Goldsborough Dam Removal Near Shelton, …rrnw.org/wp-content/uploads/Bates_Ken.pdfGoldsborough Dam...

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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

111

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