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Engineers work to replace machinery, prevent flooding and maintain antiquated equipment all while minimizing disruption at America’s busiest locks.

As the state considers removing the species’ endangered status, some argue that the Colville Tribe’s recent population estimate is implausibly high.

“Recovery is happening right before our eyes.” The species grew by 20% in WA last year, but advocates warn against declaring victory too early.

‘Forever chemicals’ linked to ailments from high cholesterol to cancer are in our clearest aquifers — but steep costs pose cleanup challenges.

Driven by climate change, more frequent blazes may change the way we hike, ski and camp.

Starting in 2025, local governments will need to consider emissions and natural disasters in their long-term planning. Some already do.

The pollution poses a threat to the Portage Bay shellfish beds of the Lummi Nation and raises health concerns for valley residents.

Is it hard to go carless around the Sound? One frequent rider shares how to navigate one of the nation's busiest transit systems.

For decades, the Arlington radio station has helped the U.S. military communicate with its submarine fleet. It's also one of Russia's top nuclear targets.

Doing the work to make old buildings more energy efficient isn’t as sexy as filling our roads with electric cars, but these smaller efforts are making a difference.