The Bay Bridge connecting San Francisco and Oakland may not be as iconic as the Golden Gate but it's a vital traffic artery nonetheless. So how do you reconstruct the span without delaying its 280,000 daily commuters? Very carefully.

This is a shot from the top of the new single tower—525 feet tall, the largest of its kind. Now that the Cable Saddle is in place, workers have begun stringing the mile-long suspension cable that will support and stabilize the deck. The $6.3 billion project is scheduled for completion in 2013. [Popular Science]