The canyon was carved primarily by lahars, which are volcanic mudflows consisting of water, rock, and debris, during the 1980 Mount St. Helens eruption.
The 130-foot suspension bridge crossing the canyon offers a direct view of the Muddy River's whitewater cascade.
The trail network includes a high-difficulty section that requires physical agility, specifically navigating a rock face with hand cables.
The Muddy River is a direct drainage for the Shoestring Glacier on the southeast side of Mount St. Helens.
The paved portion of the trail provides a barrier-free viewing area of the upper canyon reaches.
Lava Canyon Trailhead serves as the primary access point for exploring the steep, narrow gorge carved by the Muddy River on the southeast flank of Mount St. Helens. The area features a dramatic multi-tiered waterfall system formed by historic volcanic lahars and subsequent erosion. Hikers can choose between an accessible paved loop or a challenging trek that features a cable-assisted traverse and a 130-foot suspension bridge over the river. The canyon walls display exposed basalt layers and unique geological formations resulting from the 1980 eruption debris flows. High-angle terrain and narrow passages characterize the mid-to-lower sections of the trail system. Vegetation in this zone represents early succession forest regrowth following volcanic disturbances.
The center of the suspension bridge provides a panoramic perspective of the canyon's vertical basalt walls and the waterfall drop.
Wear high-traction hiking boots, as the volcanic rock and stair sections can be exceptionally slippery when wet.
Trekking poles are highly recommended for the canyon's steep elevation changes and uneven volcanic terrain.
Carry a physical map or GPS device, as cell service is non-existent within the canyon floor.
Do not attempt the lower canyon suspension bridge loop if you have a fear of heights or limited mobility, as the terrain is steep and exposed.
Trail access is seasonal and highly dependent on winter snowpack; roads leading to the trailhead typically open in late spring or early summer.
Stay strictly on marked paths to protect the fragile, recovering volcanic soil and ensure personal safety in steep terrain.
