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Bull Trout Trends and Abundance*

(DRAFT)

Columbia Headwaters Recovery Unit

Upper Clark Fork River Recovery SubunitLower Clark Fork River Recovery SubunitFlathead River Recovery SubunitPriest River Recovery Subunit Abundance: 20,650 - 140,900
Trend: Stable

Historic and current activities have led to conditions that are limiting the abundance and productivity of bull trout in the Columbia River Headwaters Recovery Unit. Activities such as construction of impassable dams/culverts/diversions, land-use management, road construction/maintenance, and past fisheries management actions have affected the quality and quantity of riparian habitat and aquatic conditions.

Throughout the recovery unit, dams/culverts/diversions prevent bull trout passage, fragment habitat and populations, and degrade water quality and quantity.

Historic and present land-use practices (i.e., forestry, grazing, agriculture, and mining) have degraded riparian and aquatic resources. Habitat degradation (riparian and in-stream) and impaired water quality/quantity are limiting bull trout abundance and productivity in all Columbia River Headwaters Recovery Unit core areas.

Construction and maintenance of road networks for forestry activities and general transportation have degraded habitat and water quality/quantity. Examples of some impacts associated with the transportation networks in the Columbia River Headwaters Recovery Unit include increased sediment loading, altered runoff patterns, restriction of normal stream channel movements and bank stabilization, and migration barriers.

Effects from past fishery management practices continue to limit bull trout abundance and productivity. Brook trout present an on-going threat to bull trout through hybridization and possible competition for resources, as well as potential predation.

*The abundance and trend estimates represents summations of the information provided in the USFWS 5-Year Review. For a comprehensive review of the estimated abundance and trends, please refer to U.S. Fish and Wildlife Service. 2008. Bull Trout (Salvelinus confluentus) 5-Year Review: Summary and Evaluation. U.S. Fish and Wildlife Service. Portland, OR. 55 pp.

For a comprehensive review of the limiting factors affecting bull trout in this recovery unit, please refer to:
http://www.fws.gov/pacific/bulltrout/RP/Chapter_3%20Clark%20Fork.pdf
http://www.fws.gov/pacific/bulltrout/RP/Chapter_4%20Kootenai.pdf
http://www.fws.gov/pacific/bulltrout/RP/Chapter_15%20Coeur%20d%20Alene.pdf

Adapted from:

U.S. Fish and Wildlife Service. 2002. Chapter 3, Clark Fork River Recovery Unit, Montana, Idaho, and Washington. 285 p. U.S. Fish and Wildlife Service. Bull Trout (Salvelinus confluentus) Draft Recovery Plan. Portland, OR.

U.S. Fish and Wildlife Service. 2002. Chapter 4, Kootenai River Recovery Unit, Oregon. 89 p. In: U.S. Fish and Wildlife Service. Bull Trout (Salvelinus confluentus) Draft Recovery Plan. Portland, OR.

U.S. Fish and Wildlife Service. 2002. Chapter 15, Coeur d’Alene Lake Basin Recovery Unit, Oregon. 92 p. In: U.S. Fish and Wildlife Service. Bull Trout (Salvelinus confluentus) Draft Recovery Plan. Portland, OR.

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