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Sun River Project Water Data

Sun River Project  -  Main Page

Project Water Supply

Normal

15.21 in  

Maximum  -  1975

25.24 in  

Minimum   -  1979

9.91 in  

Great Falls, Montana 1961-1990

  

      Temperature

Mean Annual

44.7 °F  

Daily Maximum  -  08/05/1961

106 °F  

Daily Minimum   -  12/29/1968

-43 °F  

Great Falls, Montana 1948-1996

  

Growing Season

129 days  

Elevation of irrigable area

3,700 ft  

      North Fork Sun River

Drainage area above Gibson Dam

258 mi2  

Annual discharge:

  

    Maximum  -  1959

346,834 acre-ft  

    Minimum   -  1945

14,995 acre-ft  

    Average    -  1911-1993

265,584 acre-ft  

                             Streamflows:  North Fork Sun River near Augusta, Montana (USGS)

      South Fork Sun River

Drainage area above Gibson Dam

252 mi2  

Annual discharge:

  

    Maximum  -  1911

245,982 acre-ft  

    Minimum   -  1912

236,396 acre-ft  

    Average    -  1911-1912

241,189 acre-ft  

                             Streamflows:  South Fork Sun River near Augusta, Montana (USGS)
 

Project Water Quality

 
 

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