Montana filed water rights lawsuit against Wyoming in Supreme Court

On February 1, 2007, the state of Montana filed a lawsuit against the state of Wyoming in the US Supreme Court, claiming that Wyoming had violated the Yellowstone River Compact, which allocates water rights between the two states and North Dakota. In the lawsuit, Montana alleged that Wyoming had taken more than its share of water through improved irrigation methods and water storage facilities. The Court, which has original jurisdiction over lawsuits "in which a state shall be a party" under Article III of the US Constitution, appointed a special master to conduct fact-finding in October 2008 and ruled in favor of Wyoming in May 2011.

Learn more about Montana, Wyoming and water rights from the JURIST news archive.


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