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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
12323600 SILVER BOW CREEK AT OPPORTUNITY, MT
LOCATION - Lat 46°06'27.93", long 112°48'19.02" referenced to North American Datum of 1983, in SE 1/4 SW 1/4 SE 1/4 sec.11, T.4 N., R.10 W., Deer Lodge County, MT, Hydrologic Unit 17010201, on right bank 20 ft downstream from Stuart Street bridge, 0.5 mi east of Opportunity, and 1.0 mi upstream from Mill Creek.
DRAINAGE AREA - 343 mi².
REVISIONS HISTORY - Water Data Report MT-2001-01: Drainage area. WDR MT-2013: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - July 1988 to current year. Prior to October 1991, seasonal records only.
GAGE - Water-stage recorder. Elevation of gage is 4,912.37 ft, referenced to the National Geodetic Vertical Datum of 1929. Prior to July 1, 2013 at site 50 ft upstream Apr. 5 to Jun. 30, 2013 and at site 180 ft downstream June 30, 1988 to Apr. 5, 2013 at same datum.
REMARKS - Numerous diversions for irrigation upstream from station.
WATER-QUALITY RECORDS
PERIOD OF RECORD - March 1993 to August 1995, December 1996 to current year.
PERIOD OF DAILY RECORD -
SUSPENDED-SEDIMENT DISCHARGE: March 1993 to September 1995.
EXTREMES FOR PERIOD OF DAILY RECORD - SEDIMENT CONCENTRATION: Maximum daily mean, 563 mg/L, July 13, 1995; minimum daily mean, 3 mg/L, Sep. 16, 1993; Feb. 3-7, July 22, 1994.
SEDIMENT LOAD: Maximum daily, 495 tons, June 6, 1995; minimum daily, 0.19 ton, Feb. 4-7, 1994.
