Brush Run is a 8.64 mi (13.90 km) long 1st order tributary to Buffalo Creek in Washington County, Pennsylvania.

Brush Run rises about 3 miles east of Buffalo, Pennsylvania, in Washington County and then flows west-southwest to join Buffalo Creek at Acheson.

[3] Brush Run drains 24.81 square miles (64.3 km2) of area, receives about 39.9 in/year of precipitation, has a wetness index of 323.39, and is about 40% forested.

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