Highway 504 Bridge across Hoffstadt Creek

The high Highway 504 Bridge spans Hoffstadt Creek, 370 feet (113 meters) below. This area is near the western limit of the zone affected by the 1980 blast. From here east, all but the strongest trees or those in the lee of ridges were blown down. Mounds composing the far end of the debris-avalanche deposit are visible to the south in the valley bottom.

-- Excerpt from: Pringle, 1993, Roadside Geology of Mount St. Helens National Volcanic Monument and Vicinity: Washington Department of Natural Resources, Division of Geology and Earth Resources Information Circular 88