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Transboundary Upper Columbia Management Unit Trends

Information and data adapted from Parker, B., T, Rien, B. James, R. Beamesderfer. 2013. Review Draft Columbia Basin White Sturgeon Planning Framework. Portland, Or.

Click on subpopulation to view status and trends.    To view all subpopulations in the basin click here
Transboundary Upper Columbia Management Unit Lake Roosevelt subpopulation
The Transboundary Upper Columbia White Sturgeon Management Unit consists of two subpopulations, one that ranges from the international border upriver to Keenleyside Dam and another between the international border and Lake Roosevelt. Data suggest that the two subpopulations are likely localized and may not frequently interact.

White sturgeon population estimates for this reach are significantly less than the endangered status criteria identified by the World Conservation Union and the Committee on the Status of Endangered Wildlife in Canada. In this reach of the Columbia River, the adult white sturgeon populations are characterized as ageing and decreasing. Results from monitoring studies suggest juvenile white sturgeon are unable to survive beyond their first 12 months in this area of the Columbia River Basin. Subsequently, white sturgeon managers and researchers have indicated that the population will decline by 75% within the next 20 years. Limiting factors for white sturgeon in the Transboundary Upper Columbia Management Unit include: flow regulation, water quality (temperature and contaminants), reduced nutrient levels, habitat (diversity, quality, and quantity), and increased predation due to changes in fish species composition (i.e., introduction of non-native species and the elimination of anadromous fish).

To protect the existing population, current regulations prohibit angling for white sturgeon in the Transboundary Upper Columbia Management Unit.