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Redband Trout Status (DRAFT)

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Upper Columbia Geographic UnitKootenai-Pend Oreille-Spokane Geographic UnitMiddle Columbia Geographic UnitOregon Closed Basin Geographic UnitMiddle Snake Geographic UnitUpper Snake Geographic UnitLower Snake Geographic Unit
  • * The Oregon Closed Basin is not included in the Columbia River Basin watershed. This Closed Basin is included on the map because the northern-most part of the Closed basin includes the Malheur Lakes Management Unit which may be considered by some entities for off-site mitigation opportunities.

Redband trout are native to Columbia River subbasins located east of the Cascade Range and are considered the most widely distributed native salmonid in the Columbia River Basin. Anadromous and potamodromous life histories are exhibited by redband trout in the Columbia River Basin, with potamodromous populations being represented by resident and migratory (fluvial and adfluvial) life history forms.

Declines in historic distribution and abundance of redband trout have occurred throughout the Columbia River Basin due to habitat degradation/loss, fragmentation, and non-native species. Analyses indicate redband trout occupy less than 50% of the stream habitat in which they were historically found in the Columbia River Basin. Estimating basin-wide abundance is problematic, as pertinent data are not available for close to half of the streams occupied by redband trout in the Columbia River Basin. For locations that data were available, researchers categorized the densities of almost 50% of those populations as low.

Adapted from:
Muhlfeld, C.C., S.E. Albeke, S.L. Gunckel, B.J. Writer, B.B. Shepard, B.E. May. 2015. Status and Conservation of Interior Redband trout in the Western United States, North American Journal of Fisheries Management 35:1, 31-53.