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- Allegheny River. The Allegheny River is a 325-mile-long headwater stream of the Ohio River that runs from its headwaters just below the middle of Pennsylvania’s northern border, northwesterly into New York, then in a zigzag southwesterly across the border and through Western Pennsylvania to join the Monongahela River at the Forks of the Ohio at Point State Park in Downtown Pittsburgh, Pennsylvania.
- Monongahela River. The Monongahela River, sometimes referred to locally as the Mon, is a 130-mile-long river on the Allegheny Plateau in north-central West Virginia and Southwestern Pennsylvania.
- Schuylkill River. The Schuylkill River is a river running northwest to southeast in eastern Pennsylvania, flowing for 135 miles from Pottsville to Philadelphia, where it joins the Delaware River as one of its largest tributaries.
- Clarion River. The Clarion River, a tributary of the Allegheny River, is approximately 110 mi long and flows through narrow serpentine valleys and hardwood forests in west central Pennsylvania.
The Allegheny River ( / ˌælɪˈɡeɪni / AL-ig-AY-nee) is a 325-mile-long (523 km) headwater stream of the Ohio River that is located in western Pennsylvania and New York in the United States.
- 11,580 sq mi (30,000 km²)
- United States
- 325 mi (523 km)
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What is the third longest river in Pennsylvania?
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The distance between its northern and southern boundaries is 158 miles. It is America's 33rd largest state. The landforms of Pennsylvania had their origin about 500 million years ago, when a vast interior sea, up to several hundred miles wide, occupied the area from New England to Alabama. For about 250 million years, the rivers originating ...
- Mt. Davis3,213 ft.
- 1,100 ft.
- Delaware RiverSea level
The Monongahela is formed by the confluence of the West Fork River and its "east fork"—the Tygart Valley River —at Fairmont in north central West Virginia. From there it flows northeasterly to cross the Pennsylvania border just west of north Cheat Lake on its Cheat River tributary.
- 130 mi (210 km)
- Tygart Valley River
Feb 13, 2023 · The Pennsylvania Water Atlas is an excellent tool for educators and decision-makers. It was first released in 2009 as a printed atlas. In 2022, it was updated and re-released as a digital StoryMap. The new version s shares data on PA's statewide water use from 2008 to 2020. The 2009 Printed Water Atlas.
Mar 3, 2022 · USGS national programs in the Susquehanna River Basin in Pennsylvania have included the National Water Quality Program and Chesapeake Bay Activities . In Pennsylvania, the USGS's water-resources roots date back to the late 1800's, with the initiation of streamflow gaging on the Susquehanna and Delaware Rivers and assessments of groundwater ...
Mar 22, 2023 · In the United States, few rivers have shaped the country's history as the Allegheny River, the third longest river in Pennsylvania. This 321 miles long river is one of the country's national wild and scenic rivers, flowing through Pennsylvania and New York .
