USGS Water-Year Summary for Site 11501000

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

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

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USGS Water-Year Summary 2024

11501000 SPRAGUE RIVER NEAR CHILOQUIN, OR

LOCATION - Lat 42°35'03.5", long 121°50'54.0" referenced to North American Datum of 1983, in NE 1/4 NW 1/4 sec.35, T.34 S., R.7 E., Klamath County, OR, Hydrologic Unit 18010202, on right bank, 1.0 mi northeast of Chiloquin, 4.6 mi upstream from Modoc Point Canal intake and at mile 5.4.

DRAINAGE AREA - 1,565 mi².

REVISIONS HISTORY - WSP 591: 1922(M). WSP 1011: 1943(M). WSP 1565: 1921-22.

SURFACE-WATER RECORDS

PERIOD OF RECORD - July to October 1920, March 1921 to current year. Monthly discharge only July 1920, published in WSP 1315-B. Prior to October 1931, published as "at McCready Ranch, near Chiloquin."

GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 4,202.43 ft above NGVD of 1929. Prior to Oct. 1, 1931, nonrecording gage at site 12 mi upstream at different datum.

REMARKS - Diversions for irrigation upstream from station.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 14,900 ft³/s Dec. 26, 1964, gage height, 10.37 ft; minimum daily discharge, 50 ft³/s May 26, 1926.

WATER-QUALITY RECORDS

PERIOD OF RECORD -

SPECIFIC CONDUCTANCE: February 2023 to current year.

WATER TEMPERATURE: April 2005 to current year.

TURBIDITY: November 2007 to August 2010, April 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 400-1,600 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, 133 microsiemens Apr. 7, 2023; minimum, 68 microsiemens May 8, 2023.

WATER TEMPERATURE: Maximum, 29.6°C July 2, 2015; minimum, 0.0°C on many days most years.

TURBIDITY: Maximum, 95 FNU Jan. 21, 2016; minimum, <1 FNU on several to many days during most years.