June-October 1980 New Dome FormsJune 13, 1980Aug. 27, 1982 National MonumentAugust 27, 1982 September 1980 Timber Salvage Weyerhaeuser Co. begins salvaging some of the 62,000 acres of timber and young plantations damaged by the blast. MtStAdmin Related postsJuly 13, 2008July 13, 2008 Eruptions EndRead moreFebruary 13, 2008Early 2008 Dome BuildingRead moreMay 13, 20052005 – Present Seismic Activity ResumesRead more Leave a Reply Cancel replyYou must be logged in to post a comment. This site uses Akismet to reduce spam. Learn how your comment data is processed.