Reason Run Tributary to Youghiogheny River
Location of Reason Run mouth Show map of Pennsylvania Reason Run (the United States) Show map of the United States
Location
Country	United States
State	Pennsylvania Maryland
County	Fayette (PA) Garrett (MD)
Physical characteristics
Source	Buffalo Run divide
• location	about 1 mile northeast of Asher Glade, Maryland[2]
• coordinates	39°42′37″N 079°25′38″W / 39.71028°N 79.42722°W / 39.71028; -79.42722[1]
• elevation	1,820 ft (550 m)[2]
Mouth	Youghiogheny River in Youghiogheny River Lake
• location	about 1.5 miles southwest of Somerfield, Pennsylvania[3]
• coordinates	39°43′41″N 079°24′29″W / 39.72806°N 79.40806°W / 39.72806; -79.40806[1]
• elevation	1,439 ft (439 m)[3]
Length	2.19 mi (3.52 km)[4]
Basin size	1.43 square miles (3.7 km2)[5]
Discharge
• location	Youghiogheny River in Youghiogheny River Lake
• average	2.79 cu ft/s (0.079 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	unnamed tributaries
• right	unnamed tributaries
Bridges	Guard Road

Reason Run is a 2.19 mi (3.52 km) long 1st order tributary to the Youghiogheny River in Fayette County, Pennsylvania.

Reason Run rises about 1 mile northeast of Asher Glade, Maryland in Garrett County,^[2] and then flows north-northeasterly into Fayette County, Pennsylvania to join the Youghiogheny River in Youghiogheny River Lake about 1.5 miles southwest of Somerfield.^[3]

Reason Run drains 1.43 square miles (3.7 km²) of area, receives about 46.7 in/year of precipitation, has a wetness index of 330.63, and is about 75% forested.^[5]

• List of rivers of Maryland
• List of rivers of Pennsylvania