Page:Mississippi v. Tennessee (2021).pdf/2

 558 U. S. 256, to disputes over interstate river basins, see Florida v. Georgia, 585 U. S. __, __, and in situations where the pumping of groundwater has affected the flow of interstate surface waters, see Nebraska v. Wyoming, 515 U. S. 1, 14. The Court has also applied the doctrine to anadromous fish that migrate between the Pacific Ocean and spawning grounds in the Columbia-Snake River system, “travel[ing] through several States during their lifetime.” ''Idaho ex rel. Evans v. Oregon'', 462 U. S. 1017, 1018–1019, 1024.

(b) The Court rejects Mississippi’s contention that it has a sovereign ownership right to all water beneath its surface that precludes application of equitable apportionment. The Court has “consistently denied” the proposition that a State may exercise exclusive ownership or control of interstate “waters flowing within her boundaries.” Hinderlider v. La Plata River & Cherry Creek Ditch Co., 304 U. S. 92, 102. Although the Court’s past equitable apportionment cases have generally concerned streams and rivers, no basis exists for a different result