All of Armstrong County is located within the Ohio River Watershed. This means that all of the streams in the county eventually flow into the Allegheny River and then into the Ohio River. The Ohio River Watershed can be divided into smaller sub-watersheds.
There are 6 major watersheds within Armstrong County that flow into the Allegheny.
Buffalo Creek Watershed
Cowanshannock Creek Watershed
Crooked Creek Watershed
Kiski - Cone Watershed
Mahoning Creek Watershed
Red Bank Creek watershed
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