USGS Water-Year Summary for Site 14206950

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(Max.,Min.,Mean)
	00300 Dissolved oxygen(Max.,Min.,Mean)
	00400 pH(Max.,Min.,Med.)
	63680 Turbidity, Form Neph(Min.,Med.,Max.)

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

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USGS Water-Year Summary 2023

14206950 FANNO CREEK AT DURHAM, OR

LOCATION - Lat 45°24'13", long 122°45'13" referenced to North American Datum of 1927, in NE 1/4 NW 1/4 sec.13, T.2 S., R.1 W., Washington County, OR, Hydrologic Unit 17090010, on right bank, under Durham Road bridge, at Durham and at mile 1.13.

DRAINAGE AREA - 31.5 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD - September to November 1966, September 1972 to September 1977 (discharge measurements only), October 1993 to February 1996, October 2000 to current year.

GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 115.78 ft above NAVD of 1988 (levels by State of Oregon Water Resources Department).

COOPERATION - Gage-height record collected and low-flow discharge measurements provided by Clean Water Services of Washington County.

REMARKS - No known regulation or diversion upstream from station.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 1,680 ft³/s Dec. 7, 2015, gage height, 11.78 ft; maximum gage height, 11.89 ft Dec. 3, 2007; minimum discharge, 0.64 ft³/s Sept. 16, 2016.

WATER-QUALITY RECORDS

PERIOD OF RECORD -

SPECIFIC CONDUCTANCE: October 1993 to February 1996, September 2002 to current year.

pH: January 2003 to current year.

WATER TEMPERATURE: October 1993 to February 1996, September 2002 to current year.

DISSOLVED OXYGEN: January 2003 to current year.

TURBIDITY: January 2003 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 Apr. 1, 2015, 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, 760 microsiemens Aug. 13, 2021; minimum, 34 microsiemens Oct. 20, 2008.

pH: Maximum, 8.3 units Apr. 3, 4, 6, 12, 2021; minimum, 6.4 units Aug. 22, 2004, Oct. 1, 2005, Oct. 22, 23, 2014.

WATER TEMPERATURE: Maximum, 29.0°C June 28, 2021; minimum, 0.0°C Jan. 31, Feb. 1-3, 1996, Jan. 6, 7, 2004, Dec. 22, 2008, Dec. 8, 2009, Dec. 7, 8, 2013, Feb. 6, 7, 2014.

DISSOLVED OXYGEN: Maximum, 14.8 mg/l Apr. 12, 2021; minimum, 0.0 mg/l Aug. 12, 2018.

TURBIDITY: Maximum recorded, 957 FNU Nov. 10, 2008; minimum, <1 FNU on many days.