Mackey Run is a 5.97 mi (9.61 km) long 3rd order tributary to Muddy Creek in Crawford County, Pennsylvania.

Mackey Run rises about 3 miles east of Woodcock, Pennsylvania, and then flows east-northeast to join Muddy Creek about 0.5 miles south of Eaton Corners.

[3] Mackey Run drains 13.07 square miles (33.9 km2) of area, receives about 45.0 in/year of precipitation, has a wetness index of 457.36, and is about 69% forested.

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