In 1997 , Adams experienced two slides seven weeks apart that were the largest slides in the Cascades , ignoring the catastrophic landslide eruption of Mount St. Helens , since a slide that occurred on Little Tahoma in 1963 . The first occurred at the end of August and consisted of mainly snow and ice with some rock . It fell from a similar location and in a similar path to the slide of 1921 . The second slide that year occurred in late October and originated high on Battlement Ridge just below The Castle . It consisted of mainly rock and flowed three miles down the Klickitat Glacier and the Big Muddy Creek streambed . Both slides were estimated to have moved as much as of material
landslide eruption of Mount St. Helens
1980 eruption of Mount St. Helens
Mount Adams (Washington)