It is approximately 1.3 miles (2.1 km) long and flows through Davidson Township, Sullivan County, Pennsylvania.

[1] The surficial geology in the vicinity of Bearwallow Run mostly consists of bedrock containing sandstone and shale, especially on the valley slopes and plateaus.

[4] The surficial geology in the upper reaches of the stream is much the same, with Boulder Colluvium on the valley floors and bedrock elsewhere.

[3] There were plans to make the area in the vicinity of Bearwallow Run part of Pennsylvania State Game Lands Number 13 as early as 1930.

[8] The entire length of the stream is considered by the Pennsylvania Fish and Boat Commission to be Class B Wild Trout Waters.