Communities downstream from Mount St. Helens face ongoing risks as sediment continues to move through the river system, ...

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

Sediment in the Cowlitz River has grown worse in recent years due to a delayed raise of the 36-year-old dam that captures the sediment back on the North Fork Toutle River.

The 1815 eruption produced 60 megatons of sulfur, and as a result, average global temperatures dropped by around 3°C (5.4°F).

CASTLE ROCK, Wash. — City and county leaders across Cowlitz County are raising alarms about escalating flood risks along the Cowlitz River, warning that sediment from Mount St. Helens continues to ...

Volcanoes are now more closely monitored. We have a good chance now of determining when a volcano becomes restless,” says Don Swanson, a volcanologist reflecting on the lessons learned from the 1980 ...

A big, messy surprise greeted Yellowstone National Park early Saturday morning, just as winter officially began. At around ...

The Oso landslide reportedly was the deadliest in U.S. history. And unlike volcanic eruptions or avalanches, risks largely can be avoided. Preventing development in susceptible areas or stabilizing ...

After a year of explosive episodes, the summit continues inflating with fountaining possible as early as Wednesday.

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From the Eiffel Tower's first colors to the original Penn Station, explore how iconic landmarks worldwide looked in the past ...