Stony Run is a tributary of Buffalo Creek in Union County, Pennsylvania, in the United States.

The stream is impacted by nutrient pollution, sediment, E. coli, and thermal radiation.

Here, it turns southeast for several tenths of a mile before receiving an unnamed tributary from the left.

[1] Stony Run joins Buffalo Creek 9.68 miles (15.58 km) upstream of its mouth.

[2] Stony Run is impacted by nutrient pollution, sediment, E. coli, and thermal radiation.

In 2000, row crops and streambank erosion contributed 46,974 and 33,173 pounds (21,307 and 15,047 kg) of sediment, respectively.

[5] A debris fan from the late Pleistocene occurs in the vicinity of Stony Run.

[3] The watershed of Stony Run makes up 1 percent of the Buffalo Creek drainage basin.

[3] Stony Run was entered into the Geographic Names Information System on August 2, 1979.

[4] The John Umstead tract, which was located along Stony Run, was surveyed by Thomas Sutherland on May 17, 1770.

[7] In a 2008 report, the watershed of Stony Run was ranked tenth amongst sub-watersheds in the Buffalo Creek drainage basin for restoration priority.

[3] There are 0.2 miles (0.32 km) of vegetated riparian buffers along streams in the watershed of Stony Run.