Cooperative Research Units
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Lower Redwood Creek Juvenile Salmonid Abundance Project

Trap in lower Redwood Creek


June 2009 - March 2014


Redwood Creek is one of the major rivers in Humboldt County, California and supports salmon and steelhead trout that are federally listed as threatened under the Endangered Speicies Act. Redwood Creek is currently listed as sediment and temperature impaired, and various restoration efforts (and plans) in the basin have occurred, or on-going. Prior to this study there was little to no information on the population size of anadromous salmonids (adults or juveniles) utilizing the majority of the Redwood Creek basin. For the past five years we have successfully determined smolt population estimates for listed salmonid species migrating to the ocean from the majority of the Redwood Creek watershed; the production that we are missing (Prairie Creek watershed) is monitored by Humboldt State University. This study is a cooperative effort with California Department of Fish and Game (CDFG), Redwood National Park (RNP), the landowner where the trap is located, and trapping efforts in the upper basin (Redwood Creek Landowners Association, CDFG, and Fisheries Restoration Grant Program). RNP assists this study via estuary sampling. This study was designed to be long term, and collects data that can be used to assess watershed conditions and restoration activities.

Research Products and Activities

Technical Publications

  • Sparkman, M.D. 2011. Lower Redwood Creek Juvenile salmonid (smolt) abundance project 2004-2010 SeasonsAbstract |
  • Sparkman, M.D. 2012. Lower Redwood Creek Juvenile salmonid (smolt) abundance project 2004 - 2011 seasons.Abstract |

Current Staff

Federal Staff: 95

Masters Students: 240

Phd Students: 143

Post Docs: 52

University Staff: 245

5 Year Summary

Students graduated: 702

Scientific Publications: 1948

Presentations: 4253



  • Walter DuffyPrincipal Investigator
  • Jasper AmirStaff
  • Nicholas CampiseStudent
  • Bret DiehlStaff
  • Rebecca DutraStaff
  • Charles FlowerStaff
  • Matthew BryantStaff
  • Melissa GordonStaff
  • Thomas HermanStaff
  • Scott LordStaff
  • Roderick ParkStaff
  • Matthew SettelmayerStaff
  • Nicholas Van VleetStaff
  • Dominic VitaliStaff
  • Michael SparkmanNon-PI Collaborator
  • Todd NewhouseStaff

Funding Agencies

  • California Department of Fish and Game


Cooperative Research Units Program Headquarters Cooperators

  1. U.S. Geological Survey