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The Dalles Subpopulation Status and 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.

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The Dalles Reservoir subpopulation, which had been increasing since 1988, experienced a significant decline in abundance and density from 2008 to 2011. In 2011, the abundance and density of white sturgeon (>24 inches) were estimated at 101,006 and 9.1 white sturgeon/acre, respectively. From 2008 to 2011, the white sturgeon (> 24 inches) abundance estimate decreased by 32,254. This population decline resulted in a density of 9.1 white sturgeon/acre in 2011.

Monitoring results indicate that survival of juvenile white sturgeon through their first year of life (i.e., recruitment) occurs approximately 90% of the time, and is highly variable.1 Recruitment index values in 2011 were significantly higher than the five-year range and were the highest recorded for The Dalles Reservoir since 1999.

In 2011, managers estimated that 2,730 white sturgeon in The Dalles Reservoir were of a harvestable size (i.e., 43-54 inches). During 2012, the combined annual catch estimate for The Dalles Reservoir commercial and recreational fisheries was 1,274, which was significantly greater than the 10-year average of 565 fish.


* Monitoring did not occur during years for which data do not exist.


* Monitoring did not occur during years for which data do not exist.


* Index value 0 = No recruitment during that year
* For a description of the methods used to estimate the index value that is associated with the number of fish that survive during their first year , please visit Monitoring Method website.

Hatchery Releases

No releases


See other data snapshots that help us gauge the abundance of fish and wildlife:

Subpopulations for Lower Mid-Columbia Management Unit

Other Management Units - Subpopulations