| Welch Run | |
| Name Other: | Tributary to Buffalo Creek |
| Map Size: | 300 |
| Pushpin Map: | USA Pennsylvania#USA |
| Pushpin Map Size: | 300 |
| Pushpin Map Caption: | Location of Welch Run mouth |
| Pushpin Map Alt: | Map of Welch Run mouth location |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Pennsylvania |
| Subdivision Type3: | County |
| Subdivision Name3: | Washington |
| Length: | 1.75miles[1] |
| Discharge1 Location: | Buffalo Creek |
| Discharge1 Avg: | 1.1cuft/s at mouth with Buffalo Creek[2] |
| Source1: | Sugarcamp Run divide |
| Source1 Location: | pond about 1.5 miles northeast of Dunsfort, Pennsylvania |
| Source1 Coordinates: | 40.2111°N -80.4833°W[3] |
| Source1 Elevation: | 1120feet[4] |
| Mouth: | Buffalo Creek |
| Mouth Location: | Dunsfort, Pennsylvania |
| Mouth Coordinates: | 40.1886°N -80.5036°W |
| Mouth Elevation: | 837feet[5] |
| Progression: | Buffalo Creek → Ohio River → Mississippi River → Gulf of Mexico |
| River System: | Ohio River |
| Tributaries Left: | unnamed tributaries |
| Tributaries Right: | unnamed tributaries |
| Bridges: | PA 331 |
Welch Run is a 1.75miles long 1st order tributary to Buffalo Creek in Washington County, Pennsylvania.
Welch Run rises in a pond about 1.5 miles northeast of Dunsfort, Pennsylvania, in Washington County and then flows southwest to join Buffalo Creek at Dunsfort.[5]
Welch Run drains of area, receives about 40.1 in/year of precipitation, has a wetness index of 288.69, and is about 88% forested.[2]