Cooperative Research Units
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FS: Cutthroat Population Conditions within the Logan Watershed


July 2012 - June 2017


Most subspecies of cutthroat trout Oncorhynchus clarkii are imperiled or extinct due to the

combined effects of habitat degradation and interactions with exotic species. To quantify abundance and vital

rates and evaluate trends, we selected a large population of Bonneville cutthroat trout O. clarkii utah from the

Logan River of northern Utah, a river characterized by high-quality and connected habitat. Over a 15-year

period, we have been continuing a comprehensive population assessment, including depletion-based abundance

estimates and a mark–recapture study (2,000 tagged fish) of site fidelity, growth, and survival. Our results provide important

conservation and recovery benchmarks for identifying rangewide limiting factors of cutthroat trout.


Current Staff

Federal Staff: 95

Masters Students: 239

Phd Students: 143

Post Docs: 53

University Staff: 239

5 Year Summary

Students graduated: 701

Scientific Publications: 1949

Presentations: 4261



Funding Agencies

  • USDA Forest Service


Cooperative Research Units Program Headquarters Cooperators

  1. U.S. Geological Survey