Sporhase v. Nebraska ex rel. Douglas, 458 U.S. 941 (1982), was a case in which the United States Supreme Court decided that a Nebraska statute forbidding commercial exportation of water from Nebraska was unconstitutional in that it violated the dormant commerce clause.
The boundary between the states of Nebraska and Colorado passed through a farm owned by Sporhase. He drilled a well in Nebraska and used the water to irrigate his land on both sides of the boundary. Under the 11th Amendment, he could not sue the state of Nebraska in a federal district court; consequently his suit had to proceed in the state courts in Nebraska until he petitioned the United States Supreme Court to review it.