On this week's edition of 99% Invisible:
The Alvord Lake Bridge is, quite literally, the bridge to the modern world. It is one the oldest reinforced concrete structures still standing. The twisted iron bars embedded in the bridge served as the model for the all the rebar containing structures that followed. It is the ancestor to an endless number of reinforced concrete buildings, bridges, tunnels, viaducts, and foundations.
Friday at 7:35am & 4:45pm and Saturday at 8:35am.