The waterways of the Pacific Northwest run deep. They unify the region that includes Idaho, Oregon and Washington by connecting the glaciers of its high volcanoes to its fertile valleys to the Pacific Ocean. Water coursing through streams and rivers is the lifeblood critical to urban and agricultural uses and to the vitality of aquatic ecosystems. Many iconic fish species in Idaho and the region such as salmon, steelhead, Pacific lamprey, bull trout and other native trout species, depend upon cool and plentiful stream flows to survive. But climate change is causing many stream flows to respond differently than they have in the past.
A changing climate is already bringing warmer air temperatures, an increasing proportion of winter precipitation falling as rain, earlier snowmelt and reduced spring snow pack. These changes all manifest in stream flow responses with decreased base flows, rising summer water temperatures, and more frequent winter flooding from rain-on-snow events.
“The complex work of conserving and recovering fish populations in the Pacific Northwest has grown substantially more challenging in light of our changing climate – this has become increasingly clear in the last several years with recent scientific assessments and projections,” said Dan Shively, the U.S. Fish and Wildlife Service’s Regional Fish Passage and Habitat Partnerships Coordinator. “Robust and diverse fish communities require healthy watersheds and habitat; or more simply put, an abundance of cool, clean water."