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Lost River (Idaho): Map

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Map of the lost streams of Idaho
There are two rivers in Idaho named "Lost", the Big Lost River and the Little Lost River. They are often considered separate streams, but both flow into the same depression and become subterranean, feeding the Snake River Plain Aquifer. The rivers are located in Custer Countymarker and Butte Countymarker, in Idahomarker in the United Statesmarker. Via the aquifer and numerous springs, they are tributaries of the Snake River.

Course

The Big Lost River is about long has two main tributary forks, the North Fork Big Lost River and the East Fork Big Lost River. The river originates in the Pioneer Mountains in Salmon-Challis National Forestmarker, flows northeast then turns southeast, with the Lost River Rangemarker to the east separating the Big Lost River Valley from the Little Lost River Valley. A dam impounds the river and creates Mackay Reservoir. Near Arcomarker the river enters the Snake River Plain, curves east and then northeast and enters the depression where the water flows into the ground, called Big Lost River Sinks. Near the sinks there is a dry distributary called Dry Channel Big Lost River.

The Little Lost River is about long. It flows southeast between the Lost River Range to the west and the Lemhi Range to the east. It enters the Snake River Plain north of the sinks and flows into them at locations called Little Lost River Sinks.

The sinks and the lower courses of both rivers are within the land of the Idaho National Laboratorymarker, northeast of Craters of the Moonmarker. Water from both rivers emerges about 100 miles (160 km) away at Thousand Springs near Hagermanmarker and other springs downstream of Twin Fallsmarker. Due to irrigation using the aquifer's water, most of the rivers' water is pumped out of the ground, used to irrigate crops, and returned to the ground as irrigation drainage, where it eventually emerges at the springs and joins the Snake River.






Basin and discharge

The Big Lost River's drainage basin is approximately in area Its mean annual discharge, as measured by USGS gage 13132500 (Big Lost River near Arcomarker), is , with a maximum daily recorded flow of , and a minimum of zero flow.

The Little Lost River's drainage basin is approximately in area Its mean annual discharge, as measured by USGS gage 13118700 (Little Lost River below Wet Creek, near Howe, Idaho), is , with a maximum daily recorded flow of , and a minimum of .

See also



References

  1. Upper Snake, Headwaters, Closed Basin Subbasins Plan Plan, Northwest Power and Conservation Council
  2. Snake River basin between Mud Lake and King Hill (includes Lost, Wood, Malad River basins), Water Resources Data, Idaho, 2005
  • "Idaho Atlas and Gazetteer". 5th ed. DeLorme, 2002.
  • Big Lost River, The Columbia Gazetteer of North America.
  • Little Lost River, The Columbia Gazetteer of North America.
  • , USGS GNIS.
  • , USGS GNIS.
  • , USGS GNIS.
  • , USGS GNIS.
  • , USGS GNIS.
  • , USGS GNIS.
  • , USGS GNIS.



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