Carr Run is a long 3rd order tributary to Cussewago Creek in Crawford County, Pennsylvania.
Carr Run rises about 1.5 miles east of Springboro, Pennsylvania, and then flows north then southeast to join Cussewago Creek about 1.5 miles west of Mosiertown, Pennsylvania.
Carr Run drains of area, receives about 45.6 in/year of precipitation, has a wetness index of 508.61, and is about 47% forested.