4. A Success Story!
⢠Order of magnitude increase in coho smolt production
(103
â 104
, ~29,000/year)
⢠Now #
2 producer in South Puget Sound
⢠Only Puget Sound system with recent production increase
⢠Mostly because dam removed in 2001
⢠Opened > 25 miles of stream channel habitat
⢠Wasnât always this wayâŚ.
8. The Good!
⢠Impervious surface = ~8%, < above Shelton
⢠Capitol Land Trust = ~350 acres conserved riparian
habitat
⢠Headwaters = working forestlands w/landmark Green
Diamond HCP signed in 2000
⢠Large functional wetlands
downstream of headwaters
⢠Meets WQS for temperature
in spawning reaches
⢠Last dam year = 2001!
August 13, 2004
9. Goldsborough Dam
⢠Dam constructed
1921
⢠14â high x 100â
wide
⢠By 1996 = 35â
high
⢠Provided H20 for
steam generation
⢠Partial fish
passage built in
1939
10. Dam Removal
⢠Damaged in 1996 flood
⢠Removed September 2001
⢠Restoration Goals
â Provide full fish passage
â Protect downstream property
â Compensate for upstream
aggradation/downstream
degradation
⢠Placed 36 concrete weirs over
1700â (because ACE project)
⢠Cost = $4.8M
⢠Environmental Benefits
â Opened > 25 miles of stream
â 2/3 of spawning now above
dam site
11.
12. The Bad!
⢠Shelton Harbor
â Always a
working harbor
â Incremental
habitat
improvements
possible
15. The Ugly!
⢠Winter Creek
â Why the loss
of flow?
â Hydrogeology
study coming
16. More Ugly!
⢠Downtown Shelton reach
â Migratory corridor -- Widespread panic
w/flooding history whenever a tree falls in
17. Environmental Outcomes
⢠By 2020, increase coho smolt production by
15%
⢠EDT prediction of potential = 34,000/year
⢠(By 2020, achieve approved status for
shellfish harvest
throughout
Oakland Bay)
18. Goldsborough Summary
Good Bad Ugly
Headwaters X Winter Creek
(lacks flow)
Wetlands X (address invasives)
Canyon X RR
(re-connect
floodplain)
City X
(constrained by flood
risk to city)
Harbor X
(re-establish estuary
functions in working
harbor)
19. Keys to Success
⢠Fast response of a relatively healthy system
⢠Systematic approach to biological recovery
⢠Tribal leadership important to motivate partners
⢠Large, diverse & eager
partnership
⢠Initial success brought
additional financial support
Photo by Joe Puhn