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ForestMatters, LLC

Tucannon River Loop

Umatilla National Forest, Oregon · 3 min read

Distance
8 mi
Elevation Gain
1,600 ft
Difficulty
moderate-hard
Route Type
Loop
Best Season
June through October
Est. Time
4-5 hours
Dog Friendly
Yes
Kid Friendly
No
Difficulty Score
8 / 10

Trailhead Amenities

Restroom
Vault Toilet
Parking
Free
Cell Service
No Signal
Water
Nearby
Camping
Dispersed
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Conditions, regulations, and fees change frequently. Verify with the local ranger district before your trip. Full disclaimer

At a Glance

  • Wenaha-Tucannon Wilderness canyon country, one of the most remote areas in Washington
  • Rocky Mountain bighorn sheep on canyon rims and steep rocky slopes
  • Tucannon River, a cold tributary of the Snake River with wild steelhead
  • 1,600 feet of canyon rim-to-river descent with dramatic basalt scenery
  • Low visitor traffic even on summer weekends
riverwildlifeviewsrock formations

Overview

The Tucannon River Loop descends from the rim of the Wenaha-Tucannon Wilderness into the canyon of the Tucannon River, one of the most remote rivers in Washington state. The 8-mile loop involves 1,600 feet of elevation change, with a steep descent to the river and a sustained climb back to the rim via a connecting ridge trail. The wilderness character is genuine: no motor vehicles, minimal trail markings, and canyon scenery that rewards the effort to get here.

Rocky Mountain bighorn sheep are the wildlife highlight. The steep basalt canyon walls of the Wenaha-Tucannon have supported a thriving bighorn population since reintroduction in 1967, and this loop puts hikers on the same canyon terrain the sheep use daily. Early morning is the best time for bighorn encounters.

This trail is accessed from the Washington side of Umatilla National Forest near Pomeroy. No permit is required.

The Route

Miles 0 to 2: Rim to river descent. The trail begins at the rim at around 4,200 feet and drops steadily through bunchgrass and scattered ponderosa toward the river. The trail is clear but steep, with loose basalt gravel on some sections. Views across the canyon improve as the trail descends.

Miles 2 to 5: River corridor. The trail reaches the Tucannon River at around 2,800 feet and turns downstream (north). This is the flattest and most pleasant section, following the river through cottonwood groves and open canyon bottomland. Bighorn sheep are frequently spotted on the canyon walls during this section.

Miles 5 to 8: Return climb via ridge trail. A connecting trail climbs back to the rim via a secondary ridge, offering different views than the descent route. The climb is sustained but not excessively steep. The final mile returns through the bunchgrass rim plateau to the trailhead.

When to Hike

June through September is the primary hiking season. The descent is manageable once winter snow has cleared from the rim (typically late May). Summer temperatures in the canyon bottom can be warm; start early.

October is excellent for wildlife. Bighorn rams are more active in pre-rut, and steelhead push into the river. Hunting season starts in October; wearing blaze orange in the non-wilderness portions near the trailhead is recommended.

What to Bring

Many hikers carry 2 liters of water for this loop. The river is a nearby source but requires treatment. Trekking poles are strongly recommended for the steep descent and ascent sections. Study the route on an offline map before leaving the trailhead, as markings in the wilderness are minimal.

Trailhead Access

From Pomeroy, Washington, take WA-12 east briefly then turn south on Pomeroy Canyon Road. Follow forest road signs toward the Wenaha-Tucannon Wilderness boundary. The drive from Pomeroy is about 20 miles on paved and gravel roads.

Nearby

The Wenaha River Trail is the other major canyon route in the Wenaha-Tucannon, entering from Troy, Oregon on the south side of the wilderness. The full Umatilla National Forest connects both sides of the state line wilderness. Review Leave No Trace principles before entering the wilderness.

Trailhead Parking

Pomeroy Canyon Road Trailhead, off WA-12 south of Pomeroy, Washington. Gravel parking area. No fee. Vault toilet nearby.

← Back to Umatilla National Forest

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Frequently Asked Questions

Is the Tucannon River Loop in Oregon or Washington?
The Wenaha-Tucannon Wilderness straddles the Oregon-Washington border, and this loop is accessed from the Washington side via Pomeroy. The loop itself crosses the state line at least once during the route. Both the Oregon and Washington portions are managed by Umatilla National Forest.
How difficult is the canyon descent?
The descent to the river gains about 1,000 feet in 2 miles on a consistent grade. It is the most demanding section of the loop and requires sure footing on loose basalt gravel in places. Trekking poles are recommended. The return climb is the same grade but sustained uphill.
Are bighorn sheep commonly seen on this route?
Rocky Mountain bighorn sheep inhabit the canyon walls throughout the Wenaha-Tucannon. They are most reliably spotted in early morning when they come to the river to drink, and on the rimrock in late afternoon. October through March is particularly good for bighorn viewing as they spend more time on lower canyon slopes.