#MSH45 | The Buried Valley / Scenes of Blowdown The May 18 debris avalanche didn’t just collapse the north flank of Mount St. Helens—it transformed the North Fork Toutle River valley. This USGS footage from May 28, 1980, follows the path downslope. Some stats about the debris avalanche: 🔻 Traveled 14–17 miles in under 10 minutes 🔻 Buried 23 square miles (60 km²) 🔻 Reached depths up to 600 feet (180 m) 🔻 Volume: 2.5 km³ (0.7 cubic miles) of rock, ice, and forest debris It carried everything:
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