USGS Water-Year Summary for Site 14181900

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	Available Parameters
	00010 Temperature, water(Mean,Min.,Max.)
	00045 Precipitation(Sum)
	00065 Gage height(Mean)
	63680 Turbidity, Form Neph(Max.,Med.,Min.)

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Water year 2024: 2023-10-01 to 2024-09-30

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USGS Water-Year Summary 2024

14181900 LITTLE NORTH SANTIAM RIVER ABOVE EVANS CREEK, AT ELKHORN, OR

LOCATION - Lat 44°50'08.89", long 122°21'17.82" referenced to North American Datum of 1983, Marion County, OR, Hydrologic Unit 17090005, on the right bank at downstream side of bridge on Elkton Rd, 0.3 mi upstream from Evans Creek, and 0.36 mi east of Elkhorn.

DRAINAGE AREA - 53.1 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD - November 2020 to current year (gage heights only).

GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 1,157.87 ft above NAVD of 1988 determined by a GNSS Level II rapid-static survey performed by USGS on June 24, 2021.

EXTREMES FOR PERIOD OF RECORD - Maximum gage height, 14.24 ft Nov. 5, 2022; minimum gage height, 3.14 ft Sept. 18-20, 2023.

CLIMATOLOGICAL RECORDS

PERIOD OF RECORD - PRECIPITATION: March 2021 to current year.

INSTRUMENTATION - Unshielded, standard 8-in diameter, tipping bucket precipitation gage, mounted 10 ft above the road surface at mid span of bridge.

REMARKS - PRECIPITATION: Collection, computation, and publication of precipitation data do not necessarily conform to standards used by the National Weather Service. Records published in the report are for general scientific use.

WATER-QUALITY RECORDS

PERIOD OF DAILY RECORD -

SPECIFIC CONDUCTANCE: October 2007 to November 2009 (discontinued).

pH: October 2007 to November 2009 (discontinued).

WATER TEMPERATURE: October 2007 to November 2009, October 2023 to current year.

DISSOLVED OXYGEN: October 2007 to November 2009 (discontinued).

TURBIDITY: October 2007 to November 2009 (discontinued).

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 6026 turbidity sensor. Manufacturers stated accuracy is the greater of +/- 5 percent or 2 Formazin Nephelometric Units. 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, 51 microsiemens, Sept. 2, 2009; minimum, 13 microsiemens, Dec. 28, 2008, Jan. 1, 2, 7, 8, 2009.

pH: Maximum, 8.2 units Aug. 29, 2009; minimum, 6.8 units Dec. 27, 28, 2008, Jan. 1, 2, 7, 8, 2009.

WATER TEMPERATURE: Maximum, 25.1°C Aug. 2, 2024; minimum, 0.0°C Dec. 15, 16, 2008.

DISSOLVED OXYGEN: Maximum, 14.0 mg/L Dec. 16, 19, 2008; minimum, 7.7 mg/L July 29, 30, 2009.

TURBIDITY: Maximum, 233 FNU Nov. 12, 2008; minimum, <1 FNU on many days each year.