| Powdermill Run | |
| Name Other: | Tributary to White Oak Run |
| Map Size: | 300 |
| Pushpin Map: | Pennsylvania#USA |
| Pushpin Map Size: | 300 |
| Pushpin Map Caption: | Location of Powdermill Run mouth |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Pennsylvania |
| Subdivision Type3: | County |
| Subdivision Name3: | Westmoreland |
| Length: | 4.36miles[1] |
| Discharge1 Location: | White Oak Run |
| Discharge1 Avg: | 10.2cuft/s at mouth with White Oak Run[2] |
| Source1: | Linn Run/Clear Run divide |
| Source1 Location: | about 1 mile west of Bald Knob[3] |
| Source1 Coordinates: | 40.1181°N -79.2253°W[4] |
| Source1 Elevation: | 2370feet |
| Mouth: | White Oak Run |
| Mouth Location: | about 0.25 miles southwest of Weaver Mill, Pennsylvania |
| Mouth Coordinates: | 40.1725°N -79.2689°W |
| Mouth Elevation: | 1332feet |
| Progression: | northwest |
| River System: | Loyalhanna Creek |
| Tributaries Left: | unnamed tributaries |
| Tributaries Right: | unnamed tributaries |
Powdermill Run is a 4.36miles long 2nd order tributary to White Oak Run in Westmoreland County, Pennsylvania. This stream passes through the Powdermill Nature Preserve of the Carnegie Museum.
According to the Geographic Names Information System, it has also been known historically as:[4]
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.[3]
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.[2] The watershed is 99% forested.[2]