Montana Trout Unlimited v. Montana Department of Natural Resources

A proposed copper mine located near tributaries of the highly protected Smith River in central Montana set off a series of lawsuits over the use of water in the state. After a number of administrative hearings and subsequent trials, the only substantial question left was the status of “mine dewatering.” The Montana Supreme Court decided whether 1,500,000 gallons of water removed annually from the inner workings of a mine should require a water use permit as a beneficial use or if it exists outside of the regulatory jurisdiction of the Montana Department of Natural Resources under the Montana Water Use Act.