Nebraska is suing Colorado over the amount of water it draws from the South Platte River, the latest in a long history of water rights disputes between the states that have been left increasingly dry by climate change.

Nebraska officials on Wednesday announced a lawsuit against Colorado, alleging the Centennial State is allowing “unlawful water diversions” from a transboundary resource. Nebraska Gov. Jim Pillen (R) and state Attorney General Mike Hilgers (R) accused Colorado of threatening Nebraska’s water supply along the South Platte River in multiple ways.

The Perkins County Canal Project has generated tension between the states since 2022. Attorney General Phil Weiser threatened legal action over Nebraska’s use of eminent domain