stillaguamish big trees project...title: stillaguamish big trees project author: rodney pond and...
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Stillaguamish Big Trees Project
Rodney Pond & Scott Moore
Snohomish County Surface Water Management
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Project Specifics
Two Ecology funded Centennial Clean Water grants targeted at reducing in-stream
temperatures for Chinook salmon through riparian restoration
South Fork 2007 - $443,000
27 acres/4.6 river-miles
204 trees/acre
North Fork 2008 - $436,250
32 acres/5.2 river-miles
175 trees/acre
Minimum average 50 foot buffer width
Grant period four years
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Why Reforestation?
In-stream temperatures regularly exceed WA state
WQ standard for core salmonid habitat during the
summer
Lack of mature trees providing near stream shade - 32%
forested, only 12% conifer
Natural regeneration hindered by land use and invasive
species
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Date 25-Jun 2-Jul 9-Jul 16-Jul 23-Jul 30-Jul 6-Aug 13-Aug 20-Aug 27-Aug 3-Sep 10-Sep 17-Sep 24-Sep 1-Oct
DM
ax F
low
(FT
3/S
)
Ru
nn
ing
7D
AD
Max
H2O
& A
DM
ax T
emp
(°C
)
SF Stillaguamish Running 7DADMax H2O & ADMax Air Temp (°C) & DMax Flow (FT3/S)
SF Stilly Cascade Park SF Stilly River Meadows Park SF Stilly Avg Max Daily Air Temp SF Stillaguamish Flow
2009
WA WQS summer salmonid habitat 16° max
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Big Trees Approach
Focus on establishing native conifers for long term ecosystem function
and stability
Use larger stock size for faster establishment and greater
survivorship
Raise stock in-house to ensure quality and availability
Aggressively control invasives
Under-plant deciduous floodplain
forests to manage succession
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Knotweed Infestations
Almost all SBTP sites have some knotweed presence
Major infestations predominantly on the NF Stilly in floodplain forest understories, on
banks and levees and in unmaintained fields
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Trafton Trailhead County Park AKA Cloverdale
Trafton River Ranch (private)
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New bank March 2012
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Planting
Planting Site conditions species selection &
Stock size
Shade, topography, soils, existing plant community, previous invasives, control
effectiveness
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Maintenance Challenges
Knotweed recurrence adaptive control Active erosion set backs
Sediment deposition species selection High flows staking
Browsing caging/chemical deterrents