| Welty Run | |
| Name Other: | Tributary to Sewickley Creek |
| Map Size: | 300 |
| Pushpin Map: | USA Pennsylvania#USA |
| Pushpin Map Size: | 300 |
| Pushpin Map Caption: | Location of Welty Run mouth |
| Pushpin Map Alt: | Map of Welty Run mouth location |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Pennsylvania |
| Subdivision Type3: | County |
| Subdivision Name3: | Westmoreland |
| Length: | 6.59miles[1] |
| Discharge1 Location: | Sewickley Creek |
| Discharge1 Avg: | 20.12cuft/s at mouth with Sewickley Creek[2] |
| Source1: | Fourmile Run divide |
| Source1 Location: | about 3 miles southeast of Weltytown, Pennsylvania[3] |
| Source1 Coordinates: | 40.1875°N -79.4017°W[4] |
| Source1 Elevation: | 2015feet |
| Mouth: | Sewickley Creek |
| Mouth Location: | Norvelt, Pennsylvania[5] |
| Mouth Coordinates: | 40.2125°N -79.4931°W |
| Mouth Elevation: | 975feet |
| Progression: | Sewickley Creek → Youghiogheny River → Monongahela River → Ohio River → Mississippi River → Gulf of Mexico |
| River System: | Monongahela River |
| Tributaries Left: | unnamed tributaries |
| Tributaries Right: | unnamed tributaries |
| Waterbodies: | Mammoth Lake |
| Bridges: | Shady Lane, Ankney Hill Road, PA 982, Welty Road, County Park Road, Klaka Road, County Road, Holly Place, Mt. Pleasant Road |
Welty Run is a 6.59miles long 3rd order tributary to Sewickley Creek in Westmoreland County, Pennsylvania. This is the only stream of this name in the United States.[4]
According to the Geographic Names Information System, it has also been known historically as:[4]
Welty Run rises about 3 miles southeast of Weltytown, Pennsylvania,[3] and then flows west to join Sewickley Creek at Norvelt, Pennsylvania.[5]
Welty Run drains of area, receives about 44.4 in/year of precipitation, has a wetness index of 393.98, and is about 52% forested.[2]