PORTLAND, Ore. (AP) — Conservationists and the state of Oregon have asked a federal court to approve changes to dam operations on the lower Snake and Columbia Rivers to help restore salmon populations, the latest move in recently revived litigation over federally operated dams’ impacts on the fish.

Key requests, among others, include lowering reservoir water levels, which can help fish travel through them faster, and increasing spill, which can help juvenile fish pass over dams instead of through turbines.

The requests covering eight dams were part of a motion for a preliminary injunction filed Tuesday in U.S. District Court by plaintiffs including environmental groups such as the National Wildlife Federation. Defendants include federal agencies such as the National Marine Fisheries Se

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