USGS Water-Year Summary 2022
06085800 SUN RIVER AT SIMMS, MT
LOCATION - Lat 47°30'05.86", long 111°55'54.89" referenced to North American Datum of 1983, in NW 1/4 NW 1/4 SE 1/4 sec.12, T.20 N., R.3 W., Cascade County, MT, Hydrologic Unit 10030104, on left bank on downstream side of Montana Secondary Highway 565 bridge, 0.7 mi downstream from Simms Creek, 0.7 mi north of Simms, and at river mile 45.0.
DRAINAGE AREA - 1,296 mi².
- Water Data Report MT-75-1: 1964, maximum discharge. Revisions: Discharge for the period of Mar. 16, 2019 to Mar. 31, 2019, was revised on Mar. 3, 2020, based on reanalysis of the winter records.
PERIOD OF RECORD - May to June 1953 in Water Supply Paper (WSP) 1320-B, May to June 1964 in WSP 1840-B, April 1966 to September 1979, April 1997 to October 2004; April 2005 to current year (seasonal records April 2005 to October 2007).
GAGE - Water-stage recorder. Elevation of gage is 3,570 ft, referenced to the North American Vertical Datum of 1988. May 1941 to October 1965, nonrecording gage at different elevation. April 1966 to September 1979, water-stage recorder at site about 500 ft downstream at different elevation.
PERIOD OF DAILY RECORD - WATER TEMPERATURE: April 2007 to current year.
INSTRUMENTATION - Water temperature probe installed July 6, 2006 (data not published for water year 2006).
EXTREMES FOR PERIOD OF RECORD - WATER TEMPERATURE: Maximum, 28.5°C, July 19, 2007; minimum -0.3°C, Dec. 17, 2016 and Feb. 23, 2020.