The US Supreme Court currently has 4 interstate water disputes before it — John Fleck

From Circle of Blue:

Interstate Water Lawsuit

A special master ruled largely in favor of Wyoming in a legal dispute with Montana over water from the Tongue River. Montana claimed that Wyoming diverted more water from the river than it was entitled to.

Appointed by the U.S. Supreme Court to hear the evidence, Barton Thompson, a Stanford law professor, determined that in two of the nine years in question, Wyoming exceeded its water rights. The amounts at stake are miniscule: 1,464 acre-feet in 2004 and 62 acre-feet in 2006 — less water than a large farm would use in a year.

The case began in 2007 when Montana sued Wyoming over water use in two tributaries of the Yellowstone River. Oral arguments before the court, which is not required to follow the special master’s recommendations, could occur in 2015…

U.S. Supreme Court

In addition to Montana v. Wyoming, three other disputes between states over shared rivers are moving through the nation’s highest court. The justices have appointed special masters to hear arguments and offer legal guidance in two cases: Florida against Georgia, and Texas versus New Mexico. A third case, between Kansas and Nebraska, was argued before the court last October. A ruling will likely come in 2015.

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