KGW-TV Portland on MSN

Mount St. Helens eruption still causing issues for Cowlitz River 45 years later

City and county leaders in Cowlitz County say sediment from the Mount St. Helens eruption on May 18, 1980 is causing flood concerns.

Cowlitz River sediment from Mount St. Helens raises flood risk, officials say

City and county leaders across Cowlitz County are raising alarms about escalating flood risks along the Cowlitz River, ...
tdn.com

Majority of MSH sediment is passing Toutle dam. So feds plan to raise crest next year.

Previously, the dam prevented 80% of sediment from the 1980 Mount St. Helens eruption from flowing past it, and into the rivers downstream of the North Fork of the Toutle ...