Designed for Life: Bankfull spanning structures that don't fail or fragment
Stream crossings can too often be a place where humans and nature collide. Poorly designed or outdated crossings undermine the hydrology and ecological integrity of the rivers and stream systems they intersect leading to habitat fragmentation, adverse economic affects, and increased likelihood of crossing failure that threatens human health and safety. Using an ecological approach, we can design stream crossings that are smart, safe and stable for all life.
Stream simulation design provides a long-life structure while restoring stream continuity. These structures have a life-span 2x that of traditional hydraulic design and are less likely to catastrophically fail during a storm or flood event. By mimicking the adjacent natural channel, SSD reconnects habitats allowing for multi-species, aquatic organism passage at different life stages and flow conditions. Consequently, coldwater wildlife are stronger, more resilient, and better able to survive into the future.
- Buck Creek, Trout Unlimited, USFS, and NCWRC (pictured above)
- Cathy's Creek and Revels Prong, Pisgah Forest, USFS in Transylvania Co., NC
- BLM Oregon: Successful Culvert Replacement on Lees Creek inDouglas County video
- USFWS: Successful culvert replacement in Down East Maine (good video, explains perched culverts and ponding)
Not Just Speculation: Stream Sim is smart, safe, and saves money over time
- Vermont case study
- Video USFWS: Flooding in Vermont, Fish Passage Project Part 1
- Economics of Culvert Replacement Case Study from ME
Get the Facts:
- Mackay Box Culvert: Example of box culvert acting as fish barrier - young fish try to move up but the flow is too intense
- Webinar from USGS: Culvert life cycle and prioritizing culvert replacement for aquatic passage in the north pacific: look at data supporting culvert replacement for passage
How to build an AOP crossing
- For Farmers and Landowners: USDA Webinar on building Low Water Crossings for Livestock and Equipment
- This webinar 1) reviews the ecological and geomorphic effects of low-water crossings in stream environments 2) presents guidance for selecting structures that minimize disruption of channel processes and habitats 3) summarizes basic design parameters and requirements 4) presents selected examples that illustrate performance, problems and advantages of different types of low-water crossings.
- For Engineers: Softree Engineering: Culvert Replacement and Fish Passage Webinar
- This seminar demonstrates the use of the Terrain Module in RoadEng to create major culvert and fish passage sites.
Other Resources: Assessment
- USFWS Fish Passage Links and Resources
- How to prioritize fish passage problems using WA Dept of Fish and Wildlife's prioritization manual:
- The Fish Passage Barrier and Surface Water Diversion Screening Assessment and Prioritization Manual provides guidance on how to locate, assess, and prioritize fish passage problems (culverts, dams, and fishways) and surface water diversion screening problems. These science-based protocols are well accepted and provide a consistent approach to determine a fish passage barrier. We encourage all parties assessing culverts to use the WDFW fish passage and screening assessment protocols and to share their data for inclusion in the statewide database. Level A Culvert Barrier Analysis Training Video
- NC Wildlife Resource's Commission Websote Resourses for Stream and Wetland Restoration
Funding resources for culvert replacement:
- NCWRC lists some funding sources on this page.
- Please contact TU to add a funding resource.
More about TU's Southeast Conservation Project
- TU Blog – SE Conservation
- Trout Unlimited Southeast
- Follow @tusoutheast Instagram and Twitter
- Some Streamer Chick Episode
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