Black Ash Creek begins in a valley near Booth Road in Ross Township.

A few tenths of a mile further downstream, it flows out of its valley and then reaches its confluence with Rogers Creek.

[2] The surficial geology near the mouth of Black Ash Creek mainly consists of alluvium, which contains stratified gravel, sand, and silt, along with some boulders.

[7] Black Ash Creek was entered into the Geographic Names Information System on August 2, 1979.

[4] This name appears on county highway maps published by the Pennsylvania Department of Transportation.