Seymour River Rock Slide Mitigation Proje ject To restore migration - - PowerPoint PPT Presentation
Seymour River Rock Slide Mitigation Proje ject To restore migration conditions for all species in the Seymour River that existed before the 2014 rockslide, in a safe and sustainable manner. Outline Background Project summary
“To restore migration conditions for all species in the Seymour River that existed before the 2014 rockslide, in a safe and sustainable manner.”
truck
2014
debris
upstream by 10 meters
fish migration.
current
hours
engineering report.
selected mitigation
ceremony – August 24, 2016
Why do we need to move fish?
productive habitat above the slide.
cover and off channel habitat below.
coho and steelhead populations.
Above Above Below
Fence construction:
hours
Installing anchors Building the panels Installing the fence
August 6, 2016
daily operations: ➢Squamish Nation ➢Tsleil-Waututh Nation ➢Seymour Salmonid Society
From fence - 2016: Fish moved above slide:
Total: 335 From fence - 2017: Fish moved above slide:
Total: 304
The fence made a barrier in late summer, at very low flows. Creating ideal conditions to seine the pool directly downstream. The results of 6 weeks of seining from August 30 to November 6:
Trap and Truck Seining Program 2017 Species Broodstock Release Total pink salmon 334 334 summer steelhead 25 29 54 coho salmon 276 1,777 2,053 chum salmon 67 67 Total 2,508
➢Gastric tags ➢Tagged and released at fence ➢No adults detected above slide in 2017
➢Surgically implanted ➢Coho smolts at hatchery ➢87% survival downstream of slide in 2017
Before After
the mid portion of slide
June 2015 September 2017 Prior to rock breaking work After year 2 of rock breaking work
summer of 2018.
after Spring freshet.
least 5 years.