Pahsimeroi River

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Pahsimeroi River
Country United States
State Idaho
Counties Lemhi, Custer
 - elevation 7,745 ft (2,361 m) [1]
 - coordinates 44°4′22″N 113°40′14″W / 44.07278°N 113.67056°W / 44.07278; -113.67056 [2]
Mouth Salmon River
 - elevation 4,640 ft (1,414 m) [1]
 - coordinates 44°41′31″N 114°2′55″W / 44.69194°N 114.04861°W / 44.69194; -114.04861Coordinates: 44°41′31″N 114°2′55″W / 44.69194°N 114.04861°W / 44.69194; -114.04861 [2]
Length 59 mi (95 km)
Basin 827 sq mi (2,142 km2) [3]
Discharge for at mouth
 - average 230 cu ft/s (6.5 m3/s) [3]
 - max 710 cu ft/s (20.1 m3/s)
 - min 87 cu ft/s (2.5 m3/s)

The Pahsimeroi River is a 58.7-mile-long (94.5 km)[4] river in Idaho in the United States. It is a tributary of the Salmon River, which in turn is tributary to the Snake River and Columbia River.


From its source in Custer County, at the confluence of the West Fork and East Fork headwaters, the Pahsimeroi River flows generally northwest, through the Pahsimeroi Valley, between the Lemhi Range to the east, and the Lost River Range and to the west.

The Pahsimeroi River joins the Salmon River near Ellis, Idaho, upriver from Salmon, Idaho.

River modification[edit]

The water of the Pahsimeroi River and its tributaries is used for irrigation agriculture. All of the river's mainstem tributaries are wholly diverted and totally disconnected year round due to diversion for irrigation.[5]

See also[edit]


  1. ^ a b Google Earth elevation for GNIS coordinates.
  2. ^ a b U.S. Geological Survey Geographic Names Information System: Pahsimeroi River, USGS, GNIS
  3. ^ a b Water Resource Data, Idaho, 2005, USGS.
  4. ^ U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map, accessed May 3, 2011
  5. ^ Salmon Subbasin Plan, Northwest Power and Conservation Council