On Tuesday, the U.S. Supreme Court heard arguments in Tarrant v. Herrmann, an Oklahoma-Texas water fight with national implications.
The justices grappled with the 30-year-old Red River Compact, and whether a region of Texas can reach across state lines to access water in southeastern Oklahoma.
The two states have different interpretations of some language in the agreement. The compact gives Oklahoma and Texas “equal rights” to some of the water in southeastern Oklahoma. But “equal rights” means different things to each state.