Thunder Knob Trail

EASY 17 reviews

Thunder Knob Trail is a 3.5 mile moderately trafficked out and back trail located near Marblemount, WA that features a lake and is good for all skill levels. The trail is primarily used for hiking, walking, nature trips, and birding and is accessible from March until November.

3.5 miles 694 feet Out & Back

kid friendly

birding

hiking

nature trips

walking

forest

lake

views

wild flowers

19 days ago

View of Diablo lake at top is awesome, easy hike a little elevation gain. my 11 year old & 70 year old mother nature law stopped half way up. I jogged up the rest with my husband so we could see the views.

backpacking
2 months ago

2 months ago

2 months ago

hiking
3 months ago

hiking
4 months ago

hiking
4 months ago

I took my eleven year old son and my 3 year old lab. Perfect length and elevation gain for minimal complaining. :) beautiful view of the lake from the top. Well maintained trail.

hiking
5 months ago

The Thunder Knob trail presents a cool, relatively easy trail with a consistent but gradual incline, and results in some rather grand views of an already pristine area.

The trail begins at the north loop of the Colonial Creek campground. It immediately takes you over and across Colonial Creek, which with the recent late Spring thaws, was rather powerful. After crossing the creek you're taken through a gorgeous old growth forest and eventually you start to climb various hillocks and rises until you reach the trail's end.

At one point about halfway through there is an absolutely gorgeous promontory, looking out against Colonial Peak and a heavily wooded valley. It's an ideal resting place for sure.

Eventually, the trail dips down past the hidden Thunder Lake (which is really a long pond), and rises up again to end at the eponymous Thunder Knob, which overlooks Diablo Lake. Rest here and absorb all that this perfect vision of nature has to offer, and then return to the trailhead, knowing that the way back is much, much easier.

hiking
1 year ago

Nice trail and relatively easy hike. Good views of Diablo Lake along the way.

hiking
1 year ago

Thunder Knob is a cool trail in the Diablo/Ross lake area. The hike has a little of everything from mountain creeks to an old growth forest covered in moss, and an alpine woods at 1800 some odd feet. Easy walk to stretch your legs after a trip on Rt. 20 that will not disappoint.

1 year ago

hiking
1 year ago

The Forest Service has installed the foot bridges. They have built new sturdy ones, but don't have the rustic character of the old ones. We started the hike around 6 pm, for a nice evening hike. The water level in the streams was very low for this time of year, the wildflowers are just starting to bloom, the mountains were majestic and Diablo Lake was stunning as always. We were able to just soak up the beauty from the top and enjoy the company of our group.

hiking
2 years ago

The trail itself was great and well maintained. It was a slow gradual climb all the way to the top, not very difficult. There were a few nice views of the surrounding high mountains/ waterfalls about half way up. At the top there was one nice view of Lake Diablo looking towards the dam. The two other viewpoints at the top were okay but obstructed by trees. My 3 yr old made it to the top with no problems but had to be carried down. Overall a nice hike on a nice day but the trail was very crowded but considering it was Saturday of the 4th of July what did I expect.

hiking
2 years ago

This was a nice hike. It had a lot of wildflowers blooming. The trail gradually, but steadily increases elevation until the top when there is a grand view of Diablo Lake. There were down trees on the trail, but easy to go over. Sadly, towards the top of the trail is many dead and dying trees (looks like the beatle infestation they have further up the pass).

hiking
3 years ago

Just completed this with the family this weekend and we were sold after the log bridges over the creek. The climb was steady but mild throughout with no steep drop offs or overly intense climbs, making it a great match for our 4 year old. She was able to do it all on her own, which she was so proud of! The views at the top of Diablo Lake made it totally worthwhile and there were several viewpoints along the way to stop and let our 2 year old down to play and explore. We also really liked the change in elevation as it gave us a teachable moment about the forest canopy and the dried out creek bed and mini meadow/pond were great sparks for the curiosity of toddlers.

hiking
4 years ago

Nice easy hike to do with kids and you get great views of Diablo lake and the surrounding peaks. One the way to the top there is a little pond and my son was able to gently catch a Northwest Tree Frog. A wonderful day in the mountains.