USGS Water-Year Summary for Site 11502500

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	Available Parameters
	00010 Temperature, water(Mean,Max.,Min.)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(Max.,Min.,Mean)
	63680 Turbidity, Form Neph(Max.,Min.,Med.)
	63680 Turbidity, Form Neph(Med.,Min.,Max.) [(2)]
	99409 Susp sediment,wu,est(Max.,Mean,Min.)

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

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USGS Water-Year Summary 2024

11502500 WILLIAMSON RIVER BELOW SPRAGUE RIVER, NEAR CHILOQUIN, OR

LOCATION - Lat 42°33'51.75", long 121°52'46.97" referenced to North American Datum of 1983, in NE 1/4 SE 1/4 sec.04, T.35 S., R.7 E., Klamath County, OR, Hydrologic Unit 18010201, on right bank, 0.8 mi downstream from Sprague River, 1.2 mi southwest of Chiloquin and at mile 10.3.

DRAINAGE AREA - 3,030 mi². approximately.

REVISIONS HISTORY - WSP 981: 1938(M). WSP 1565: 1920(M), 1927(M), 1938.

SURFACE-WATER RECORDS

PERIOD OF RECORD - June 1917 to current year. Monthly discharge only for October 1922 to August 1923, published in WSP 1315-B.

GAGE - Water-stage recorder. Datum of gage is 4,148.50 ft above NGVD of 1929. Prior to Sept. 1, 1923, at different datum. Sept. 1, 1923 to July 12, 1991, at site 0.6 mi upstream at datum 7.05 ft higher.

REMARKS - Some regulation by diversion dams and log pond operations on Sprague River. Diversions for irrigation upstream from station.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 17,100 ft³/s Jan. 5, 1997, gage height, 10.27 ft; minimum discharge, 285 ft³/s Aug. 6, 8, 9, 1994.

WATER-QUALITY RECORDS

PERIOD OF DAILY RECORD -

SPECIFIC CONDUCTANCE: January 2023 to current year.

WATER TEMPERATURE: October 2007 to June 2011, March 2012 to current year.

TURBIDITY: October 2007 to May 2011, March 2012 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 Forest Technology DTS-12 turbidity sensor. Manufacturer's stated accuracy is +/- 2 percent of reading + 0.2 Formazin Nephelometric Units (FNU) for 0-399 FNU, and +/- 4 percent for 400 to 1,600 FNU. FNU values below 10 are reported to nearest 0.1 FNU. Negative recorded values are reported as 0.0 FNU. Chemical analyses and suspended sediment data collected at this location are available via NWISWeb.

EXTREMES FOR PERIOD OF DAILY RECORD -

SPECIFIC CONDUCTANCE: Maximum, 117 microsiemens Apr. 3, 2023; minimum, 76 microsiemens May 8, 9, 2023.

WATER TEMPERATURE: Maximum, 21.6°C May 20, 21, 2023; minimum, 0.0°C Dec. 8, 2013, Dec. 31, 2014, Dec. 18, 19, 2016, Jan. 6, 2017.

TURBIDITY: Maximum, 78.6 FNU Mar. 17, 2023; minimum, <1 FNU on several days during most years.