Powdermill Run is a long 2nd order tributary to French Creek in Venango County, Pennsylvania, Crawford and Mercer Counties, Pennsylvania.
Course Powdermill Run rises on the Warden Run divide about 3 miles northwest of Hannasville, Pennsylvania in Venango County. Powdermill Run then flows southwest through Crawford County into Mercer County to meet French Creek at Carlton, Pennsylvania.
Watershed Powdermill Run drains of area, receives about 43.7 in/year of precipitation, has a topographic wetness index of 426.12, and has an average water temperature of 8.17 °C. The watershed is 39% forested.
See also List of rivers of Pennsylvania List of tributaries of the Allegheny River
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