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Keywords: St Helens in September 1980.jpg After the May 18 1980 eruption Mount St Helens' elevation was only 8364 feet 2 550 meters and the volcano had a one-mile-wide 1 5 kilometers horseshoe-shaped crater seen here from the northwest September 16 1980 by Thomas J Casadevall USGS Mount St Helens in September 1980 after the May 18 eruption http //vulcan wr usgs gov/Volcanoes/MSH/SlideSet/ljt_slideset_old html U S government PD PD-USGov 1980 eruption of Mount St Helens |