Water providers in California's Central Valley are asking a federal judge to stop releases of extra water intended to help salmon in the Klamath Basin survive the drought.

The petition was filed late Monday in U.S. District Court in Fresno, California, by Westlands Water District and the San Luis & Delta-Mendota Water Authority, which supply farmers.

At issue is water held in a reservoir on the Trinity River. The U.S. Bureau of Reclamation started increasing flows into the Trinity River on Saturday to prevent the spread of disease and get adult salmon in the lower Klamath River to start moving upstream.

The Bureau did not reduce the amount of water going to irrigators, but if the drought continues, there will be less water in the reservoir next year.