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Arnault Branch is a stream in Washington County, Missouri. It is a tributary of Mineral Fork.
Arnault Branch derives its name from Philippe Francois Renault, an early businessperson in the local lead-mining industry. A variant name is "Arnault Creek".
Coordinates: 38°1′54.7″N 90°48′35.1″W / 38.031861°N 90.809750°W / 38.031861; -90.809750
