Mt. St. Helens By admin | May 21, 2009 - 2:38 am |May 21, 2009 Blog, Write On May 18, 1980, the Mount St. Helens volcano in Washington state exploded, leaving 57 people dead or missing. Tweet Pin It Share this:ShareFacebookPinterestRedditEmailDiggTumblrPrintStumbleUponTwitterGoogle +1 Bookmark the permalink.