Monongahela River

Also known as Mon River

river in Pennsylvania and West Virginia, United States

Key facts

Country: United States
State: Pennsylvania and West Virginia
Counties: Marion WV , Monongalia WV , Greene PA , Fayette PA , Washington PA , Westmoreland PA , Allegheny PA
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
Elevation: 4,540 ft (1,380 m)
2nd source: West Fork River
Mouth: Ohio River
Length: 130 mi (210 km)
Basin size: 7,340 mi (19,000 km )
Average: 12,650 cu ft/s (358 m /s)

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Article

The Monongahela River (/məˌnɒŋɡəˈhiːlə/ mə-NONG-gə-HEE-lə, /-ˈheɪ-/ -⁠HAY-), sometimes referred to locally as the Mon (/mɒn/), is a 130-mile-long (210 km) 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.

Etymology