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Lost River Range
LostRiverRangeID.jpg
Lost River Range, looking southwest from the Lemhi Range
Highest point
Peak Borah Peak
Elevation 12,662 ft (3,859 m)
Dimensions
Length 79 mi (127 km) N/S
Width 67 mi (108 km) E/W
Area 1,799 sq mi (4,660 km2)
Geography
Country United States
State Idaho
Parent range Rocky Mountains

The Lost River Range is a high mountain range of the Rocky Mountains, located in Central Idaho, in the Northwestern United States.

It runs southeast for approximately 75 miles (121 km) from the Salmon River near the community of Challis to the Snake River Valley near Arco. To the west are the valleys of the Salmon and the Big Lost Rivers, while to the east are the Little Lost River and Pashimeroi Valleys.

The range starts at the east bank of the Salmon River, at an elevation of about 5,000 feet (1,500 m). It quickly rises to Grouse Creek Mountain (11,085 ft, 3,378 m) and Dickey Peak (11,141 ft, 3,395 m), and then descends to Double Springs Pass, location of one of just two roads to cross the range. Nearby is an interpretive site explaining the effects of the magnitude 6.9 Borah Peak earthquake that hit the range on October 28, 1983. The Big Lost River Valley fell and the Lost River Range rose, leaving a fault scarp of up to 14 ft (4.3 m) along the base of the mountains.

BorahPeakID
Borah Peak, Idaho, looking east (note 1983 earthquake fault scarp).

The range then rises into its high central section, which includes many of the state's highest peaks. Borah Peak, the highest, climbs to 12,662 ft (3,859 m). Further south are Mount Idaho (12,065 ft, 3,677 m), Leatherman Peak (12,228 ft, 3,727 m), Mount Church (over 12,200 ft, 3,720 m), Mount Breitenbach (12,140 ft, 3,700 m), and Lost River Mountain (12,078 ft, 3,681 m). To the east of this section of the range lie the remote canyons of the Upper Pashimeroi Valley, including scenic Merriam Lake.

Panorama of the Upper Pashimeroi Valley, including Leatherman Peak (center)

The range then descends to Pass Creek Summit, the second road to cross its crest. It continues to King Mountain (10,612 ft, 3,235 m), a favorite site for hang gliders. Finally it descends sharply to the Snake River Valley near the community of Arco, at an elevation of 5,300 ft (1,600 m).

MerriamLakeID
Merriam Lake, Idaho, in the Lost River Range.

Peaks

The ten highest peaks of the Lost River Range
Mountain Peak Elevation Prominence Isolation Location
Borah Peak &1000000000000385900000012,661 ft
3859 m
&100000000000018230000005,981 ft
1823 m
&10000000000242620000000150.8 mi
243 km
44°08′15″N 113°46′52″W / 44.137376°N 113.781122°W / 44.137376; -113.781122 (Borah Peak)
Leatherman Peak &1000000000000372700000012,228 ft
3727 m
&100000000000005080000001,667 ft
508 m
&100000000000072600000004.51 mi
7.26 km
44°04′55″N 113°43′59″W / 44.082038°N 113.733004°W / 44.082038; -113.733004 (Leatherman Peak)
Mount Church &1000000000000371900000012,201 ft
3719 m
&10000000000000281000000922 ft
281 m
&100000000000023700000001.47 mi
2.37 km
44°03′58″N 113°42′48″W / 44.066058°N 113.713397°W / 44.066058; -113.713397 (Mount Church)
Mount Breitenbach &1000000000000370000000012,139 ft
3700 m
&10000000000000189000000620 ft
189 m
&100000000000032400000002.01 mi
3.24 km
44°03′55″N 113°40′22″W / 44.065166°N 113.672913°W / 44.065166; -113.672913 (Mount Breitenbach)
Lost River Peak &1000000000000368100000012,077 ft
3681 m
&10000000000000206000000676 ft
206 m
&100000000000029500000001.83 mi
2.95 km
44°02′32″N 113°39′17″W / 44.042135°N 113.654658°W / 44.042135; -113.654658 (Lost River Mountain)
Mount Idaho &1000000000000367700000012,064 ft
3677 m
&100000000000003240000001,063 ft
324 m
&100000000000034900000002.17 mi
3.49 km
44°06′22″N 113°46′40″W / 44.106047°N 113.777803°W / 44.106047; -113.777803 (Mount Idaho)
Donaldson Peak &1000000000000366500000012,024 ft
3665 m
&10000000000000093000000305 ft
93 m
&100000000000010600000000.66 mi
1.06 km
44°03′51″N 113°42′02″W / 44.064177°N 113.700468°W / 44.064177; -113.700468 (Donaldson Peak)
USGS Peak &1000000000000365200000011,982 ft
3652 m
&100000000000005430000001,781 ft
543 m
&100000000000066600000004.14 mi
6.66 km
44°00′48″N 113°34′55″W / 44.013325°N 113.581851°W / 44.013325; -113.581851 (USGS Peak)
No Regret Peak &1000000000000364900000011,972 ft
3649 m
&10000000000000077000000253 ft
77 m
&100000000000012200000000.76 mi
1.22 km
44°04′15″N 113°41′18″W / 44.070711°N 113.688291°W / 44.070711; -113.688291 (No Regret Peak)
Peak 11,947 &1000000000000364800000011,969 ft
3648 m
&10000000000000185000000607 ft
185 m
&100000000000014300000000.89 mi
1.43 km
44°05′37″N 113°46′21″W / 44.093748°N 113.772629°W / 44.093748; -113.772629 (Peak 11967)
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