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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
- For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
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USGS Water-Year Summary 2024
06130000 Flatwillow Creek near Mosby MT
LOCATION - Lat 46°55'43.18", long 107°55'58.23" referenced to North American Datum of 1983, in NW 1/4 SW 1/4 sec.33, T.14 N., R.30 E., Petroleum County, MT, Hydrologic Unit 10040203, near center of sec. 32, T.14.N., R.30.E, on right bank, downstream side of bridge on State Route 500, 4.9 mi downstream of State Highway 200, and 5.0 mi south of Mosby.
DRAINAGE AREA - 1,855 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - March 1964 to September 1966, September 2012 to September 2014, October 2016 to June 2017, July 2018 to current year.
GAGE - Water-stage recorder. Elevation of gage is 2,570 ft, North American Vertical Datum of 1988. March 1964 to February 7, 1966 wire-weight gage at present site, different datum. February 7, 1966 to September 1966, water-stage recorder 0.5 mile upstream at different datum. U.S. Geological Survey satellite telemeter is located at the station.
REMARKS - Some regulation by Petrolia Reservoir, War Horse Lake, and several smaller lakes and reservoirs. Numerous diversions for irrigation occur upstream from station.
