Pasayten Wilderness Mega Traverse Expedition

🏔️ Pasayten Wilderness Mega Traverse Expedition

Mount Rolo → Osceola → Carru → Lago → Dot → Ptarmigan → Blackcap → Pass Butte → Lost → Johnny → Many Trails

Duration: 4 Days / 3 Nights
Season: Early June 2026 (Very Low Snow Year)
Style: Backpacking + Peakbagging Traverse
Difficulty: Advanced Wilderness Mountaineering
Technical Difficulty: Mostly Class 2, occasional Class 3 route finding
Total Distance: ~50–60 miles
Total Elevation Gain: ~18,000–22,000 ft
Bulgers: 6/100

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🎯 Expedition Objective

Complete one of the premier peakbagging traverses in the Pasayten Wilderness, linking:

Mount Rolo 🌟
Osceola Peak ⭐
Mount Carru ⭐
Mount Lago ⭐
Dot Mountain 🌟
Ptarmigan Peak ⭐
Blackcap Mountain ⭐
Pass Butte 🌟
Lost Peak ⭐
Johnny Peak 🌟
Many Trails Peak 🌟

⭐ = Bulger Peak
🌟 = Top 200

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🚗 Travel Logistics

Thursday Evening

Drive from Seattle to the Pasayten.

Approximate drive:

Seattle → Winthrop → Loomis → Slate Peak Road

Distance:
~280 miles

Time:
~6.5 hours

Recommended:

✅ Sleep at trailhead

or

✅ Car camp near Iron Gate

Early start is critical.

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🗺️ Route Overview

The traverse naturally breaks into:

Phase 1

Northern Okanogan Range

Rolo
Osceola
Carru

Phase 2

Lago Basin

Lago
Dot

Phase 3

Central Crest

Ptarmigan
Blackcap
Pass Butte

Phase 4

Southern Peaks

Lost
Johnny
Many Trails

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DAY 1

Iron Gate → Rolo → Osceola → Carru

Camp: Carru Basin

🥾 Distance:
~13 miles

⬆️ Gain:
~5,500 ft

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Start

Leave trailhead:

5:00 AM

Follow the Boundary Trail south.

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🏔️ Mount Rolo

Class 2

Easy tundra slopes.

Roundtrip off-route:
~1 mile

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🏔️ Osceola Peak ⭐

Class 2

One of the finest summits in the Okanogan Range.

Outstanding views toward:

Lago
Carru
Cathedral Group

Allow:
1.5 hours

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🏔️ Mount Carru ⭐

Class 2

Continue south via broad ridge.

This is straightforward in low-snow conditions.

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🏕️ Camp 1

Carru Basin

Why camp here:

✅ Reliable water

✅ Beautiful scenery

✅ Excellent positioning for Lago

✅ Protected from wind

Elevation:
~7,000 ft

Expected arrival:
5–7 PM

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DAY 2

Carru Basin → Lago → Dot → Ptarmigan

Camp: Ptarmigan Basin

🥾 Distance:
~11 miles

⬆️ Gain:
~4,000 ft

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🏔️ Mount Lago ⭐

Class 2

Highest summit of the trip.

One of Washington’s great Bulgers.

Allow:

2–3 hours from camp.

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🏔️ Dot Mountain

Class 2

Quick bonus summit.

Minimal extra effort.

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🏔️ Ptarmigan Peak ⭐

Class 2

Long scenic ridge travel.

Some talus.

No major difficulties expected in a low snow year.

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🏕️ Camp 2

Ptarmigan Basin

Excellent water.

Excellent sunset.

Ideal launch point for Blackcap.

Elevation:
~6,800–7,000 ft

Arrival:
4–6 PM

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DAY 3

Ptarmigan → Blackcap → Pass Butte → Lost

Camp: Lost Creek Basin

🥾 Distance:
~12–14 miles

⬆️ Gain:
~5,000 ft

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🏔️ Blackcap Mountain ⭐

Class 2–3

One of the best viewpoints in the Pasayten.

Short scrambling near summit.

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🏔️ Pass Butte

Class 2

Easy summit.

Fast ascent.

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🏔️ Lost Peak ⭐

Class 2–3

Perhaps the most rugged mountain on the route.

Excellent views.

Some loose terrain.

Take your time.

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🏕️ Camp 3

Lost Creek Basin

Reliable water.

Protected campsites.

Excellent positioning for final day.

Arrival:
5–7 PM

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DAY 4

Johnny → Many Trails → Exit

🥾 Distance:
~15–18 miles

⬆️ Gain:
~3,000 ft

⬇️ Loss:
~6,000+ ft

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🏔️ Johnny Peak

Class 2

Quick summit.

Mostly tundra.

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🏔️ Many Trails Peak

Class 2

Final summit.

Excellent finale to the traverse.

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Exit

Follow trail system northward back toward Iron Gate.

Expected trailhead arrival:

4–8 PM

depending on pace.

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💧 Water Strategy

Low snow year means many seasonal streams may already be drying.

Reliable sources:

✅ Carru Basin

✅ Lago Basin

✅ Ptarmigan Basin

✅ Lost Creek Basin

Always leave camp with:

2–3 liters

Do not assume ridge water.

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⚠️ Major Hazards

Heat

Likely your biggest challenge.

Expect:

70–85°F afternoons

Little shade.

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Navigation

Much of the traverse is off-trail.

Bring:

Gaia GPS
CalTopo Offline Maps
Paper map backup

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Loose Talus

Most common around:

Lost
Blackcap
Lago

Helmets recommended.

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Wildlife

Expect:

🫎 Moose

🦌 Deer

🐐 Mountain goats

🐻 Black bears

🐿️ Marmots

Store food carefully.

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📋 Recommended Gear

Shelter

✅ Lightweight 3-season tent

Sleep

✅ 20–30°F bag

Navigation

✅ Gaia GPS

✅ CalTopo

✅ Compass

Footwear

✅ Trail runners or light mountaineering boots

Snow travel equipment likely unnecessary if the low-snow trend continues, but monitor conditions closely before departure.

Emergency

✅ Satellite communicator (Garmin InReach)

Strongly recommended due to the remoteness.

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🏆 Mountaineering Significance

Completion of this traverse would earn:

✅ 6 Bulgers

✅ Most major summits surrounding Lago Basin

✅ One of the largest Okanogan Range traverses commonly undertaken

✅ Roughly 6% of the entire Bulger List

✅ A highly respected wilderness peakbagging accomplishment among Washington climbers

For a Washington mountaineer, this is the kind of trip that stands out because of its combination of remoteness, efficiency, endurance, and route-finding, rather than technical climbing difficulty. Completing all 11 peaks in a continuous 4-day push would be a serious Pasayten achievement. 🏔️🔥

IMPORTANT- This is NOT a guided trip, you are responsible for yourself when you sign up.