bpa proposal 31019 fish passage assessment & prioritization program washington county land use...
TRANSCRIPT
BPA Proposal 31019
Fish Passage Assessment & Prioritization Program
Washington County Land Use & Transportation
Greg Miller, P.E., Operations Manager
Principal Investigator:Janet Oatney
Scope of the Problem
ODF&W evaluated 69 of approximately 3000 existing culverts
Typical Washington Co. Culverts
Consistent Limiting Factors
• Watershed
• Subbasin
• Province
• Basin
Relationship to Hydro System
•24 Dams in the Willamette Subbasin
•4,751,308 yds2
spawning habitat lost
5th Field Approach - Highest Priority First
• Evaluate each barrier in relationship to obtaining access to core areas of productive habitat
USFS “Measurements of Surrogates Indicative of Hydraulic Conditions”
Integration of Existing DataCritical Component Concept
• Stream slope
• Culvert slope
• Bankfull width & velocity
• Jump
• Flow & water depth
• Culvert size & condition
• Habitat quality
Prioritization Methodology
Barrier Analysis
Corridor Analysis
Transportation Factors
Effects Summary
• Share information
• Biggest bang for our
environmental buck
• Improve habitat
• Useable for private property
information
If We Do Nothing
• Projects selected based on transportation system needs
• Greatly reduced gain in accessible habitat
Questions?