Braddock Run is a long 2nd order tributary to Big Sandy Creek in Fayette County, Pennsylvania.
Braddock Run rises about 0.25 miles east of Chalk Hill, Pennsylvania, and then flows southwest to join Big Sandy Creek about 2 miles south of Chalk Hill.
Braddock Run drains of area, receives about 52.4 in/year of precipitation, has a wetness index of 345.34, and is about 72% forested.