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John Day Mitigation

To develop and implement a mitigation program for losses due to the construction of John Day and The Dalles dams.

John Day Dam

John Day Dam

Project Goal

To develop and implement a mitigation program for losses due to the construction of John Day and The Dalles dams.

Impacts

An increase in fall chinook returns through implementation of mitigation for losses due to the construction of John Day and The Dalles dams.

Background

Fall chinook contribute heavily to ocean and in-river fisheries. The construction of John Day and The Dalles dams destroyed fall chinook spawning grounds in the mainstem of the Columbia River. Estimated losses range from 30,000 to 60,000 spawners. Congress authorized the Corps to mitigate for the losses caused by the dam construction. While the Corps did fund some mitigation for John Day, the loss was never fully mitigated. The project has $4M in capital construction to assist in implementing mitigation.

Project Tasks

  1. Verify appropriate mitigation levels by reviewing historical documents.
  2. Work with tribal staff to identify opportunities for implementing mitigation projects.
  3. Construction of new and/or modification of existing facilities to implement mitigation goal.
  4. Track basin-wide hatchery production programs and hatchery policies.

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