États-Unis >
Pennsylvania >
Allegheny County >
Pittsburgh
Showing the new and old grades from the hump removal project. The building on the left is the Allegheny County Courthouse and Jail. The "hump" cut took place in the downtown area known as Grant's Hill. The project began with planning in 1909 and ended with the final cut in 1913. It changed the gradient of Grant Street, Diamond Street, and Oliver, Fifth, Sixth, Webster and Wylie Avenues. February 24th, 1913.