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Hiking trails & Routes
United States
Idaho
Custer County

East Fork Upper Pahsimeroi Trail

Moderate

3.1

(4)

39

hikers

East Fork Upper Pahsimeroi Trail

04:05

12.1km

580m

Hiking

Embark on the East Fork Upper Pahsimeroi Trail for a moderate hike through Idaho's rugged Lost River Range. This challenging route covers 7.5 miles (12.1 km) with a significant elevation gain of 1917 feet (584 metres), typically taking about 4 hours and 4 minutes to complete. As you ascend, you'll experience unique perspectives of the "backside" of Idaho's highest peaks, including Borah and Leatherman. The journey culminates at Dry Creek Pass, where you are greeted by expansive panoramas overlooking the vast Pahsimeroi Valley. The scenery here is truly rewarding after your climb.

When planning your visit, be aware that reaching the trailhead often requires a high-clearance vehicle due to the condition of the dirt roads. It's wise to check road conditions before you go and arrange appropriate transport. Also, snowfields can linger around the alpine lakes, even into the warmer months, so be prepared for varied conditions depending on the season. Always carry enough water and supplies for this remote adventure.

This trail offers a chance to immerse yourself in the wild beauty of the Salmon-Challis National Forest. Keep an eye out for local wildlife, as elk, moose, and bighorn sheep are known to frequent the upper valleys. The route provides a distinct opportunity to see the less-traveled side of Idaho's tallest mountains, making it a unique experience for those seeking solitude and grand vistas.

Last updated: April 23, 2026

Tips

Your route passes through a protected area

Please check local regulations for:

Salmon-Challis National Forest

Waypoints

A

Start point

Get Directions

1

6 m

East Fork Upper Pahsimeroi Trailhead

Highlight • Trail

This portion of the Pahsimeroi Trail will take you along Lost River Creek and through open meadows. The trail climbs at a fairly relaxed pace until you approach Dry Creek Pass. The last half mile to the crest of the pass is quite steep. The trail is not well traveled so keep an eye out to make sure you stay on course, and be weary of thunderstorms, but the views of Mount Breitenbach from the north are well worth the effort.

Tip by

2

6.01 km

Dry Creek Pass

Highlight • Mountain Pass

Dry Creek Pass sits just below Mount Breitenbach to the north. This marks the division between the Dry Creek Trail to the east and the East Fork Upper Pahsimeroi to the west. The views are wonderful, but be weary of thunderstorm conditions.

Tip by

B

12.1 km

End point

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Way Types & Surfaces

Way Types

12.1 km

Surfaces

12.1 km

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Elevation

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Friday 10 July

20°C

8°C

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Frequently Asked Questions

How do I access the trailhead and what are the parking conditions?

The East Fork Upper Pahsimeroi Trailhead can be challenging to reach, often requiring a high-clearance vehicle due to rough dirt roads. Parking is typically available at the trailhead itself.

Is the East Fork Upper Pahsimeroi Trail dog-friendly?

Yes, the trail is generally dog-friendly. However, given the challenging terrain, potential for wildlife encounters, and the remote nature of the area, it's crucial to keep your dog under control, preferably on a leash, and pack out all waste. Be mindful of snowfields that can persist, even into summer.

When is the best time of year to hike this trail?

The best time to hike is typically from late spring through early fall, roughly June to September. Earlier in the season, snowfields can persist, especially at higher elevations and around alpine lakes. Late summer offers vibrant wildflowers in the upper valleys, but always check current weather and trail conditions before heading out.

Are there any permits or fees required to hike in the Salmon-Challis National Forest?

Generally, no specific permits are required for day hiking the East Fork Upper Pahsimeroi Trail within the Salmon-Challis National Forest. However, it's always a good idea to check the official U.S. Forest Service website for the Salmon-Challis National Forest for any updated regulations or specific permits needed for overnight stays or certain activities.

What is the terrain like on the trail, and how challenging is it?

The trail begins with a fairly relaxed pace through open meadows along Lost River Creek. However, the difficulty quickly increases, especially the last half-mile to the crest of Dry Creek Pass, which is very steep. Hikers should be prepared for substantial elevation gains, with some sections involving 1,500 feet of ascent over just two miles. The trail is not always well-traveled, meaning you might encounter sections requiring bushwhacking or navigating via game trails. Snowfields can also persist, particularly around the lakes. Overall, parts of the trail are considered 'hard'.

What kind of scenery and wildlife can I expect to see?

You'll experience spectacular and ruggedly beautiful scenery, including unique views of the 'backside' of Idaho's tallest peaks like Borah, Leatherman, Church, and Breitenbach. Dry Creek Pass offers wonderful panoramas. Keep an eye out for abundant wildlife such as elk, moose, and bighorn sheep. Wildflowers are common in the upper valleys, and ancient fossils can sometimes be found, particularly originating from Bad Rock Peak.

Are there any specific points of interest along the route?

Beyond the stunning mountain vistas, key points include the East Fork Upper Pahsimeroi Trailhead and the panoramic views from Dry Creek Pass. You might also spot a waterfall at the base of Bad Rock Peak and potentially explore high alpine lakes like Merriam Lake and Pass Lake, though reaching some of these may involve significant cross-country travel.

Is this a loop trail or an out-and-back?

The East Fork Upper Pahsimeroi Trail is primarily an out-and-back route. While there are opportunities for extensive cross-country travel to connect with other areas or alpine lakes, the main established path follows an out-and-back configuration.

Does the trail intersect with other paths?

Yes, the route primarily follows sections of the 'East Fork Upper Pahsimeroi' trail. It also intersects with and utilizes parts of the 'Dry Creek Trail' as it ascends towards Dry Creek Pass.

Is the East Fork Upper Pahsimeroi Trail suitable for families or beginners?

Due to its significant elevation gains, very steep sections, and areas that are not always well-traveled, this trail is generally considered challenging and rated 'hard' in parts. It is best suited for experienced hikers seeking a rugged backcountry experience rather than families with young children or beginner hikers.

What should I know about navigating the trail?

Be prepared for sections where the trail may not be clearly defined, potentially requiring navigation via game trails or some bushwhacking. Snowfields can persist at higher elevations, even into summer, which may obscure the path. Always carry a map, compass, or GPS device, and know how to use them. Given the remote nature, self-sufficiency is key.

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