Mt. St. Helens Pacific Northwest Research Station 333 SW First Avenue Portland, OR 97204
(503) 808-2592
SCORCH
BLOW DOWN
DEBRIS AVALANCHE
MUDFLOW
PYROCLASTIC FLOW
CRATER WALLS
DOME
SPIRIT LAKE
USDA Forest Service - Pacific Northwest Research Station - Mount St. Helens Last Modified: Monday, 18 April 2005 at 13:28:29 EDT