Powdermill Run is a long 2nd order tributary to White Oak Run in Westmoreland County, Pennsylvania. This stream passes through Powdermill Nature Reserve, the field station of the Carnegie Museum of Natural History.
Variant names According to the Geographic Names Information System, it has also been known historically as: Powder Mill Creek Powder Mill Run Powdermill Creek Tributary No.1 to White Oak Run
Course Powdermill Run rises on the Linn Run/Clear Run divide about 1 mile west of Bald Knob in Westmoreland County. Powdermill Run then flows northwest to meet White Oak Run about 0.25 miles southwest of Weaver Mill, Pennsylvania.
Watershed Powdermill Run drains of area, receives about 52.1 in/year of precipitation, has a topographic wetness index of 359.94, and has an average water temperature of 8.58 °C. The watershed is 99% forested.
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