Because they are two different rivers!
The Monongahala River (i'm not quite sure i spelled that right), and the Allegheny River
No. Sharks are primarily saltwater fish. While one shark did swim a distance up the Hudson river, the Allegheny River is too far from the ocean. In order to get there a shark would have to swim up half the Mississippi River and the entire length of the Ohio River.
Allegheny River (from the North East) and the Monongahela River (from the South East) meet to form the Ohio River.
The three rivers that run through Pittsburgh, PA are:Allegheny RiverOhio RiverMonongahela RiverThe Allegheny River and the Monongahela River meet at Pittsburgh to form the Ohio River.
The Allegheny, The Monongahela and the Ohio.
The Allegheny River and the Monongahela River
The Allegheny River and the Monongahela River
The Allegheny River and the Monongahela River
Tne Allegheny and Monongahela flow together and form the begining of the Ohio.
A used Condom Floating down the Allegheny River in Pittsburgh
Pittsburgh
Pittsburgh