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Pacific Lamprey Passage Design

To restore Pacific lamprey to historical usual and accustomed places in the Columbia Basin by increasing survival and protecting and enhancing freshwater habitat.

Bonneville Dam lamprey bypass system

The Bonneville Dam lamprey bypass system

Project Goal

To restore Pacific lamprey to historical usual and accustomed places in the Columbia Basin by increasing survival and protecting and enhancing freshwater habitat.

Impacts

Increase lamprey populations upstream of Bonneville Dam by increasing passage survival and identifying freshwater habitat needs.

Background

Lamprey is an important tribal cultural food source. Lamprey abundance declined dramatically over the last twenty-five years. Lamprey are no longer observed in tributaries where they once were numerous. Loss of lamprey in tributary systems reflects a decline in ecosystem health and function. The tribes developed a restoration plan in response to the dramatic decline. Passage mortality is one of the major factors for decline. Habitat protection and enhancement is important because freshwater residence can last up to four years.

Features of the Bonneville Dam lamprey bypass system

Features of the Bonneville Dam lamprey bypass system

Project Tasks

  1. Identify structural elements to improve juvenile survival at mainstem dams.
  2. Identify structural elements to improve adult survival at mainstem dams.
  3. Improve understanding of basic lamprey biology through on the ground projects such as radio telemetry to track adult migration and genetic analysis to determine population structure.
  4. Monitor and evaluate lamprey population status and trends.
  5. Collaborate with tribal staff to explore opportunities for supplementation to expand spawning range into extirpated areas.
  6. Establish and coordinate public education and other outreach programs.

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