Santa Cruz, CA
831.421.9291
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  Portland, OR
503.227.5979
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Eureka Canyon Bridge Replacement and Fish Passage Improvements @ Koinonia Conference Center

IMG 2531webClient: Resource Conservation District of Santa Cruz County

Waterways contracted with the Santa Cruz County Resource Conservation District (SCRCD) and the State Coastal Conservancy to provide design services for the improvement of fish passage at a stream crossing along Shingle Mill Gulch. The project site had a 6-foot diameter corrugated metal pipe culvert which provided conveyance beneath a private driveway servicing the Koinonia Conference grounds. Hydraulic analyses of the culvert determined that it was undersized for design flood flows and presented a fish passage impediment to migrating salmonids.

The proposed project replaced the existing culvert with a full span bridge and channel restoration features to improve fish passage, habitat value, and flood conveyance. The bridge alignment was located approximately 85 feet downstream of the existing crossing. This alignment was selected to allow continuous access to the campground during construction and to provide an acceptable turning radius for buses entering from and leaving to travel south on Eureka Canyon Road.

Site improvements included:

 

  • Construction of a roughened channel and a large wood structure
  • Installation of bank protection
  • Construction of bridge, abutments, and retaining walls
  • Relocation of a portion of the private driveway
  • Installation of erosion control and native revegetation