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Water-Year Summary for Site 12323700

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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.
  • For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
  • Not all sites have reports available for every water year.
Available Parameters
00060 Discharge(Mean)  
63680 Turbidity, Form Neph(Min.,Max.,Mean)  

Water year 2021: 2020-10-01 to 2021-09-30
 

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USGS Water-Year Summary 2021
12323700 MILL CREEK AT OPPORTUNITY, MT
LOCATION - Lat 46°06'51.76", long 112°49'11.19" referenced to North American Datum of 1983, in SE 1/4 SE 1/4 NE 1/4 sec.10, T.4 N., R.10 W., Deer Lodge County, MT, Hydrologic Unit 17010201, on right bank at Opportunity, 1.0 mi upstream from Mill-Willow Bypass, and at river mile 1.0.
DRAINAGE AREA - 42.5 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - April 2003 to current year.
GAGE - Water-stage recorder. Elevation of gage is 4,940 ft, referenced to the North American Vertical Datum of 1988. April 1, 2003 to July 18, 2006, water-stage recorder at site 400 ft downstream at different datum.
REMARKS - Minor diversions for irrigation occur upstream from station.
WATER-QUALITY RECORDS
PERIOD OF RECORD - March 2003 to current year.
PERIOD OF DAILY RECORD - TURBIDITY: April 2013 through current year (seasonal record).
INSTRUMENTATION - Turbidity monitor was installed in April 2013.
REMARKS -  
EXTREMES FOR PERIOD OF DAILY RECORD - TURBIDITY (seasonal records): Maximum, 616 formazin nephelometric units (FNU), June 5, 2017; minimum, <0.5 FNU, many days July through Sept. during multiple years.
EXTREMES FOR CURRENT YEAR - Turbidity: During period of seasonal operation, maximum, 66 formazin nephelometric units (FNU) May 20, 2020; minimum, < 0.5 FNU many days in August and September, 2020.