Nevada sued the Trump administration on Monday, along with the Colorado River Commission of Nevada and the Southern Nevada Water Authority, in the first legal challenge to the federal government’s 10-year plan for managing the drought-stricken Colorado River. The plan, finalized by the Department of the Interior on Friday, calls for a 21% reduction in water supplied to California, Nevada and Arizona for two years beginning in 2027; the cuts could nearly double after 2028. Nevada says the framework unfairly burdens the three lower basin states while imposing no mandatory reductions on Colorado, Utah, New Mexico and Wyoming. The state argues the plan could threaten southern Nevada’s health and safety, environment and economy, where about two-thirds of Nevada’s residents live and much of its economy is concentrated. Filed in federal court in Las Vegas, the lawsuit names the Department of the Interior, Interior Secretary Doug Burgum, the U.S. Bureau of Reclamation and its commissioner, Aubrey Bettencourt. Nevada alleges violations of administrative and environmental law and the Law of the River, including failures to consider reasonable alternatives, assess foreseeable economic effects, respond fully to public comments and analyze mitigation measures. The dispute follows more than three years of unsuccessful negotiations among the seven states that share the river; the existing management plan expires this year. The Colorado River supplies water to one in 10 Americans and generates power for 6 million people.