The Timeline explores historical events regarding the development of the Allegheny Watershed and the development of our society in western Pennsylvania, southwest New York and northern West Virginia. The 120 events on the Timeline have been loosely clustered into five periods: Exploration, Exploitation, Industrialization, Legislation, and Conservation. Five pie charts show the diminution of the once primeval forest. Events within the Watershed appear on the bottom of the Timeline. National and international events on top put regional events within a larger context of time.

The Timeline scrolls horizontally from left to right. Click on highlighted imagery or text to learn more about events or to read excerpts from historic documents. Click on the title above to bring you back to the five timeline choices.