Culley Run begins in a valley in Benton Township between Steinbuck Road and Cully Run Road.
It flows southeast for several hundred feet, alongside Cully Run Road.
It then turns east for a short distance and then turns south, still following the road.
After a few tenths of a mile, the stream crosses Pennsylvania Route 254 and turns east-southeast for several tenths of a mile, flowing alongside Pennsylvania Route 254.
After several tenths of a mile, it crosses Pennsylvania Route 254 again.
Several hundred feet further downstream, it reaches its confluence with Fishing Creek, not far from the community of Maple Grove.

Culley Run joins Fishing Creek 21.16 miles (34.05 km) upstream of its mouth.
Culley Run begins in a valley in Benton Township between Steinbuck Road and Cully Run Road. It flows southeast for several hundred feet, alongside Cully Run Road. It then turns east for a short distance and then turns south, still following the road. After a few tenths of a mile, the stream crosses Pennsylvania Route 254 and turns east-southeast for several tenths of a mile, flowing alongside Pennsylvania Route 254. After several tenths of a mile, it crosses Pennsylvania Route 254 again. Several hundred feet further downstream, it reaches its confluence with Fishing Creek, not far from the community of Maple Grove.
Culley Run joins Fishing Creek 21.16 miles (34.05 km) upstream of its mouth.
Culley Run