The 75-m (247-ft) St. Helens bridge on <a href="https://en.wikipedia.org/wiki/Washington_State_Route_504" class="extiw" title="w:Washington State Route 504">State Highway 504</a> after <a href="https://en.wikipedia.org/wiki/1980_eruption_of_Mount_St._Helens" class="extiw" title="w:1980 eruption of Mount St. Helens">May 18 eruption</a> of <a href="//commons.wikimedia.org/wiki/Mount_St._Helens" title="Mount St. Helens">Mount St. Helens</a> when it was washed out by the mudflow on the <a href="https://en.wikipedia.org/wiki/Toutle_River" class="extiw" title="w:Toutle River">North Fork Toutle River</a>. This steel structure was carried about half km (quarter mile) downstream and was partially buried by the mudflow. Man for scale by bridge girder.
R.L. Schuster, <a href="https://en.wikipedia.org/wiki/United_States_Geological_Survey" class="extiw" title="w:United States Geological Survey">United States Geological Survey</a>
<a rel="nofollow" class="external text" href="https://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Mount%20St.%20Helens%20-%20PP%201250%20%20136">Mount St. Helens - PP 1250 136</a> (original)<br><a rel="nofollow" class="external text" href="https://www.usgs.gov/media/images/st-helens-bridge-highway-504-was-carried-over-a-quarter-mile">The St. Helens bridge on Highway 504 was carried over a quarter-mile</a> (alternative)