Oregon is resuming its yearslong legal battle against the federal government over dwindling fish populations in the Columbia River following the Trump administration’s withdrawal from a historic agreement that sought to restore their runs.

The state on Thursday filed requests asking a judge to reopen earlier litigation and to allow motions for an injunction to block the withdrawal.

Oregon, Washington, the four Lower Columbia Treaty tribes and conservation groups worked out the Resilient Columbia Basin Agreement, signed in 2023. It put an end to decades of lawsuits over salmon runs and pledged to honor tribal treaty obligations and help tribal clean energy development.

Within months after the agreement, the federal government acknowledged for the first time the devastation that federal

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