Native salmonids (Rainbow/steelhead trout, Bull Trout, Dolly Varden) populations in the upper Skagit River have a complex evolutionary past shaped by geology, hydrology, and human actions. In our latest research study funded by City Light, we’re using genomic tools to unravel the history of Rainbow and Bull Trout in the upper Skagit River basin. Topics include, how do the genetic relationships among fish correlate with the geologic history of the North Cascades Range? Have past glaciers and altered connections among rivers influence their genetic connectivity? Have more recent hatchery introductions affected their genetic diversity? Stay tuned as we trace these trout’s genetic identities to better understand these important species in their native habitats.

Our recently completed genetic assessment found the native salmonids in the upper Skagit River were distinct from fish below the lowest Dam at the Skagit Gorge. These recent observations motivated the current study we are leading. Currently, our team is meeting with project collaborators to establish the key questions of interest and how those questions are to be answered. Importantly, the approach has consensus among colleagues involved. 

While the study’s purpose is academic in nature, the information is envisioned to inform City Light’s ongoing stewardship responsibilities in the Basin. Further, with anadromous (ocean going) salmonid reintroduction as a potential policy action, understanding the origins of fish present and the genetic implication of non-volitional passage is important for sound stewardship. 

Working on projects related to the upper Skagit River for City Light has been rewarding. We thank everyone that has been involved, HDR for bringing us on as technical experts and City Light for supporting us. Look out for future project updates.