How many adult salmon return to Miller and Walker Creeks in Burien, Normandy Park, and SeaTac each year? How many coho salmon are dying from polluted water before they have a chance to spawn?

We are finding out, thanks to many dedicated volunteers. As we learn how many of these fish are stricken by pre-spawn mortality each year, we find out how many survive long enough to lay the eggs of the next generation. Coho pre-spawn mortality has been linked to polluted road runoff – and the good news is, filtering polluted stormwater through soils made of sand and compost makes it non-toxic to fish!

A better understanding of the numbers of fish returning to the streams in the Highline community and the extent of pre-spawn mortality is one of the top recommendations the community identified as part of coordinated monitoring of the streams (see the 2009 monitoring coordination recommendations). Adult salmon in our streams are the Pacific Northwest equivalent of the “canary in the coal mine” – they reflect the health of our lands and water. This important data is helping us make priorities for the watershed and track our progress.

For more info, or to apply, click here.

The Community Salmon Investigation has collected salmon data since 2010 to help us learn more about this community resource.

Abundance_2019Salmon returns to Miller and Walker Creeks (2010-2019).
PSM_2019aPre-spawn mortality observed in Miller and Walker Creeks (2010-2019).

Miller-Walker Survey Findings:

10-Year Highlights
2019 Summary Results

2018 Summary Results
2018 Results Presentation

2017 Summary Results​
2017 Results Presentation

2016 Summary Results
2016 Results Presentation

2015 Results Presentation
2015 Summary Results

2014 Results Presentation

2013 Results Presentation

2012 Results Presentation
Video of coho salmon exhibiting PSM Symptoms

2011 PSM Data
2011 Results Presentation
Video: Coho Walker Creek, Nov. 11, 2011

Program Materials

Stewardship of the Miller/Walker Creeks basin is jointly funded by the City of Burien, City of Normandy Park, City of SeaTac, King County, and the Port of Seattle.