The Youghiogheny River, or the Yough for short, is a 134-mile-long (216 km) tributary of the Monongahela River in West Virginia, Maryland, and Pennsylvania. It drains an area on the west side of the Allegheny Mountains northward into Pennsylvania, providing a small watershed in extreme western Maryland into the tributaries of the Mississippi River. Youghiogheny is a Lenape word meaning "a stream flowing in a contrary direction".
Ohiopyle Falls on the Youghiogheny in Ohiopyle State Park in Pennsylvania
Youghiogheny Lake and Dam on the Youghiogheny River near Confluence, Pennsylvania
The Lower Yough: One of the most actively run sections of whitewater east of the Mississippi River
Youghiogheny River at West Newton, Pennsylvania
The Monongahela River, sometimes referred to locally as the Mon, 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.
The Monongahela River in Pittsburgh with South Side Pittsburgh on the right and Uptown Pittsburgh on the left
The South Tenth Street Bridge over the Monongahela River in Pittsburgh in 2005
The Monongahela River in Fairmont, West Virginia, in 2006
Opekiska Lock and Dam on the Monongahela River near Fairmont, West Virginia, at river mile 115 (185 km)