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3,000 years of Ice Age activity shaped Pateros in Central Washington where the Methow River meets the Columbia.

Non-native plants are crowding out native ones in the Pacific Northwest and posing new challenges for the organizations that manage them.

The mountain’s namesake granite was used to build Seattle’s iconic Smith Tower and is coveted by climbers. But its peak is made of a much older rock.

The river's dams drive electricity, flood control and commercial ships, and also helped turn the desert east of the Cascades into fruitful land.

North of Washington’s Gorge Amphitheatre are two massive lake-filled canyons, and geologists have chased clues about their origins for centuries.

Voters passed Initiative 2066 in November, but opponents, including King County and the city of Seattle, allege it violates the state constitution.

The famous flower fields are connected to mudflows that spilled from Washington’s Glacier Peak less than 15,000 years ago. Could it erupt again?

Washington and Oregon are two of six states where humans have tested positive for avian flu, but researchers suspect there are more unreported cases.

About 15,000 years ago, Washington was covered by a massive sheet of ice. As it melted, it helped shape the state into the landscapes we know today.

Mayor Lisa Brown is calling for another study to assess the risks of transporting 2,000 gallons of radioactive liquid from Hanford to Utah and Texas via I-90.