5. River System Formed in Nine Hours. The landslide of May 18 had buried the river and highway to Spirit Lake to an average 45m. It also buried most other drainages in the 60 square km of the Upper Toutle Valley and plugged the valley's mouth.
Pia mitaro katika kilomita 60 mraba ilizikwa kwenye bonde la juu la Toutle na kuziba chanzo cha bonde.