This road guide is a tour of Mount St. Helens volcano and vicinity, with emphasis on the effects and deposits of the 1980 eruption. The road log starts from the U.S. Geological Survey's David A. Johnston Cascades Volcano Observatory, Vancouver, Washington. This road guide is intended mainly for use by individuals with a background in geology, although parts of it may be useful to the layman. The guide is organized around two primary routes. -- Doukas, 1990 |