Douglas County Public Utility District Survival Verification Study

In 1998 the Douglas County PUD in Washington began a multi-year survival study to determine the survival rate of fish passing through their hydroelectric project (Wells Dam) on the Columbia River. Biomark performed the PIT-tagging, fish husbandry, fish release, data collection and reporting during the three year study. The results from the study exceeded the 93% juvenile project survival standards that were set.

In 2010 Douglas County conducted a study to confirm that survival through the Wells Project for yearling Chinook and steelhead remains equal to or above the 93% juvenile project survival standard. To achieve this goal, Douglas Co. PUD requested Biomark to provide services in five portions of the project.

  1. Biomark PIT tagged 82,000 fish necessary to conduct the SVS
  2. Biomark installed a PIT tag monitor at Rocky Reach Dam.
  3. Biomark provided one person to assist WDFW in post tagging/pre-release husbandry and tag management.
  4. Biomark managed the fish loading, release husbandry, and worked with a team to conduct the fish transportation and releases.
  5. Biomark followed up these services with a written report of fish tagging and releases that was available for appending to the final Douglas County PUD SVS report. DCPUD has not released the preliminary survival results, and is expected to publish the final report by the end of 2010.

Project Summary

Project Description:

Wells Dam fish passage survival verification


Wells Hatchery (WA)

# of Fish Tagged to date:



Chinook (Threatened)

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