Total Ascent: 5600ft
Highest Point: 8365ft
Total Distance: 10.6 miles
Location: N 46° 7.8397, W 122° 10.2888
Required Permit: Northwest Forest Pass; Climbing Permit
Difficulty: Hard
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Known in native languages as Louwala-Clough or “smoking mountain”,
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Beginning at the Marble Mountain Sno-Park at 2700ft, the Worm Flows route follows cross-country ski routes through still-recovering forests of Douglas fir rising out of the ash amongst bleached stumps and fallen logs. The fairly level path is lined with underbrush of huckleberry and mountain blueberry that quickly gives way to bear grass and wildflowers as the forest cedes ground to rockier terrain. At two miles the trail breaks away from the forest at Chocolate Falls, a small 40ft fall along Swift Creek. At this point the trail becomes more serious, making the falls an ideal place to change out gear and take a break before fording the creek and continuing up the mountain in earnest.
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The trail deposits you on the rim of a crescent-shaped crater framing a dramatic view of Spirit Lake and Mt. Rainier. Below, in the bottom of the caldera, the lava dome burps clouds of steam and sulfur into the air. For the adventurous, continue west along the rim to the true summit, which requires something of a descent before trudging back up to find a rough mound of rocks piled up at the 8365’ point. Take in the expansive views, absorb firsthand how much of the mountain is truly gone, then gear up for the descent. With snow present year-round, some controlled glissades down the steep slopes will save both time and your
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While this route is a bit challenging, it is a non-technical climb. Experienced and prepared hikers should not have too much difficulty attaining St. Helens’ heights. The alien and engaging landscape created by this active stratovolcano vies for attention against an abundance of great views of the surrounding environs, making the trip well worth the effort. Worm Flows is also a nice introduction to hiking larger summits, and the exposure to climbing steep snow fields and negotiation of glaciers make this a great training hike for an ascent of Mt. Rainier.
To get there take I-5 to Exit 22, Dike Access Road. Head right under the freeway keeping right to merge onto Old Pacific Highway, then staying right to merge onto E Scott Ave before connecting with WA-503 also known as Lewis River Road. Continue on WA-503 into the shadow of St. Helens, taking a left onto Forest Road 81 toward the Ape Caves. Veer right on Forest Road 83 toward Marble Mountain Sno-Park and find the trailhead in the parking lot. - Nathan
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