Explosives drop century old Pittsburgh bridge.
A misty white blanket of fog surrounded the Masontown Bridge Saturday morning.
Crews waited patiently, making last-minute adjustments before it was safe enough for the first big blast.
And Route 21 was closed to traffic as workers prepared to demolish the 87-year-old bridge.
Then, 200 pounds of explosives sliced through tons of nearly century old steel. It happened only 10 feet away from the brand new bridge right next to it.
