kelley creek confluence restoration monitoring · kelley creek confluence restoration intro to...
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Kelley Creek Confluence Restoration MonitoringSean Bistoff, City of Portland Environmental Services (BES)Jennifer Antak, City of Portland BESHolly Walla, PE, City of Portland BESJanet Corsale, PE, Inter-Fluve, Inc.
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Presentation Outline1. Kelley Creek Confluence project description2. Pre-construction monitoring: Survey of old
Kelley Creek channel3. Implementation monitoring4. Ongoing Monitoring Program:
Hydraulic performanceHabitat: Low flow; high flowFish presenceVegetation Establishment
5. Summary of data and project performance
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Kelley Creek
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Project GoalsProvide fish and wildlife habitatReduce downstream floodingImprove Water Quality
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Kelley Creek Confluence Restoration Intro to project site
• Restoration project was completed in 2004
• Ongoing monitoring program began in winter 2004
• Monitoring program is first of it’s kind for the City of Portland
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Pre-Construction Reference Survey of Old Channel
Modified Oregon Department of Fish and Wildlife habitat survey methods
Pre-construction survey data is the reference for the ongoing monitoring program
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Implementation MonitoringInspection
Substrate did not conform to specs. Wood anchoring problemsThese potential problems are now monitored regularly
As-built profile survey matched plans
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Hydraulic Performance Monitoring• Photo documentation during low and
high flow• Low-flow channel and floodplain
inspection• Longitudinal and cross sectional
channel surveys• Pebble counts at riffles
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Hydraulic Monitoring Photo points
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Hydraulic Monitoring Flood Events
20042005 2006
• Design Discharge (9 month)
2007
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Hydraulic Performance Channel Stability
• Channel can migrate:+/- 6 inches vertically+/- 4 feet laterally
• Headcutting at grade control riffles not acceptable
• Avulsion not acceptable
Design Criteria for the channel
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Hydraulic Monitoring Pebble Counts
• Riffle substrate gradation
• Mean pebble size varying, but within acceptable range
Riffle 1 Cumulative Particle Size Distribution
-10.010.030.050.070.090.0
110.0
1 10 100 1000Millimeters
Perc
ent F
iner
Tha
n
2005 2006 2007
Riffle 4 Cumulative Partical Size Distribution
-50.0
0.0
50.0
100.0
150.0
1 10 100 1000
Millimeters
Perc
ent F
iner
Th
an
2005 2006 2007
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Aquatic Habitat Monitoring
Does created habitat persist?Does created habitat conform to design criteria?
Pre-Construction reference surveyModified Oregon Dept Fish & Wildlife methods
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Aquatic Habitat - summer rearing
• Total habitat area
286 m2, pre-design
400 m2, design criteria
570 m2 in 2007
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Aquatic Habitat - summer rearing - pools
design criteria
pre-project 2007
Pool area (% wetted area) > 40% 59%* 34%
Residual pool depth, m > 0.5 0.13 0.45
Large wood, #/100 m > 20 0 51
* not persistent
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Cold Water Rearing
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Aquatic Habitat - summer rearing - riffles
designcriteria
pre- project 2007
gravel-cobble substrate >90% 71% 98%
% fines (< 2 mm) < 10% 13% 1.6%
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Spawning Riffles
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Aquatic Habitat - summer rearing
• 1.00, all design criteria met• 0.30, pre-project (2004)• 0.94, 2007
Weighted average of score
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Aquatic Habitat – Winter High Flow Refuge• Dammed and backwater pools desirable• Visual estimate of total area with depth
>.15m, velocity < .15 m/s• No high flow refuge was present pre-
project
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Species Composition Total from all Fish
Surveys
Sculpin
Redside Shiner
SpeckledDace
Lamprey
Large Scale Sucker
Crayfish
Longnose Dace
Pumpkinseed
Cutthrout Trout
Rainbow/Steelhead Trout
Mosquito Fish
Cutbow
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Vegetation MonitoringPlant establishment during growing seasonInvasive weed coveragePlant density and mortality rate per speciesEffectiveness of mowing, mulching and spraying treatmentsFunction of irrigation system
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Vegetation Monitoring Results2,041 Woody Species Plants per acre• Overall 26% mortality rate
Red alder highest rate at 68% Overall 67% recruitment rate
Red alder highest rate at 237%- seeds establish better in compacted mineral soil than plants
• Willow and dogwood survival rate is higher than other restoration sites due to temporary irrigation
Willow mortality rate 10%, Dogwood 0.0%
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Monitoring Results Vegetation• Seed germination poor in some places due to
clay soils• In one highly compacted area - site has been
seeded 3 times• Floodplain sediment deposits are helping
vegetation establishment • Native fowl manna grass present - highly
desirable for waterfowl• Exotic ground cover 12%
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2004
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2007
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May 2002
May 2002
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May 2005
May 2005
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May 2006
May 2006
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April 2007
April 2007
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Overall Monitoring Results• Modest adjustments in planform as expected• Small changes in grain size distribution • Project maintains a high amount of available
fish habitat, good pool complexity and fair summer pool depths
• Pool area and depth is likely better than data suggests
• High percentage of native fish, some salmonids• Some bullfrogs are present• High vegetation survival and recruitment rate• Sediment deposits on the floodplain• Low invasive weed introduction• It’s a learning process
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Kelley Creek Confluence Restoration MonitoringTHANKS!Oregon Watershed Enhancement Board