Fish Need Clean, Abundant Water

Areas east of the Cascade Mountains average only about 8 inches of rain a year. The ridgetops and high-elevation forests are largely intact and are the primary source of snowpack, which feeds cool, clean water to the rivers, especially during the summer. Making sure this water stays clean and abundant for fish downstream is one of the priorities in this region. Several streams are listed as impaired because the water is too warm and some areas experience drastically low flows in the summer when water is withdrawn to irrigate farms. The trends in the region during the past several decades indicate that low summer flow will continue to be a challenge.

View data on Water statewide. Visit the Salmon Data Hub for more of the data behind the indicator charts and graphs used throughout this site.