Lost River Mountain

Elevation: 12,078 ft
Prominence: 698

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Climbing and access information for this peak is on Page 283 of the book. Updated June 2022

Access to Lost River Mountain was recently closed at the point where it first crosses private land, The access route, BLM road MK127, crosses BLM and private land as it provides access to Forest Service land at the point where Upper Cedar Creek flows out of the Lost River Range.

Alternative Access to Lost River Mountain.

I have not tried the other roads leading to the base of the mountain. However, I imagine you can reach the starting point via one of the roads shown on this map. Kevin Renner reported that on 6/24/2022 he “took the road just a south of mile marker 116” to reach the starting point of the climb. Kevin states the road “turns right as soon as you go through the gate.” He further reports that “I don’t think 4wd would be needed but maybe a little higher clearance.” He was riding a dirt bike. The way point for the turn is 43°58’25.8″N 113°43’05.5″W.

A couple of options exists for government intervention. The BLM map below shows the  the BLM has numbered the main access road, MK127. Thus it may have an access easement through that property. So, maybe contact the BLM first. It might be able to reestablish access or it may consider grading one of the other access roads.

BLM Challis Field Office
Challis, ID 83226
Email: BLM_ID_ChallisOffice@blm.gov
Phone: 208-879-6200

A second option is to contact the Forest Supervisor. Since the road provides access to Forest Service land you could request the FS grade one of the alternative access roads shown on the map below or buy an easement from the land owner.

Salmon-Challis National Forest

Forest Supervisor’s Office
1206 S. Challis Street
Salmon, ID 83467
(208) 756-5100

Lost River Mountain is the 6th-highest peak in Idaho and is located in the Lost River Mountain Range. It is one of the nine Idaho 12ers. Its “Super Gully” is the most distinctive feature of the mountain and of any feature found on the 12ers, with the possible exception of the colorful and rugged Chicken-Out Ridge on Mount Borah.

While the vast majority of climbers summit Lost River Mountain via the Super Gully, other routes are available. Super Gully is known for its rockfall; helmets are a necessity. Most successful summits have been when there is snow in the gully. Thus a helmet, crampons, ice axe (and the ability to use it) and a rope may all be necessary. In recent years, Lost River Mountain has become a favorite of ski mountaineers. USGS Leatherman Peak

On this page:

  • Photo essay of the Super Gully Route
  • New Hyper Gully Route
  • Update on the Northwest Gully/North Ridge Route found on Page 282, including additional access information for the route.
Lost River Peak and the Super Gully, May 2016. Photo - Bob Boyles

Lost River Peak and the Super Gully (May 2016). Bob Boyles Photo

Super Gully Route, Class 3

The Super Gully Route with a camping spot shown. Photo - Dan Paulson

The Super Gully Route with a camping spot shown. Dan Paulson Photo

Looking up the Super Gully. Note that in places a trail is developing through the talus. Photo - Dan Paulson

Looking up the Super Gully. Note that in places a trail is developing through the talus. Dan Paulson Photo

It's best to climb the gully when it's full of snow. Photo - Dan Paulson

It’s best to climb the Super Gully when it’s full of snow. Dan Paulson Photo

An ice axe and crampons are essential. Photo - Dan Paulson

An ice axe and crampons are essential. Dan Paulson Photo

Looking down the route with the valley, far, far below. Photo - Dan Paulson

Looking down the Super Gully Route with the valley, far, far below. Dan Paulson Photo

The route along the summit ridge. Photo - Dan Paulson

The route along the summit ridge. Dan Paulson Photo

Crossing the summit ridge. Photo - Dan Paulson

Crossing the summit ridge. Dan Paulson Photo

The north summit of Lost River Mountain.

The North Summit of Lost River Mountain.

Hyper Gully Route, Class 4

The following information was provided by Pat Lang (Pocatello, Idaho).


