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GoldsboroughGoldsborough DamDam RemovalRemovalNear Shelton, Washington Near Shelton, Washington
Compiled byCompiled byKen Ken KozmoKozmo BatesBatesDoug Lantz, TetraDoug Lantz, Tetra--TechTechJim Fraser, WDFWJim Fraser, WDFW
ConstructedConstructed 19211921
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caca 19291929
AprilApril, 20012001
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MayMay, 20012001
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SeptemberSeptember, 20012001
GoldsboroughGoldsborough CreekCreek
•• Upstream of damUpstream of dam–– 60 sq miles of watershed60 sq miles of watershed–– 24 miles excellent low 24 miles excellent low
gradient rearing habitatgradient rearing habitat•• Expected anadromous species Expected anadromous species
adult passageadult passage–– Coho Coho -- 2,0002,000–– Chum Chum -- 10,00010,000–– Chinook Chinook –– (threatened)(threatened)–– Steelhead, seaSteelhead, sea--run cutsrun cuts
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GoldsboroughGoldsborough DamDam
• Initially built in 1921 for power, RM 2.3• 1 mile upstream of City of Shelton• Initially 8 – 14 feet high• Built on Kitsap clay – channel incision accelerated by
bed material depletion• Damage, not useful after 1996 flood damage• 35 feet high, 100 feet wide when removed in 2001
DamDam RemovalRemoval PartnersPartners
Corps of Engineers• Design• Section 206 - 65%
cost $2.8M• Final design by Tetra-
Tech
Washington Department of Fish and Wildlife
• Sponsor• $1.4M - Legislative
appropriation
Simpson Timber Company• Owner-operator by MOU with state• $148k dam removal and real estate• Conservation District
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DesignDesign / Construct/ Construct IssuesIssues
• Passage for all species, life stages• Rigid channel chosen
– Minimize flood hazard risk in City of Shelton – Manage headcut potential
• Kitsap formation clay• Wetlands• Railroad trestle• Cost
Railroad Trestle
Existing Dam
Wetland
Wetland
Weir Structure
Begin Project
End Project
Steep Banks
Kitsap Layer
Natural Gas line Crossing
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Project slope = 0.021
Cut: 27,000 cy
Fill: 40,000 cy
Profile of Goldsborough Creek
Construction bypassConstruction bypass2000 feet300 cfs capacity
summer flood of recordDownstream juvenile passage
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SoldierSoldier PilesPiles35 weirs35 weirs527 piles 527 piles -- Drive / drillDrive / drill
PrecastPrecast concreteconcrete panelspanels
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FishFish passagepassage weirweir crestcrest– cast in place, streambed
shape
DebrisDebris
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BankBank protectionprotection –cut and fill slopescut and fill slopes
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UpstreamUpstream headcut headcut ––At top of projectAt top of project
88.0
89.0
90.0
91.0
92.0
93.0
94.0
95.0
96.0
0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 100.0
2001 Pre-project
2002(Weir)
330’ above project330’ above project
90
91
92
93
94
95
96
97
0.0 10.0 20.0 30.0 40.0 50.0 60.0
2001 Pre-project
2002
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1360’ 1360’ above above projectproject
102
103
104
105
106
107
108
109
110
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0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0
2001 Pre-project
2002
Project slope = 0.021
Profile of Goldsborough Creek
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PassagePassage conditionsconditionsnear fish passage near fish passage
design flowdesign flow
TenTen--Year Monitoring PlanYear Monitoring Plan
• Pre and post smolt monitoring
• Downstream passage through the project
• Fish passage snorkeling observations, radio tracking if necessary
• No juvenile passage monitoring
• Construction compliance -survey, veg plats, photos
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Habitat MonitoringHabitat Monitoring
• Pre-project and post (?) habitat evaluation – upstream, downstream
• TFW ambient monitoring protocol – 5 km
• Benthic Index of Biotic Integrity • Spawner surveys
O&M AgreementO&M Agreement
• Duration: for life of project – 100 years• Annual and post-flood inspections and surveys
– fish passage– Habitat features
• Repair as necessary• $7500 / year funded by Simpson Timber Company
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MonitoringMonitoringcamerascameras
Project dedication dayProject dedication day
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4 days later4 days later
1010--yr flood eventyr flood event