Justice THOMAS delivered the opinion of the Court.
This case arises out of a dispute between Montana and Wyoming over the Yellowstone River Compact. Montana alleges that Wyoming has breached Article V(A) of the Compact by allowing its pre-1950 water appropriators to increase their net water consumption by improving the efficiency of their irrigation systems. The new systems, Montana alleges, employ sprinklers that reduce the amount of wastewater returned to the river...
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