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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.

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.

Policymakers and homeowners are scrambling to manage so-called 'wildland-urban interface' to mitigate the threat.

A new study concludes that climate-boosted wildfires are significantly altering carbon monoxide levels in the region — and the effects reach far beyond the Cascades.

Storm-related sewage spills dump about 93 million gallons of chemical discharge a year into Puget Sound.