REPORT:
Road Guide to Volcanic Deposits of Mount St. Helens and Vicinity

• In HTML Format
  • Abstract
  • Table of Contents

• Report Link
  • Report -- Link to: USGS Publications Warehouse

• Selected Excerpts
  • The Eruption of May 18, 1980
  • Summary of Volcanic History of Mount St. Helens, with Road Guide Information

• Selected Maps and Graphics

  • [Map,20K,InlineGIF]
    Southwest Washington - Northwest Oregon
    -- Modified from: Doukas, 1990
    

  • [Map,40K,InlineGIF]
    Southwest Washington, showing field-trip routes to Mount St. Helens
    -- Modified from: Doukas, 1990
    

  • [Graphic,20K,InlineGIF]
    Generalized N-S Geologic Cross Sections: Generalized north-south geologic cross sections through Mount St. Helens. Top, Young summit dome (dacite) and surface flows (stippled areas) overlie older (more than 2,500 years) dacitic pyroclastic flows, lava flows, and domes. Geology generalized from C.A. Hopson (written commun., 1983) and Glicken (1986). Dashed line, approximate outline of 1980 crater floor. Bottom, Preeruptive summit dome. Roman numerals denote main-slide blocks of avalanche; blue arrows indicate direction of failure. Dotted line, pre-1980 surface; long-dashed line, presumed outline of intruding magma in 1980; short-dashed line, approximate outline of 1980 crater floor.
    -- Modified from: Doukas, 1990

  • [Graphic,12K,InlineGIF]
    View West from Windy Ridge
    -- Modified from: Doukas, 1990
    

• Other Menus of Interest
  • Mount St. Helens - Points of Interest -- CVO Menu
  • Bibliography of Road Guide and Field Trip Publications -- CVO Menu

• How To Order This and Other USGS Publications