Lemhi River

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Lemhi River
River
Country United States
State Idaho
Counties Lemhi
Cities Leadore, Salmon
Source
 - elevation 5,954 ft (1,815 m) [1]
 - coordinates 44°40′56″N 113°21′17″W / 44.68222°N 113.35472°W / 44.68222; -113.35472 [2]
Mouth Salmon River
 - location Salmon
 - elevation 3,900 ft (1,189 m) [1]
 - coordinates 45°11′17″N 113°54′23″W / 45.18806°N 113.90639°W / 45.18806; -113.90639Coordinates: 45°11′17″N 113°54′23″W / 45.18806°N 113.90639°W / 45.18806; -113.90639 [2]
Length 60 mi (97 km) [3]
Basin 1,216 sq mi (3,149 km2) [4]
Discharge for near mouth at Salmon, ID
 - average 251 cu ft/s (7.11 m3/s) [4]
 - max 2,610 cu ft/s (73.91 m3/s)
 - min 0.75 cu ft/s (0.02 m3/s)

The Lemhi River is a 60-mile-long (97 km)[3] 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.

Course[edit]

From its source near Leadore and the confluence of several headwater streams, the Lemhi River flows generally northwest, through the Lemhi Valley, between the Lemhi Range to the west, and the Bitterroot Range and Beaverhead Mountains to the east. The Lemhi River flows into the Salmon River at the city of Salmon.

River modification[edit]

The water of the Lemhi River and its tributaries is used for irrigation agriculture. Of the river's mainstem tributaries, only 7% are not totally disconnected year round due to diversion for irrigation.[5]

History[edit]

In August 1805 Lewis and Clark crossed the continental divide at the Lemhi Pass 10 miles (16 km) to the east of the Lemhi River. There, the group encountered a tribe of Shoshone Indians, one of whom turned out to be Cameahwait, brother of Sacagawea. The expedition sent a reconnaissance party, guided by Swooping Eagle,[6] North along the Lemhi to the Salmon River attempting to find a navigable path, but turned back when they found that the Salmon was not passable by boat or on land. [6][7]

See also[edit]

References[edit]

  1. ^ a b Google Earth elevation for GNIS coordinates.
  2. ^ a b U.S. Geological Survey Geographic Names Information System: Lemhi River, USGS, GNIS
  3. ^ a b U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map, accessed May 3, 2011
  4. ^ a b Water Resource Data, Idaho, 2005, USGS.
  5. ^ Salmon Subbasin Plan, Northwest Power and Conservation Council
  6. ^ a b http://lewisandclarkjournals.unl.edu/read/?_xmlsrc=1805-08-20.xml&_xslsrc=LCstyles.xsl.
  7. ^ Cameahwait's Village, retrieved on March 11, 2008.