The biggest dam removal project in American history is back on track, following an agreement last week to move ahead with demolition of four dams on the Klamath River in southern Oregon and Northern California. “This dam removal is more than just a concrete project coming down. Though two Klamath dams they rely on for irrigation are not slated for removal, they worry that any dam removal sets a precedent that could affect their livelihood. If the Klamath River project goes forward it will be the largest by far. For Chook-Chook Hillman, a Karuk tribal member fighting for dam removal, the question goes beyond science.