Monongahela

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Related to Monongehela: Monongahela River

Monongahela

(mənŏn'gəhē`lə, –hā`lə), river, 128 mi (206 km) long, formed at Fairmont, N W.Va., by the junction of the West Fork and Tygart rivers. It flows north, through a valley marked by a decline in heavy industry and coal mining, into SW Pennsylvania, where it joins the AlleghenyAllegheny
, river, 325 mi (523 km) long, rising in N central Pa., and flowing NW into N.Y., then SW through Pa. to the Monongahela, with which it forms the Ohio River at Pittsburgh; drains 11,580 sq mi (29,992 sq km).
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 to form the OhioOhio,
river, 981 mi (1,579 km) long, formed by the confluence of the Allegheny and Monongahela rivers in SW Pa., at Pittsburgh; it flows northwest, then generally southwest to enter the Mississippi River at Cairo, Ill.
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 River at Pittsburgh. The canalized river is navigable for most of its length. Iron, steel, and coal are the chief products moved on the river. The Monongahela was the first river in the United States to be improved for navigation.

Monongahela

a river in the northeastern US, flowing generally north to the Allegheny River at Pittsburgh, Pennsylvania, forming the Ohio River. Length: 206 km (128 miles)