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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
12389500 THOMPSON RIVER NEAR THOMPSON FALLS, MT
LOCATION - Lat 47°35'30.69", long 115°13'46.33" referenced to North American Datum of 1983, in NW 1/4 NE 1/4 SE 1/4 sec.07, T.21 N., R.28 W., Sanders County, MT, Hydrologic Unit 17010213, Lolo National Forest, on right bank 1.2 mi upstream from mouth and 5.5 mi east of Thompson Falls.
DRAINAGE AREA - 638 mi².
REVISIONS HISTORY - WSP 1246: 1911. See also PERIOD OF RECORD.
SURFACE-WATER RECORDS
PERIOD OF RECORD - March to September 1911, October 1911 to September 1916 (occasional gage heights, discharges, and discharge measurements), April 1956 to current year. Records for January and February 1911, published in Water Supply Paper (WSP) 916, have been found to be unreliable and should not be used.
GAGE - Water-stage recorder. Elevation of gage is 2,429.97 ft, referenced to the National Geodetic Vertical Datum of 1929 (Bureau of Public Roads bench mark). October 1911 to September 1916, nonrecording gage at site 0.2 mi upstream at different elevation.
REMARKS -
09-26-2019 to 01-28-2020: records are good, except estimated records are poor. 10-24-2018 to 09-25-2019: records are good, except estimated records are fair. 10-05-2017 to 10-23-2018: records are good, except estimated records are fair. 11-01-2016 to 10-04-2017: records are good, except estimated records are fair. 10-26-2015 to 10-31-2016: records are good, except estimated records are fair. 10-08-2014 to 10-25-2015: records are good, except estimated records are fair. 10-01-2013 to 10-07-2014: records are good, except estimated records are fair. Minor diversions occur upstream from station for irrigation, acreage unknown. Diversion from headwaters of Alder Creek in SW1/4 sec.16, T.23 N., R.25 W., supplement water supply for storage in Upper Dry Fork Reservoir in the Little Bitterroot River basin.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood in May to June 1948 reached a discharge of 6,190 ft³/s, by slope-area measurement of peak flow at site 0.2 mi downstream.
