USGS Water-Year Summary for Site 14186200

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00025 Air pressure(Max.,Min.,Mean)
	00047 Pressure, diss gases(Max.,Min.,Mean)
	00065 Gage height(Mean)
	00300 Dissolved oxygen(Max.,Min.,Mean)
	63680 Turbidity, Form Neph(Max.,Min.,Med.)

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

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USGS Water-Year Summary 2024

14186200 MIDDLE SANTIAM RIVER BELOW GREEN PETER DAM, NEAR FOSTER, OR

LOCATION - Lat 44°26'54", long 122°32'57" referenced to North American Datum of 1927, in NE 1/4 SE 1/4 sec.10, T.13 S., R.2 E., Linn County, OR, Hydrologic Unit 17090006, on right bank, downstream from Green Peter Dam, 7.0 mi northeast of Foster and at mile 5.25.

DRAINAGE AREA - 273 mi².

REVISIONS HISTORY - WDR-US-2010: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - July 2010 to current year (gage heights only). Prior to October 2013, published as "below Green Peter Lake."

GAGE - Water-stage recorder and crest-stage gage. Datum of gage is NAVD of 1988.

REMARKS - Flow regulated by Green Peter Lake (active capacity, 330,800 acre-ft).

EXTREMES FOR PERIOD OF RECORD - Maximum gage height, 714.83 ft Apr. 12, 2019; minimum gage height, 693.84 ft Aug. 9, 2013.

CLIMATOLOGICAL RECORDS

PERIOD OF RECORD - BAROMETRIC PRESSURE: March 2022 to current year.

INSTRUMENTATION - Meteorological monitor.

EXTREMES FOR PERIOD OF RECORD - BAROMETRIC PRESSURE: Maximum, 757 mmHg Mar. 7, 2022; minimum, 721 mmHg Dec. 27, 2022.

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

WATER-QUALITY RECORDS

PERIOD OF DAILY RECORD -

WATER TEMPERATURE: October 2007 to June 2008, February 2009 to current year.

DISSOLVED OXYGEN: August 2023 to current year.

TURBIDITY: August 2023 to current year.

TOTAL DISSOLVED GAS: March 2017 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 an Aqua-TROLL 600 sonde. Manufacturer's stated Accuracy is the greater of +/- 2 percent or +/- 0.5 Formazin Nephelometric Units (FNU) for 0-4000 FNU. FNU values below 10 are reported to nearest 0.1 FNU. Negative recorded values are reported as 0.0 FNU. Additional parameters collected at this location are available via NWISWeb.
Water-quality data collected at this location provides a representative value of the cross section due to adequate mixing of flow from Green Peter dam tailwater gates 225 ft upstream of probe.

EXTREMES FOR PERIOD OF DAILY RECORD -

WATER TEMPERATURE: Maximum, 16.1°C Oct. 25, 27, 28, 2015; minimum, 4.3°C Feb. 17, 19, Mar. 10, 11, 2008.

DISSOLVED OXYGEN: Maximum, 13.1 mg/L Sept. 12, 13, 2023; minimum, 8.4 mg/L Sep. 30, 2023.

TURBIDITY: Maximum, 9.3 FNU Sept. 19, 2023 minimum, >1 FNU on many days.

TOTAL DISSOLVED GAS: Maximum, 924 mmHg Apr. 5, 2022; minimum, 741 mmHg Dec. 10, 2022, Feb. 27, Mar. 9, 10, 2023.