Watershed Atlas


Watershed Atlas

The Allegheny and Monongahela River Watersheds cover 19,154 square miles of the greater Western Pennsylvania region. Residents and visitors of Pennsylvania, New York, West Virginia and Maryland are touched by the depths and richness of the Watershed.

Two thousand years ago, tribes of the Six Nations lived and hunted here. Today, more than two million people live, work and play along the same streams and rivers. Although the people and circumstances continue to change, our connection to the water remains.

We invite you to explore the Watershed Atlas of the Monongahela and Allegheny Rivers. Enjoy our heritage, discover the beauty of our land, and feel the strength of the Watersheds. Learn how glaciers and water shaped our landscape. Discovery historic events that shape communities, and the recreational opportunities available today.  See how natural systems cycle water, and learn how we treat the water here affects life downstream.  

The Watershed Atlas is a project of the Pennsylvania Environmental Council and is hosted by RiverQuest.  Click the logo below to go to WatershedAtlas.org.