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Water-Year Summary for Site 06018500

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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.
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Available Parameters
00060 Discharge(Mean)  

Water year 2020: 2019-10-01 to 2020-09-30

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USGS Water-Year Summary 2020
LOCATION - Lat 45°23'00.20", long 112°27'10.19" referenced to North American Datum of 1983, in SW 1/4 NW 1/4 SE 1/4 sec.22, T.5 S., R.7 W., Madison County, MT, Hydrologic Unit 10020002, on left bank at downstream side of bridge on State Highway 41, 11.5 mi upstream from Ruby River, 12.7 mi southwest of Twin Bridges, 14.5 mi northeast of Dillon, and at river mile 2,430.4.
DRAINAGE AREA - 3,618 mi².
REVISIONS HISTORY - Water Supply Paper (WSP) 1309: 1938, maximum discharge (M); 1945(M). WSP 1559: Drainage area.
PERIOD OF RECORD - August 1935 to current year. Prior to October 1968, published as "at Blaine."
GAGE - Water-stage recorder. Datum of gage is 4,809.15 ft, referenced to the National Geodetic Vertical Datum of 1929. Prior to Feb. 17, 1949, nonrecording gage at bridge 0.5 mi upstream at different elevation. Feb. 17, 1949, to June 28, 1951, nonrecording gage at present site and elevation.
10-02-2018 to 10-07-2019: records are good, except estimated records are poor.
11-21-2017 to 10-01-2018: records are fair, except estimated records are poor. 
06-20-2017 to 11-20-2017: records are good. 
11-22-2016 to 06-19-2017: records are good, except estimated records are poor.
10-07-2015 to 11-21-2016: records are fair, except estimated records are poor.
10-01-2014 to 10-06-2015: records are fair, except estimated records are poor. 
10-01-2013 to 09-30-2014: records are good, except estimated records are poor.  

After August 1964, flow has been partly regulated by Lima Reservoir (station number 06012000) and 
Clark Canyon Reservoir (station number 06015300). Diversions occur upstream from station for 
irrigation of about 135,400 acres, of which about 5,000 acres are irrigated by imported water from 
Birch and Willow Creeks, and of which about 9,200 acres lies downstream from station including 
600 acres in Ruby River drainage.