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 Poorly designed or outdated crossings undermine the hydrology and ecological integrity of the rivers and stream systems they intersect leading to habitat fragmentation, adverse economic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.


Successful projects

Not Just Speculation: Stream Sim is smart, safe, and saves money over time

Get the Facts:

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.
  • FishXing
    FishXing software assists engineers, hydrologists and fish biologists design and evaluate culverts for fish passage. FishXing software is compatible with Win95/98/2000 or NT.

    The most recent update is FishXing 2.0 which, among other features, allows users to compare multiple culverts designs within a single project, calculate hydraulic conditions within circular, box, pipe-arch, open-bottom arch, and embedded culverts, and produce tables and graphs summarizing the water velocities, water depths, outlet conditions. The output also lists the limiting fish passage conditions for each culvert design.
    Click for more information

Other Resources: Assessment

Funding resources for culvert replacement:

More about TU's Southeast Conservation Project

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