Nebraska Sues Colorado in Supreme Court Over South Platte River Water Rights
A legal battle is brewing between Nebraska and Colorado as Nebraska filed a lawsuit with the U.S. Supreme Court yesterday, October 15, 2025, alleging Colorado is not adequately sharing water from the South Platte River, a critical resource for both states.
The lawsuit centers around the 1923 South Platte River Compact, which guarantees Nebraska a share of the river’s water during irrigation season. Nebraska argues Colorado’s increasing water diversions, particularly for growing cities and agricultural needs, threaten its water supply. The dispute has been simmering for years, exacerbated by prolonged drought conditions across the western U.S., which are projected to worsen with climate change. Nebraska Governor Jim Pillen stated at a news conference, “We’re going to fight like heck … and we’re going to do it in the United States Supreme Court.”
Colorado Attorney General Phil Weiser responded, asserting the state will defend its water rights. “We cannot be afraid to litigate or fight for our rights in Colorado,” Weiser said during a recent community meeting. A key point of contention is Nebraska’s renewed interest in a canal project—originally conceived as part of the compact—that would divert water from Colorado. Nebraska is even considering using eminent domain to acquire land in Colorado for the canal, a move that has sparked opposition from Colorado landowners and farmers. Understanding interstate water compacts is crucial for comprehending this dispute; more information can be found at the Bureau of Reclamation’s water law page.
Colorado filed a response brief today, claiming the case is not yet appropriate for Supreme Court review. The Court has not yet indicated whether it will hear the case. Officials from both states have indicated a preference for negotiation, but the path forward remains uncertain as water scarcity continues to strain relations in the region. The outcome of this case could set a precedent for resolving similar water disputes in other western states, as detailed in research on the Colorado Sun.
