Tumac Mountain & Twin Sisters Lakes

Hike to lakes or a mountain just south of Bumping Lake in the William O. Douglas Wilderness. It's up to 15.1 miles round trip and 2,400 feet of elevation gain.

Getting there

From SR 410, 19 miles east of Chinook Pass, turn south onto Bumping River Road (Forest Road 18). Continue on paved road for 11 miles. After 11 miles where the paved road turns right and heads toward Bumping River Damn, stay straight and drive on Forest Road 1800 for 2.6 miles. Then turn left onto Forest Road 1808 and follow until it ends at the Deep Creek Trailhead and a small campground (4,300 ft).

On the Trail

Besides these, there are several out-and-back and loop trip options from  the Deep Creek Trailhead and many lakes to visit along the way.

Tumac Mountain

7.8 miles round trip 2,130 feet of elevation gain

A moderate day hike on trail to the top of Tumac Mountain.

Twin Sisters Lakes

5 miles round trip, 1,060 feet of elevation gain

An easy day hike to and from South Twin Sisters Lakes. You can also loop via the Indian Creek Trail.

Tumac Mountain & Twin Sisters Lakes Loop

15.1-mile loop, 2,400 feet of elevation gain

Hike south past Twin Sisters Lakes and on to Tumac Mountain. Continue southwest to the Pacific Crest Trail (PCT), turn north on the PCT and follow it to the junction with the Twin Sisters Lakes Trail. Head back to the trailhead from here.

  • Suitable Activities: Backpacking, Day Hiking
  • Seasons: July, August, September, October
  • Weather: View weather forecast
  • Difficulty: *Varies*, Easy, Moderate
  • Length: 15.1 mi
  • Elevation Gain: 2,500 ft
  • 6,340 ft
Map
  • Green Trails Goat Rocks William O Douglas Wilderness No. 303S
  • Trails Illustrated Goat Rocks, Norse Peak & William O. Douglas Wilderness Areas
  • Green Trails White Pass No. 303
Activities

Upcoming Activities

Backpack - Tumac Mountain & Twin Sisters Lakes Loop

Backpacking Trip
Fall backpack trip to the plateau north of White Pass. Meadows in fall colors, lakes
Difficulty: Moderate
Sat, Sep 30, 2023 - Sun, Oct 1, 2023
No Prerequisites, Leader's Permission Required
1 participant
Registration closes Sep 28
Tacoma Branch
Brian Carpenter

Day Hike - Tumac Mountain & Twin Sisters Lakes Loop

Day Hiking Trip
Visit the ancient cinder cone of Tumac Mountain as we tour the Tumac Plateau in
Difficulty: Moderate/Strenuous
Sat, Oct 7, 2023
No Prerequisites
2 participants on waitlist 1 leader
Registration closes Oct 5
Tacoma Branch
Nicole Hansen
Trip Reports
Titles

This is a list of titles that represent the variations of trips you can take at this route/place. This includes side trips, extensions and peak combinations. Not seeing a title that fits your trip? Log in and send us updates, images, or resources.

  • Tumac Mountain
  • Twin Sisters Lakes
  • Tumac Mountain & Twin Sisters Lakes Loop
  • Twin Sisters, Jug & Penoyer Lakes
  • Twin Sisters, Jug & Penoyer Lakes Loop
  • Twin Sisters & Blankenship Lakes
  • Twin Sisters & Blankenship Lakes Loop
  • Twin Sisters, Blankenship, Apple & Pear Lakes
  • Twin Sisters, Blankenship, Apple & Pear Lakes Loop
  • Blankenship, Apple & Pear Lakes
  • Blankenship, Apple & Pear Lakes Loop
Resources

There are no resources for this route/place. Log in and send us updates, images, or resources.