Yakima, WA -

Federal regulators say a U.S.-Canada treaty that governs operations of the Columbia River in the Pacific Northwest should be renegotiated to make the system more flexible amid climate change and to aid endangered species that weren't considered when the treaty was created decades ago.

The draft document released to The Associated Press also says efforts to improve the ecosystem should not impair efforts to ensure long-enjoyed low power prices in the region.

The Bonneville Power Administration and the U.S. Army Corps of Engineers are working with other federal agencies, four Northwest states and more than a dozen tribes to recommend whether the 1964 treaty should be renegotiated. The treaty has no expiration date, but either country may cancel it or suggest changes beginning in 2024 with 10 years' notice.