Big Lava Bed Trail Professional Guide
Detailed Trail Description from our Guidebook
"The Big Lava Bed is the home of an old lava flow—magma oozed out of fissures and cracks in the heart of the Lava Bed (as well as along the lower flanks of Mount Adams, in the southern Indian Heaven area, and of course, around Mount St. Helens). The flows began some 9000 years ago and, as Mount St. Helens showed, volcanic activity in the area is still occurring.
The Big Lava Bed is a volcanic formation, but it’s not the classic conical volcano. Rather, it is a 20-square- mile flow of basalt that flowed out of a source vent found in the north-central part of the bed, just south of Goose Lake."