The Center for Biological Diversity is petitioning the U.S. Fish and Wildlife Service to add two plants native to Palouse and Camas Prairies to the Endangered Species Act list.

A district in Cowlitz County was key to flushing out the corrosive chemical spill that threatened to contaminate Longview's drinking water after a catastrophic tank implosion.

Biologists at the University of Washington have been testing equipment used in large-scale concrete pours on shrimp-filled mudflats in southwest Washington.

Representatives with Washington businesses and government agencies recently visited Texas for a closer look at how the Lone Star state has become a leader in clean energy.

The Yakima River Basin project aims to provide gentler and more adaptable fish passage as snowpack melts and the climate warms.

Along Commencement Bay in Tacoma stand small, cedar-clad boxes. These tiny dwellings, hoisted about 16 feet above the ground, are new nesting boxes for purple martins.

This year, all of Washington is experiencing drought, after a wet winter scuttled by warmer temperatures, according to state officials.

The Northwest Stream Center in Everett spans 25 acres with two salmon streams, wetlands and a popular nature walk. The nonprofit wants to raise $2.5 million to expand.

Hundreds of thousands of birds are flying over Washington nightly. People can help these feathered travelers survive many perils, from cats to bright lights to windows.

The Stillaguamish Tribe in Washington state has been buying land in its traditional territory and removing levees. The goal is to turn farmland into wetlands with the hopes of restoring Chinook salmon.