“Graffiti exists along nearly every inch of space that is reachable from the trail winding along the hillside of the lower Wissahickon Valley, providing only obvious visible distinction between the bridge today and its original appearance, while adding a splash of local color and urban grit to the tranquil setting.” —[Historic American Engineering Record, Henry Avenue Bridge / Wissahickon Memorial Bridge]
The Necessity for Ruins 
Kids these days….
That netting looks pretty inviting. Summer adventure #1.
The center portion of this bridge was built to accomodate a subway from Hunting park ave to roxborough.