Studying tree rings helped scientists pinpoint when Mount Rainier last sent a lahar down its steep slopes, which could help planners anticipate future mudflows.

The most destructive volcanic eruption in United States history happened less than half a century ago in Washington state. On May 18, 1980, the north side of Mount St. Helens, in southwestern ...

TROUT LAKE — As Pat Arnold plucked weeds from her yard with a view of snow-capped Mount Adams, she navigated around large boulders that hint at the volcano’s destructive past. Over the course of ...

The snowcapped peak of Mount Rainier, which towers 4.3 kilometers (2.7 miles) above sea level in Washington state, has not produced a significant volcanic eruption in the past 1,000 years. Yet, more ...

(CNN) — The snowcapped peak of Mount Rainier, which towers 4.3 kilometers (2.7 miles) above sea level in Washington state, has not produced a significant volcanic eruption in the past 1,000 years. Yet ...

OLYMPIA, Wash. (AP) -- A new report estimates that property losses from a massive mudflow at Mount Rainier could reach $6 billion in western Washington's Puyallup Valley. Major mudflows, known as ...

CAMP MURRAY -- The Washington emergency alert system accidentally sent a warning Friday to all broadcast outlets statewide that a lahar -- a massive, volcanic-caused mudflow -- had occurred. State ...