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and SeaTac each year? We are finding out, thanks to many dedicated volunteers. In addition, we are learning how many of these fish are stricken by pre-spawn mortality each year, and thus how many survive long enough to lay the eggs of the next generation.
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.
Salmon Monitoring Results in 2014 - New!
Final 2014 Salmon Survey Presentation for CSI: Highline (Adobe PDF, 16 MB)
In fall 2014, 37 volunteers took turns conducting daily surveys starting on October 8 and ending January 9, 2015. Volunteer teams in 2014 reported seeing the following live adult salmon:
Coho (live): 78
Estimated escapement (population of spawning fish): 80 coho and 29 chum
Carcasses: 70 coho, 26 chum
Coho pre-spawn mortality rate: 83% - this is the percent of returning adult coho females who died before spawning, and did not show evidence of having been attacked by a predator. Pre-spawn mortality in coho has been shown to be caused by untreated road runoff.
See the bottom of this page for the training slides, survey plan, data form, and participation form.
Salmon Monitoring Results for 2013
Final 2013 Salmon Survey Presentation (Adobe PDF, 16 MB)
Volunteer monitoring teams in 2013 reported seeing the following adult salmon (last updated 4/8/2014):
Salmon Monitoring Results for 2012
Final 2012 Salmon Survey presentation (PDF, 16.3 MB)
Volunteer monitoring teams in 2012 reported seeing the following adult salmon (last updated 3/15/2013):
Fall 2011 Salmon Survey Results Presentation (Adobe PDF - large file)
Volunteer monitoring teams in 2011 reported seeing the following adult salmon:
The first coho of the 2011 fall sapwning season was seen on October 12 in Miller Creek, and the last live coho was reported on December 11. The first chum was seen on November 13 in Walker Creek. Chum were still making their way upstream to spawn on the day of the last survey, and are expected to spawn in these streams until sometime in January.
Carcass and spawning status information reported for coho:
Pre-spawn mortality data 2011 (11/9/11 version) (Adobe PDF)
Youtube video of live coho in Walker Creek on November 20, 2011. Courtesy of D. Bobanick.
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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. On behalf of the partners, this page is proudly hosted by King County Department of Natural Resources and Parks - Water and Land Resources Division.