Gillespie Run is a 4.11 mi (6.61 km) long 3rd order tributary to the Youghiogheny River in Allegheny County, Pennsylvania.

Gillespie Run Tributary to Youghiogheny River
Location of Gillespie Run mouth Show map of Pennsylvania Gillespie Run (Youghiogheny River tributary) (the United States) Show map of the United States
Location
Country	United States
State	Pennsylvania
County	Allegheny
Physical characteristics
Source	Beckets Run divide
• location	about 2 miles west-southwest of Mustard, Pennsylvania[1]
• coordinates	40°13′28″N 079°51′34″W[2]
• elevation	1,115 ft (340 m)[1]
Mouth	Youghiogheny River
• location	Sutersville, Pennsylvania[3]
• coordinates	40°14′31″N 079°48′13″W[2]
• elevation	738 ft (225 m)[3]
Length	4.11 mi (6.61 km)[4]
Basin size	8.32 square miles (21.5 km2)[5]
Discharge
• location	Youghiogheny River
• average	8.25 cu ft/s (0.234 m3/s) at mouth with Youghiogheny River[5]
Basin features
Progression	Youghiogheny River → Monongahela River → Ohio River → Mississippi River → Gulf of Mexico
River system	Monongahela River
Tributaries
• left	Douglass Run
• right	unnamed tributaries
Bridges	Pond Lane, Guffey Road, PA 51, Scenery Drive, Pineview Drive (x4), Berdar Drive, Douglass Run Road (x2)

Course

Gillespie Run rises about 2 miles west-southwest of Mustard, Pennsylvania,[1] and then flows northeasterly to join the Youghiogheny River across from Sutersville.[3]

Watershed

Gillespie Run drains 8.32 square miles (21.5 km²) of area, receives about 39.5 in/year of precipitation, has a wetness index of 318.16, and is about 62% forested.[5]

References

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