Monongahela River Watershed
The Monongahela is formed by the confluence of the West Fork River and the Tygart Valley River at Fairmont, West Virginia. The river is navigable its entire length with a series of locks and dams that maintain a minimum depth of 9 feet (2.7 m) to accommodate coal-laden barges. In Pennsylvania, the Monongahela is met by two major tributaries: the Cheat River, which joins at Point Marion, and the Youghiogheny River, which joins at McKeesport.

Some of the featured rivers and streams of the Monongahela Watershed are:
- Monongahela River
- North Fork of the Blackwater River
- Tygart River (Guage and Belington)
- Middle Fork River
- Buckhannon River
- Tygart River at Arden (Phillipi)
- West Fork River
- Cheat 5 Forks and Canyon River
- Big Sandy Creek
- Deckers Creek