Cooperative Research Units
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Redwood Creek Life Cycle Monitoring DIDSON 2015-2017


July 2015 - March 2017


This project will use a DIDSON sonar imaging system to estimate the number of adult steelhead migrating into and out of Redwood Creek during the 2015/2016 spawning season, to provide status and trend information for this ESA-listed fish. A DIDSON has been deployed on Redwood Creek since 2009 to test its potential for monitoring escapement of adult salmon. Previous research has demonstrated that analysis of images captured by DIDSON can be used effectively to enumerate migrating salmonids over a wide range of conditions. When combined with existing smolt monitoring data, these data will alllow smolt to adult and adult to smolt survival to be estimated. The project will also describe migration timing of steelhead in Redwood Creek, and evaluate relationships with environmental conditions (streamflow, temperature, tides) using standard statistical techniques.


Current Staff

Federal Staff: 1

Masters Students: 10

Phd Students: 0

Post Docs: 0

University Staff: 1

5 Year Summary

Students graduated: 10

Scientific Publications: 4

Presentations: 23



  • Margaret WilzbachPrincipal Investigator

Funding Agencies

  • California Department of Fish & Wildlife


California Cooperative Fish and Wildlife Research Unit Cooperators

  1. California Department of Fish and Wildlife
  2. Humboldt State University
  3. U.S. Fish and Wildlife Service
  4. U.S. Geological Survey
  5. Wildlife Management Institute