On October 16, 2004, Henning Krebs and I went to climb Super Gully on Lost River Mountain. From the general parking area on the Mackay side of the mountain, we wandered up through the trees and up to the point where you can see the gully structures leading up the high ridges.

Lost River Mountain. Photo - Henning Krebs

Lost River Mountain. Henning Krebs Photo

We crossed into the debris at the bottom of this structure and stayed to the climber’s right as we moved up. We climbed to the top of the gully that we were in, passing a couple of Class 4 sections on white loose rock about two-thirds of the way up.

Once at the top of the gully, we were cliffed-out, with our only option being a move left /north into a tight gully that exits after 100 feet or so, onto a small platform. After a short, quick, low Class 5 move on the left side of the platform, we found ourselves on the ridge that leads to the false summit of Lost River Mountain. We followed the ridge to the false summit and continued on to the true summit. On our return, we descended the Super Gully.

The gully we went up is the first major gully to the right of Super Gully as you look up at the mountain from the Lost River side. I believe our ascent was probably a first ascent because we saw absolutely no sign of any other human passing. At no point did we find disturbed loose rock, scratched rocks, footprints, trash, etc.

Route Description

  • Hyper Gully access is the same access as for the Super Gully Route [(B) (12.1) on Page 292]
  • Once at the bottom of the debris/scree field, instead of crossing the debris field left/north to the small ridge that provides access to Super Gully proper, head due east up a rapidly-narrowing gully. As you proceed up, you cross some white rock bands, which are full of loose rocks and are best crossed on the left side (Class 4).
Hyper Gully Route is marked in black. Photo - Henning Krebs

The Hyper Gully Route is marked in black. Henning Krebs Photo

  • After passing these bands, stay in the ever-narrowing gully, heading for a small gate at the top of the gully. The last several hundred yards are extremely loose.
  • At the gate (which measures about 5 feet across), turn left/north and scramble up a narrow, rock-filled gully to a small platform having a small rock wall (7 feet) on its left side.
  • Climb over this wall (Class 4-5) to arrive onto a wide ridge that leads to a false summit of Lost River Mountain.
  • From the false summit, follow the ridge to the cairned summit of Lost River Mountain. To return, reverse your route to the false summit and then drop down its West Face scree field.
  • After several hundred yards, you will be in the Super Gully, which now has a well-worn “path” to follow.

    Pat Lang approaching the summit after climbing up the Hyper Gully Route. Photo - Henning Krebs

    Pat Lang approaching the summit after climbing the Hyper Gully Route. Henning Krebs Photo

Northwest Gully/North Ridge Route, Class 5

The following information was provided by Judi Steciak and Carl Hamke.

Attached is a picture and suggested edit (in bold) for the North Ridge Route on Lost River Mountain. We think that because of the rock quality and the exposure at the crux traverse, this route’s rating should be upgraded to Class 5. We do not use a rope on Class 3-4. However, we would not have done this route without one.

Northwest Gully / North Ridge Route. Photo - Judy Steciak & Carl Hamke

The Northwest Gully/North Ridge Route. Judi Steciak and Carl Hamke Photo

Judi also provided this addition to the approach section of the book, noting it “…might save someone from blowdown and rougher terrain on the other side of the creek.”

(A)(6.1)(a.1) North Ridge Lost River Mountain Cross-Country Route.
Where a prominent tributary of Dry Creek enters from the Lost River Mountain drainage, stay above the creek on its South Side. You will cross a clearing near this confluence and may encounter an outfitter camp at its southeastern end. Say hello and walk through camp to find a trail. The trail was maintained (blazes and cut logs were present) in the past and is the least strenuous approach to the upper section of the drainage. Sometime after 2005, a group wishing to promote big game hunting bought up the grazing rights for upper Dry Creek. The sheepherder camps and herds are gone. Instead, there is at least one outfitter camp in the drainage.

Return to the Idaho 12ers Page

Additional Resources

Mountain Range: Lost River Range

Year Climbed: 1989

Longitude: -113.65459   Latitude: 44.04211