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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
06169500 ROCK CREEK BELOW HORSE CREEK, NEAR INTERNATIONAL BOUNDARY
LOCATION - Lat 48°58'09.75", long 106°50'23.43" referenced to North American Datum of 1983, in NE 1/4 NW 1/4 sec.15, T.37 N., R.37 E., Valley County, MT, Hydrologic Unit 10050015, on right bank 2 mi south of international boundary, 3 mi downstream from Horse Creek, 21 mi northwest of Opheim, MT, and at river mile 82.0.
DRAINAGE AREA - 322 mi².
REVISIONS HISTORY - WSP 1509: 1925, maximum discharge. WSP 1729: Drainage area. The maximum gage height of 2009 water year was revised on September 30, 2021, based on reanalysis of data.
SURFACE-WATER RECORDS
PERIOD OF RECORD - March 1916 to October 1926, September 1956 to current year (seasonal records only prior to October 1978). Monthly discharge only for some periods are published in Water Supply Paper 1309. Published as "Rock Creek near Barnard, Mt." from 1916 to 1917. Prior to September 1956, records were collected at both Horse Creek (1914-56) and Rock Creek above Horse Creek (1914-56). Summations are equivalent to records at this site.
GAGE - Water-stage recorder. Elevation of gage is 2,530 ft, referenced to the North American Vertical Datum of 1988. March 1916 to October 1926, nonrecording gages at several sites within 500 ft upstream at different elevation.
REMARKS - Several small diversions for irrigation occur upstream from station.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Apr. 15, 1952, reached a stage of 12.6 ft, from floodmarks, discharge, 5,110 ft³/s, by slope-area measurement of peak flow.
