Arroyo Seco River Concrete Grade Control Fish Passage Alternative Design Project - Clark Colony Water Company Diversion Structure

Salmonid Restoration Planning and Assessments

Restoration Planning And Coordination
Project ID1578344376205
Recovery DomainsS. California - S. Central CA Coast
Start Date06/01/2020
End Date11/01/2022
Last Edited04/13/2022
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This project will conduct and alternatives analysis and 100 percent design package for modification of a concrete sill spanning the entire width of the Arroyo Seco River to improve fish passage for the federally threatened South Central Coast steelhead trout. Because the sill is integrated into a diversion canal, the project will also identify the preferred alternative for compliant fish screens and fish by-pass flows. The final product will be 100% designs of the preferred alternative which modifies the existing concrete grade control sill and the associated pre-1914 diversion structure and fish screen.

Project Benefit    

The project will provide for unimpeded fish passage for all life history stages of the threatened native steelhead population while providing the landowners (Clark Colony Water Company) with continued use (diversion) of water consistent with their Pre-1914 rights.


Metric Completed Originally

Funding Details

In-Kind Other$31,978
Report Total:$302,609

Project Map



  • Worksite Identifier: 1578344376403
  • Start Date:
  • End Date:
Area Description
Clark Colony Water Company Diversion Structure

Location Information

  • Basin: Central California Coastal
  • Subbasin:
  • Watershed:
  • Subwatershed:
  • State: California
  • Recovery Domain: S. California - S. Central CA Coast
  • Latitude: 36.28576
  • Longitude: -121.3142


    No ESU data was found for this worksite.




  • B.0 Salmonid Restoration Planning and AssessmentsY (Y/N)
    •      . . B.0.a Planning And Assessment Funding .00
    •      . . B.0.b.1 Area Encompassed
    •      . . B.0.b.2 Stream Miles Affected
    •      . . B.1 Restoration Planning And CoordinationY (Y/N)
      •      . . . . B.1.a Planning and Coordination funding
      •      . . . . B.1.b.11 Engineering/design work for restoration projectsY (Y/N)
        •      . . . . . . B.1.b.11.a
          Name of plan implemented
        •      . . . . . . B.1.b.11.b
          Description and scope of the plan implemented