Townley Run is a 3.68 mi (5.92 km) long tributary to West Branch French Creek that is classed as a 1st order stream on the EPA waters geoviewer site.

[3] Townley Run rises in Greenfield Township of eastern Erie County, Pennsylvania and then flows southeast to meet West Branch French Creek southwest of Little Hope, Pennsylvania.

Townley Run drains 4.71 square miles (12.2 km2) of Erie Drift Plain (glacial geology).

The watershed receives an average of 47.0 in/year of precipitation and has a wetness index of 484.45.

[5] The watershed is about 53% forested.