Steelhead Haven
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The Steelhead Haven Landslide Fine Sediment Reduction Project aimed to reduce fine sediment inputs into the Stillaguamish River from a landslide, which was a major factor in the decline of Chinook salmon populations to 8% of historic levels. The project involved constructing a 1,300 foot long, 25 foot high log cribwall with ballast blocks to stabilize the landslide and store sediment, improving habitat for over 30 river miles. Initial designs were impacted when the landslide failed before construction in 2006. The final design was more engineered to withstand river forces and allow for channel migration over time while maintaining sediment storage and stabilization of the landslide.
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We are pleased to introduce you to Maccaferri Double Twist Steel Wire mesh, and provide an overview of our products and related solutions that are engineered from it.
The ‘double twist’ connection locks the wires together: it is more flexible, stronger and has greater punch resistance than other mesh types.
Compliant with International Standards (EN, ASTM, SANS, NBR, etc).
Certified by Third-parties (CE Marked, BBA Certified, etc).
As always, our technical teams are ready to support your project queries.
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Officine Maccaferri Spa: Double Twist Products 2016
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Steelhead Haven
- 1. Steelhead Haven Landslide Fine Sediment Reduction Project Tracy Drury, PE Anchor Environmental L.L.C. Pat Stevenson Stillaguamish Tribe of Indians
- 2. Stillaguamish Tribe’s Interests Chinook Populations at 8% of historic levels Fine sediments inputs was determined to be a major contributing factor Success would improve habitat conditions for more than 30 miles downstream
- 3. Steelhead Haven Landslide 2004
- 6. Project Planning Prioritized in the Chinook recovery plans, 1990, 2000, 2005 Began community involvement / public outreach, 1995 Evaluated in the Corps Ecosystem Restoration Plan, 2000 Conceptual Designs Developed, 2001 Funding for design and construction: Salmon Recovery Funding Board (500K) and Centennial Clean Water (500K), 2005
- 7. Project Design Design conducted, 2005-06 Objectives Maximize sediment storage Promote long-term stabilization of the slide Improve in-stream habitat conditions Constraints No increase in flood impact to the local community
- 9. Slide Failure: January 2006
- 10. Backwater at low flow
- 15. January 29th 2006 Channel we cleared Flow through the trees Where the river wants to go
- 18. Creek Draining the Slide
- 19. Creek Mixing with River
- 20. Project Design Design conducted, 2005-06 Objectives Maximize sediment storage Promote long-term stabilization of the slide Improve in-stream habitat conditions Constraints No increase in flood impact to the local community
- 21. River 2D Hydraulic Model Output - Depth
- 22. River 2D Hydraulic Model Output - Velocity
- 23. Expected Change Log Cribwall Placement Expected Channel Migration Expected Head cut
- 24. Temporary Bridge
- 25. Isolating the River From the Construction
- 26. Log Cribwall 1300 feet long, 25 feet high
- 27. Ballast Blocks Approximately Every 50 Feet
- 28. Backfilled With Woody Debris
- 29. What the River Will See
- 30. Approximately 20 Acre-feet of Storage
- 33. Channel Migrated Toward the Structure
- 35. Take Home Messages Landslide failure forced redesign to be more highly engineered placement Constructability was a major decision making factor The structure was designed to deform and settle as the river undercuts it’s face Thorough analysis and communications prior to the failure facilitated permit acquisition after the failure
- 36. Steelhead Haven Landslide Fine Sediment Reduction Project Tracy Drury, PE Anchor Environmental L.L.C. Pat Stevenson Stillaguamish Tribe of Indians