Ecological Considerations for Road Design at River and Stream Crossings

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Presenter: Scott Jackson
Length: 3 Parts, 44 min 5 s

View: Part 1 | Part 2 | Part 3

       Topics:

       Part 1

• Linear Stream Systems
• Dams
• Sub-standard Culverts
• List of Culvert Problems
• Started with Salmon
• Matrix of Species Involved
• Ecological Processes
• Food Chain Support
• Interdependencies
• Predator-Prey Dynamics
• Flooding
• Loss of Stream Continuity
• Importance of Movement

       Part 2

• Movement of Materials
• Large Pools Important to Organisms
• Debris Deflectors
• Data From Modelling Project
• Impacts of River and Stream Crossings
• Reduced Habitats to Vital Habitats
• Access to Vital Habitats
• Main Stream
• Move up to Spawn in Smaller Streams
• And then Head Back Down
• Blocked Access from Road
• Reduce the Carrying Capacity
• Can No Longer Access Smaller Areas
• Population Fragmentation and Isolation
• Population Viabilty
• Population Fragmentation Scenario
• Suitable Habitat
• Barriers in Habitat
• Habitat Above and Below Dams
• Fragment to 5 Habitats
• Smaller Habitats Disappear
• Processes that Maintain Regional Populations
• Access to Vital Habitats Again
• Smaller Streams
• Movements Back and Forth
• Source Synch Dynamics
• Fragmentation
• Recolonizing Areas Vacant Due to Extinctions
• Introduction of Barriers
• Loss of Habitat
• Blocked Access

       Part 3

• Salamander Families
• Turtles
• Crayfish
• Small Streams
• Importance of Small Streams
• Partially Aquatic Species
• Expanded Bridges
• Chicopee Watershed Example
• 279 Dams Located In Watershed
• Roads and Railroads
• Stream Crossings
• Potential Stream Barriers
• Back to the Impacted Species
• Quote from Also Leopold- 1953

These presentations were produced by Michael J. Furniss and Jeff Guntle, of the US Forest Service, PNW and PSW Research Stations.
US Forest Service, Pacific Northwest Research Station, Pacific Southwest Research Station, Stream Systems Technology Center