Within Mount St Helens Natl Volcanic Monument
, Lava Canyon Falls plummets over 200 feet. It is by far the biggest and best of the falls along Lava Canyon, or anywhere else nearby. A monument pass is required to park at the trailhead.
There is also an Upper, Middle, and a Lower Lava Canyon Falls.
Go east of Woodland to Forest Road 90. Continue to the Lahar viewpoint and Lava Canyon trailhead.