On October 18th, 1980, a third dome started growing at Mount St. Helens. This October dome was 112 feet (34 meters) high and 985 feet (300 meters) wide, making it taller than a nine-story building and wider than the length of three football fields. This aerial view is from the north.
Terry Leighley
1980-10-24
<a rel="nofollow" class="external text" href="https://vulcan.wr.usgs.gov/Volcanoes/MSH/SlideSet/ljt_slideset.html">USGS Cascades Volcano Observatory</a>