A river rising in north-central
Pennsylvania and flowing approximately 523 km (325 mi) northwest into
New York then weaving its way southwest into Pennsylvania again, where it joins the
Monongahela River at
Pittsburgh to form the
Ohio River at
The Point.
As the river meets its final destination in Pittsburgh, it is somewhat interesting to note that part of the Pittsburgh Regatta takes place on the Allegheny. Steel mills, coal transportation, and other Industrial Age industry relied on the river for rapid transportation of materials. The river is still used today for the same purposes, although to a much lesser extent.
Also, the Allegheny River is somewhat cleaner than the Mon.