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USGS Water-Year Summary 2024
12309500 KOOTENAI RIVER AT BONNERS FERRY, ID
LOCATION - Lat 48°41'53", long 116°18'45" referenced to North American Datum of 1983, in NW 1/4 SE 1/4 NE 1/4 sec.27, T.62 N., R.1 E., Boundary County, ID, Hydrologic Unit 17010104, Bonners Ferry quad., on left bank 100 ft downstream from Highway 95 bridge at Bonners Ferry, and at mile 152.8.
DRAINAGE AREA - 12,690 mi².
REVISIONS HISTORY - WSP 1716: Maximum elevation. WDR ID-78-2: 1975 (m), 1976 (M).
SURFACE-WATER RECORDS
PERIOD OF RECORD - May to October 1904, October 1927 to current year (elevations only prior to March 1928 and October 1960 to current year). Gage heights collected in this vicinity since 1904 are contained in reports of U.S. Weather Bureau.
GAGE - Water-stage recorder. Datum of gage is 1,700.00 ft with respect to U.S. Geological Survey benchmark V-3-1929 at elevation 1,777.08 ft. Gage heights have been reduced to that datum. NGVD of 1929 is 0.02 ft higher, NAVD of 1988 is 3.826 ft higher. May 1 to Oct. 15, 1904, non recording gage on railroad bridge 0.8 mi downstream at different datum. Oct. 1, 1927 to Nov. 30, 1929, non recording gage near left bank. Dec. 1, 1929 to June 12, 1933, non recording gages on old highway bridge 40 ft downstream. Non recording gage near right bank on downstream side of highway bridge at Bonners Ferry, June 13, 1933 to Sept. 30, 1960. May 8, 1942 to present, recording gage on left bank downstream from highway bridge at present datum. Datum of gages Oct. 1, 1927 to Jan. 2, 1931, was about 0.23 ft lower.
REMARKS - Elevations affected by backwater from Kootenay Lake. Flow regulated by Libby Dam since Mar. 21, 1972 (see station 12305000).
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of June 1894 reached a stage of 1,777.2 ft, present datum.
EXTREMES FOR PERIOD OF RECORD - Maximum elevation, 1,780.13 ft, May 29, 1961; minimum, 1,741.14 ft, Dec. 5, 1929, Dec. 29, 1930, datum then in use.
WATER-QUALITY RECORDS
PERIOD OF RECORD - Continuous water temperature data were collected Oct. 2012 to current year.
