Boulder River (southwestern Montana)

For other places with the same name, see Boulder River.
Boulder River
Country United States
State Montana
County Jefferson
Source Continental Divide
 - location Boulder Mountains, Beaverhead-Deerlodge National Forest
 - elevation 7,339 ft (2,237 m) [1]
 - coordinates 46°11′22″N 112°31′54″W / 46.18944°N 112.53167°W / 46.18944; -112.53167 [2]
Mouth Jefferson River
 - location Cardwell
 - elevation 4,278 ft (1,304 m) [2]
 - coordinates 45°52′01″N 111°56′44″W / 45.86694°N 111.94556°W / 45.86694; -111.94556Coordinates: 45°52′01″N 111°56′44″W / 45.86694°N 111.94556°W / 45.86694; -111.94556 [2]
Length 77.3 mi (124 km) [3]
Location of the mouth of the southwestern Boulder River in Montana

The Boulder River is a 77-mile (124 km) tributary of the Jefferson River in southwestern Montana in the United States.[3]

It rises in the Rocky Mountains at the continental divide in the Beaverhead-Deerlodge National Forest in western Jefferson County. It flows east and southeast through the mountains past Boulder, then south to join the Jefferson near Cardwell.[4]

Game fish in the river include brook, brown, and rainbow trout, and mountain whitefish.[5] Brown trout are most prevalent in the last 2 miles (3 km), near the mouth, and the other three species are more prevalent in the reach upstream of the town of Boulder.[5] The lowermost 12 miles (19 km) of the river is affected by irrigation withdrawals, and the reach below the community of Basin is affected by seepage from old mines and tailings.[5]

See also

References

  1. ↑ Source elevation derived from Google Earth search using GNIS source coordinates.
  2. 1 2 3 "Boulder River". Geographic Names Information System. United States Geological Survey. April 4, 1980. Retrieved January 13, 2013.
  3. 1 2 "Assessment Data for Montana, Boulder Watershed (8 Digit USGS Cataloging Unit)". U.S. Environmental Protection Agency. 2006. Retrieved January 13, 2013.
  4. ↑ United States Geological Survey (USGS). "United States Geological Survey Topographic Map". TopoQuest. Retrieved January 23, 2013.
  5. 1 2 3 "Detailed Waterbody Report: Boulder River". Montana Fish, Wildlife & Parks. Retrieved January 23, 2013.

External links

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