| Furnace Run | |
| Name Other: | Tributary to Youghiogheny River |
| Map Size: | 300 |
| Pushpin Map: | USA Pennsylvania#USA |
| Pushpin Map Size: | 300 |
| Pushpin Map Caption: | Location of Furnace Run mouth |
| Pushpin Map Alt: | Map of Furnace Run mouth location |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Pennsylvania |
| Subdivision Type3: | County |
| Subdivision Name3: | Fayette |
| Length: | 2.7miles[1] |
| Discharge1 Location: | Youghiogheny River |
| Discharge1 Avg: | 4.78cuft/s at mouth with Youghiogheny River[2] |
| Source1: | Allen Run divide |
| Source1 Location: | Buena Vista, Pennsylvania[3] |
| Source1 Coordinates: | 40.0211°N -79.7083°W[4] |
| Source1 Elevation: | 1290feet |
| Mouth: | Youghiogheny River |
| Mouth Location: | about 1 mile west of Dawson, Pennsylvania[5] |
| Mouth Coordinates: | 40.0569°N -79.6911°W |
| Mouth Elevation: | 839feet |
| Progression: | Youghiogheny River → Monongahela River → Ohio River → Mississippi River → Gulf of Mexico |
| River System: | Monongahela River |
| Tributaries Left: | unnamed tributaries |
| Tributaries Right: | unnamed tributaries |
| Bridges: | Goth Road, PA 201, Virgin Run Road, Hawk Road (x3) |
Furnace Run is a 2.7miles long 2nd order tributary to the Youghiogheny River in Fayette County, Pennsylvania.
Furance Run rises in Buena Vista, Pennsylvania,[3] and then flows northeast to join the Youghiogheny River about 1 mile west of Dawson.[5]
Furnace Run drains of area, receives about 43.0 in/year of precipitation, has a wetness index of 348.92, and is about 67% forested.[2]
Furnace Run is the location of Furnace Run Confluence BDA, which contains a scour area and a mature riverine forest as well as a rare plant species.[6]