Colorado River Water Conservation District v. United States

The McCarran Amendment, 66 Stat. 560, 43 U. S. C. § 666, provides that “consent is hereby given to join the United States as a defendant in any suit (1) for the adjudication of rights to the use of water of a river system or other source, or (2) for the administration of such *803rights, where it appears that the United States is the owner of or is in the process of acquiring water rights by appropriation under State law, by purchase, by exchange, or otherwise, and the United States is a necessary party to such suit.” The questions presented by this case concern the effect of the McCarran…