Monongahela River

Monongahela River
The Monongahela River in Pittsburgh with South Side Pittsburgh on the right and Uptown Pittsburgh on the left
Map of the Monongahela River basin with the Monongahela River highlighted
Location
Country	United States
State	Pennsylvania and West Virginia
Counties	Marion WV, Monongalia WV, Greene PA, Fayette PA, Washington PA, Westmoreland PA, Allegheny PA
Physical characteristics
Source	Tygart Valley River
• location	Pocahontas County, West Virginia
• coordinates	38°28′06″N 79°58′51″W / 38.46833°N 79.98083°W / 38.46833; -79.98083[1]
• elevation	4,540 ft (1,380 m)[2]
2nd source	West Fork River
• location	Upshur County, West Virginia
• coordinates	38°51′08″N 80°21′32″W / 38.85222°N 80.35889°W / 38.85222; -80.35889[3]
• elevation	1,309 ft (399 m)[4]
Source confluence
• location	Fairmont, West Virginia
• coordinates	39°27′53″N 80°09′10″W / 39.46472°N 80.15278°W / 39.46472; -80.15278[5]
• elevation	863 ft (263 m)[3]
Mouth	Ohio River
• location	Pittsburgh, Pennsylvania
• coordinates	40°26′30″N 80°00′58″W / 40.44167°N 80.01611°W / 40.44167; -80.01611[5]
• elevation	709 ft (216 m)[5]
Length	130 mi (210 km)[6]
Basin size	7,340 sq mi (19,000 km2)[7]
Discharge
• location	Braddock, PA[8]
• average	12,650 cu ft/s (358 m3/s)
• minimum	2,900 cu ft/s (82 m3/s)
• maximum	81,100 cu ft/s (2,300 m3/s)
Discharge
• location	Masontown, PA[9]
• average	8,433 cu ft/s (238.8 m3/s)
Basin features
Tributaries
• left	West Fork, Coal Run, Buffalo Creek, Hawkinberry Run, Paw Paw Creek, Pharoah Run, Parker Run, Indian Creek, Birchfield Run, Meadow Run, Broad Run, Dents Run, Scotts Run, Courtney Run, Robinson Run, Crooked Run, Dunkard Creek, Whiteley Creek, Little Whiteley Creek, Pegs Run, Muddy Creek, Noel Run, Pumpkin Run, Rush Run, Tenmile Creek, Fishpot Run, Barneys Run, Twomile Run, Lilly Run, Pike Run, Wood Run, Hooders Run, Maple Creek, Pigeon Creek, Dry Run, Mingo Creek, Huston Run, Lobbs Run, Peters Creek, Thompson Run, Homestead Run, West Run, Streets Run, Becks Run
• right	Tygart River, Prickett Creek, Little Creek, Whiteday Creek, Joes Run, Toms Run, Booths Run, Cobun Creek, Deckers Creek, West Run, Laurel Run, Camp Run, Cheat River, Georges Creek, Jacobs Creek, Cats Run, Browns Run, Middle Run, Antram Run, Wallace Run, Hereford Hollow, Bates Run, Meadow Run, Kelley Run, Rush Run, Dunlap Creek, Redstone Creek, Lamb Lick Run, Downers Run, Speers Run, Turkey Hollow, Beckers Run, Sunfish Run, Bunola Run, Kelly Run, Mill Run, Smiths Run, Fallen Timber Run, Wylie Run, Youghiogheny River, Crooked Run, Turtle Creek, Ninemile Run

The Monongahela River (/məˌnɒŋɡəˈhiːlə/ mə-NONG-gə-HEE-lə, /-ˈheɪ-/ -⁠HAY-),^[10] sometimes referred to locally as the Mon (/mɒn/), is a 130-mile-long (210 km)^[6] river on the Allegheny Plateau in north-central West Virginia and Southwestern Pennsylvania. The river flows from the confluence of its west and east forks in north-central West Virginia northeasterly into southwestern Pennsylvania, then northerly to Pittsburgh and its confluence with the Allegheny River to form the Ohio River. The river includes a series of locks and dams that makes it navigable.