It flows southeast for several tenths of a mile, reaching the base of the mountain and entering a valley.

Here, it turns east for a few miles, entering Buffalo Township and receiving two unnamed tributaries from the left.

The stream eventually turns south-southeast for more than a mile before reaching its confluence with Spruce Run.

[6] A wagonmaker and farmer named Phillip Stahl settled at the mouth of the stream near Mazeppa in 1793, having moved from Bucks County.

[7] A steel girder and floorbeam system bridge carrying T-389 was built over Black Run 0.8 miles (1.3 km) north of Mazeppa in 1936 and was repaired in 2003.

A concrete tee beam bridge carrying State Route 1002 was built over the stream in 1948.