The overlook is in the middle of the blast zone and located near where David Johnston was killed during the blast. You can view the landslade and blast deposit of ash, the crater where a lava dome has subsequently built. The observatory has material you can view about the history of Mount St. Helens.
References
Page 200 - Dicka, A. B., 2012, 101 American Geo-sites you've gotta see: Mountain Press Publishing Co., 250p.
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