year Summary for Site 453030122560101

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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.)
	63680 Turbidity, Form Neph(Med.,Min.,Max.)

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

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USGS Water-Year Summary 2024

453030122560101 ROCK CREEK AT BROOKWOOD AVENUE, HILLSBORO, OR

LOCATION - Lat 45°30'29.5", long 122°56'00.6" referenced to North American Datum of 1983, Washington County, OR, Hydrologic Unit 17090010, and on left bank.

DRAINAGE AREA - 72 mi².

WATER-QUALITY RECORDS

PERIOD OF RECORD -

SPECIFIC CONDUCTANCE: May 2004 to current year.

pH: May 2004 to current year.

WATER TEMPERATURE: May 2004 to current year.

DISSOLVED OXYGEN: May 2004 to current year.

TURBIDITY: May 2004 to current year.

INSTRUMENTATION - Water-quality monitor. Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government.

REMARKS - TURBIDITY: Data collected using a YSI EXO2 sonde. Manufacturer's stated accuracy is the greater of +/- 2 percent or 0.3 Formazin Nephelometric Units (FNU) for 0-999 FNU, and +/- 5 percent for 1,000-4,000 FNU. Prior to Nov. 24, 2014, data collected using a YSI 6026 turbidity sensor. Manufacturer's stated accuracy is the greater of +/- 5 percent or 2 FNU. FNU values below 10 are reported to nearest 0.1 FNU. Negative recorded values are reported as 0.0 FNU.

EXTREMES FOR PERIOD OF DAILY RECORD -

SPECIFIC CONDUCTANCE: Maximum, 547 microsiemens Aug. 24, 2023; minimum, 60 microsiemens Dec. 7, 2015.

pH: Maximum, 8.8 units Mar. 3, 2020; minimum, 6.4 units Oct. 22, 23, 2017, Nov. 5, 2022.

WATER TEMPERATURE: Maximum, 28.8°C June 28, 2021; minimum, -0.1°C Dec. 16, 2008, Dec. 7, 2009, Dec. 7, 2013.

DISSOLVED OXYGEN: Maximum, 14.0 mg/L Feb. 6, 2014; minimum, 0.6 mg/L Sept. 10, 2020.

TURBIDITY: Maximum recorded, 491 FNU Nov. 2, 2004; minimum, 1.4 FNU Aug. 5, 2020, June 29, 2021.