Downstream Missouri River states have worried for decades about receiving an insufficient flow of water from upstream dams. Now they’re worried their share of water could be further diminished by potential pipelines for dry Western states. The concern is the basis of a dispute about the U.S. House version of the federal Water Resources Development Act. A provision in the bill would require approval from all governors in Missouri River states to study or construct a project that moves water from the river or its tributaries to a non-Missouri River state. … The governors of Montana, North Dakota and South Dakota — where the Missouri River flows through a series of dams and reservoirs — recently joined with governors in the Missouri River Basin states of Colorado and Wyoming on a letter opposing the House provision. Also signing the letter was the governor of Utah. … Utah relies on the Colorado River for some of its water, and the state’s Great Salt Lake Commission has mentioned the Missouri River as a potential source of imported water for the vanishing Great Salt Lake.