Tacoma Narrows

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Tacoma Narrows

• Acoustic Tracking Line
• 2007

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Acoustic Sensor Placement
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Acoustic Sensor Placement
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Study Objectives

• Migration Routes
• Migration Timing
• Potential Interactions/Competition
• Relative Mortality

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Deschutes River ChinookWDFW
1
1
14
32
40
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Deschutes River SteelheadWDFW
1
1
3
1
14
15
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Netpen Hatchery CohoSquaxin Island Tribe
46
3
92
1
22
13
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Netpen Hatchery CohoMigratory Corridors
67
14
86
33
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Days Detected After Release
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Netpen Hatchery CohoHolding Areas
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Cooperative Studies

• Nisqually River Steelhead
• South Puget Sound Cutthroat Trout
• Lingcod

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Narrows Other Detections

• Six Gill Shark
• Seven Gill Shark
• Squid
• Steelhead
• Chinook
• Lingcod

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Coho Hold
2006
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Two Phases

• 1. Modify the new Tacoma Narrows Bridge to accept
  acoustic receivers for future studies
• 2. Retrieve 2007 Narrows receivers

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Phase 1
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Phase 2
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Benefits From Bridge Location

• Mounts are designed to be long lasting
• Shallow enough to be maintained by recreation
  divers (shallow)-Tribal, South Sound Dive Club,
  Tacoma Dive Schools
• Educational component on WSDOT Bridge mitigation
  website

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• 2008Proposed South Sound
• Wild Coho - 4 South Puget Sound Streams- Mill and
  Goldsborough- Hammersley Inlet Sherwood-Case
  Inlet Deschutes- Budd Inlet
• Netpen Coho- Peale Passage
• Wild Steelhead- Nisqually River

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Release Sites
2006
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Future Studies

• South Sound
• All wild and hatchery stocks tagged to identify-
• Spatial bottlenecks for survival
• Holding areas
• Migratory corridors

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Data Uses

• Prioritize restoration and preservation
  opportunities by affected population
• Hatchery release practices-timing and s
• Input to ecosystem based models
• Input to capacity models
• Input to life history models-FRAM assumes linear
  mortality

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Letters of Support

• Nisqually Tribe
• Squaxin Island Tribe
• Puyallup Tribe
• WDFW
• WDOE
• UW
• Evergreen State
• NOAA
• NWIFC
• ACOE