USGS Water-Year Summary for Site 12322000

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00060 Discharge(Mean)
	00065 Gage height(Mean)
	30208 Discharge(Mean) [m^3/s]
	99065 Gage height(Mean) [Meters]

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

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USGS Water-Year Summary 2023

12322000 KOOTENAI RIVER AT PORTHILL, ID

LOCATION - Lat 48°59'47", long 116°30'27" referenced to North American Datum of 1983, in SE 1/4 NE 1/4 SE 1/4 sec.07, T.65 N., R.1 W., Boundary County, ID, Hydrologic Unit 17010104, Smith Falls quad., on right bank 1,200 ft south of international boundary at Porthill, and at mile 105.8.

DRAINAGE AREA - 13,700 mi².

REVISIONS HISTORY - SWD ID 1971-75(m).

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 2013 to current year. May to July 1904, October 1927 to March 1928 (elevations only), October 1924 to September 1927 (gage heights only) in reports of Water Survey of Canada, Department of Environment. Starting in water year 2014, daily mean discharge values are presented only for the discharge measured at 12322000. Prior to water year 2014, the daily mean discharge values represented the total discharge passing the international boundary, which included inflows from Boundary Creek. Total discharge passing the international boundary is now available under station 12322001.

GAGE - Water-stage recorder and acoustic doppler velocity meter. Datum of gage is 1,700.00 ft above Topographic Division Datum of 1928. NGVD of 1929 and datum of Geodetic Survey of Canada are 0.03 ft higher (NAVD88 is 3.896 ft higher). Prior to May 17, 1928, non recording gages at approximately same site. Datum of gages prior to July 28, 1928, 38.34 ft higher, except in 1904 when different datum was used. Prior to March 27, 1996, at site 1,500 ft downstream at same datum.

COOPERATION - This station is maintained by the United States under agreement with Canada.

REMARKS - Boundary dike of Reclamation Farm and U.S. Forest Service roadway dike (south side of Boundary Creek) remained intact and flow of river was confined throughout year to main channel on which gage is located. Elevations affected by backwater from Kootenay Lake. Flow regulated by Libby Dam started on Mar. 21, 1972.

EXTREMES OUTSIDE PERIOD OF RECORD - Maximum elevation known, 1,772.7 ft in June 1894, present datum.

EXTREMES FOR PERIOD OF RECORD - Maximum daily discharge, 48,900 ft³/s May 18, 2014; maximum elevation, 1755.09 ft, May 24, 2014; minimum daily discharge 4100 ft³/s Oct. 19, 2015; minimum elevation 1740.90 ft Mar. 3, 2014.

WATER-QUALITY RECORDS

PERIOD OF RECORD - Continuous water temperature data were collected Jan. 1949 to Sept. 1950, Sept. 1963 to current year.

REMARKS - Numerical uncertainty is not currently computed for time-series water-quality records but qualitative ratings are provided based on professional judgment.

Water Year 2014: Quality of water-temperature records good.

Water Year 2015: Quality of water-temperature records good.

Water Year 2016: Quality of water-temperature records good.

The practice of using qualitative ratings to describe data accuracy was discontinued in Water Year 2017.

EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum, 23.5 °C July 27, 1975, July 29-31, 1988; minimum, 0.0 °C many days during winter months.