Secretary of Interior Sally Jewell wants to blow up four hydroelectric dams along the Klamath River to restore rivers to their natural state.

Federal and state officials with the utility company PacifiCorp all signed an agreement to blow up the dams, claiming that doing so will “restore natural river flow.” Under the terms of the agreement, the four dams must be removed by 2020. Environmentalists describe the proposal as the “most significant dam removal and restoration project ever undertaken.”

Federal authorities claim that the dams must be destroyed to “advance the recovery of its fisheries, uphold trust responsibilities to the tribes, and sustain the region’s farming and ranching economy.”

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