Peak 11189 (Mahogany Trident)

Elevation: 11,189 ft
Prominence: 329

This peak is not in the book. 


Mahogany Trident is located north of Mount Borah and south of Doublesprings Pass in a cluster of 11ers that include Al West Peak, Horseshoe Peak, and Doublesprings Peak. The peak has a long, narrow east-west trending summit ridge. The only practical approach to the summit is via the peak’s east ridge.

Mahogany Trident from upper Mahogany Creek. The east ridge is on the right.

Mahogany Trident from upper Mahogany Creek. The east ridge is on the right.


Access

The USGS topography map does not show the main approach road, FS-318, but it does show up on the USFS maps. FS-318 is a 4WD road that penetrates deep into the Mahogany Creek drainage and nearly leads to the peak’s east ridge. Access the peak from FS-267, the West Fork Pahsimeroi Road (C)(3.1), described on page 293 of Idaho A Climbing Guide.

This road leads up and over hills and ridges on the north side of Mahogany Creek to 8,700 feet where it becomes extremely steep and eventually dies out around 9,100 feet. There are several fair campsites along the road. Follow the road to 8,700 feet and park.

The FS-318 shown on the map starts at this unassuming gate. Another road just to the south of this road has a cattleguard and a sign indicating in error that it is FS-318. The misnumbered road is a dead end.

The FS-318 shown on the map starts at this unassuming gate. Another road just to the south of this road has a cattleguard and a sign indicating, in error, that it is FS-318. The misnumbered road is a dead end.

This map shows the access from the Pahsimeroi Road into the upper reaches of Mahogany Creek and routes on Mahogany Trident and Mountaineer Peak.

This map shows the access from the Pahsimeroi Road into the upper reaches of Mahogany Creek and routes on Mahogany Trident and Mountaineer Peak.


East Ridge, Class 2+

From 8,700 feet, follow the ever steepening road up toward the east ridge. Note: The road no longer exists as shown on the map. At 9,000 feet, continue through the thinning forest to the east ridge. This ridge is composed of mixed-consistency talus, but with generally good footing. There is a series of cliffs between 10,400 and 10,600 feet. The cliffs are easily bypassed on their west side. Follow the ridge to the summit. The climb involves 2,400 feet of gain in 1.5 miles.

Looking up the east ridge from just above treeline.

Looking up the east ridge from just above treeline.

Approaching the cliff band at 10,400 feet.

Approaching the cliff band at 10,400 feet.

The final distance to the summit is a narrow, almost knife-edge walk with significant exposure on the north side of the ridge.

The final distance to the summit is a narrow, almost knife-edge, walk with significant exposure on the north side of the ridge.

Peak 11189, Mahogany Trident. George Reinier Photo

Peak 11189, Mahogany Trident. George Reinier Photo

Rick Baugher's note in the summit register. George Reinier Photo

Rick Baugher’s note in the summit register. George Reinier Photo

 

Climber Trip Reports

Mountain Range: Lost River Range

Year Climbed: 2017

First Ascent Information:

  • First Ascent Year: 1924
  • Season: Summer
  • Route: East Ridge
  • Party: US Geological Survey

Longitude: -113.79399   Latitude: 44.19247

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