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

‘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.

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

With facilities at risk of collapse under the strain of climate change, nations say much more federal funding is needed for upgrades and repairs.

Due to chemical pollution, the treaty-protected fish in the Columbia River Basin pose health risks for Indigenous tribes.

Without passageways to cross dams along the Columbia, salmon are dying. Tribes say the U.S. government isn't cooperating as they try to help the fish recover.

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.

After two decades and $2 billion in spending, the U.S. government's promises to Native tribes to boost fish populations in Oregon and Washington haven't held up.

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.