The lingering water dispute between Texas and Oklahoma has taken on a new twist. At issue is an agreement between four states — Texas, Oklahoma, Arkansas and Louisiana — that divide up water from the Red River and its tributaries, and the amount of water to which each state is entitled. After five years of legal disputes between the Tarrant County Water District and the state of Oklahoma, the case has reached the federal level, and the U.S. Supreme Court has asked the solicitor general to weigh in on the case. Attorneys for both sides will consult with the solicitor general’s office before they issue an opinion for the justices. Once that opinion is on the books, the opposing sides will be able to file briefs with the high court, which may or may not hear the case.