Welty Run is a 6.59 mi (10.61 km) long 3rd order tributary to Sewickley Creek in Westmoreland County, Pennsylvania.

[1] According to the Geographic Names Information System, it has also been known historically as:[1] Welty Run rises about 3 miles southeast of Weltytown, Pennsylvania,[2] and then flows west to join Sewickley Creek at Norvelt, Pennsylvania.

[3] Welty Run drains 12.66 square miles (32.8 km2) of area, receives about 44.4 in/year of precipitation, has a wetness index of 393.98, and is about 52% forested.

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