World's Largest Self-Anchored Suspension Bridge

(credit: Justin Sullivan/Getty Images)

Catwalks hang over a section of the newly constructed eastern span of the Bay Bridge during a media tour of the self-anchored suspension span tower on Aug. 29, 2011 in Oakland.

World's Largest Self-Anchored Suspension Bridge

(credit: Justin Sullivan/Getty Images)

A section of the newly constructed eastern span of the Bay Bridge is seen next to the existing bridge during a media tour of the self-anchored suspension span tower on Aug. 29, 2011 in Oakland.

World's Largest Self-Anchored Suspension Bridge

(credit: Justin Sullivan/Getty Images)

A worker stands on the bottom of a 1,060-foot catwalk that hangs over the newly constructed eastern span of the Bay Bridge during a media tour of the self-anchored suspension span tower on August 29, 2011 in Oakland.

World's Largest Self-Anchored Suspension Bridge

(credit: Justin Sullivan/Getty Images)

A section of the newly constructed eastern span of the Bay Bridge is seen during a media tour of the self-anchored suspension span tower on August 29, 2011 in Oakland.

World's Largest Self-Anchored Suspension Bridge

(credit: Justin Sullivan/Getty Images)

Members of the media take photos of the newly constructed eastern span of the Bay Bridge during a tour of the self-anchored suspension span tower on Aug. 29, 2011 in Oakland.

World's Largest Self-Anchored Suspension Bridge

(credit: Justin Sullivan/Getty Images)

A section of the newly constructed catwalks hang over the eastern span of the Bay Bridge next to the existing bridge during a media tour of the self-anchored suspension span tower on Aug. 29, 2011 in Oakland.

World's Largest Self-Anchored Suspension Bridge

(credit: Justin Sullivan/Getty Images)

A ship passes by the eastern span of the Bay Bridge during a media tour of the construction site of the new self-anchored suspension span tower on Aug. 29, 2011 in Oakland.

World's Largest Self-Anchored Suspension Bridge

(credit: Justin Sullivan/Getty Images)

Catwalks hang over a section of the newly constructed eastern span of the Bay Bridge during a media tour of the self-anchored suspension span tower on Aug. 29, 2011.

World's Largest Self-Anchored Suspension Bridge

(credit: Justin Sullivan/Getty Images)

Catwalks are seen hanging over the newly constructed eastern span of the Bay Bridge during a media tour of the self-anchored suspension span tower on August 29, 2011.

World's Largest Self-Anchored Suspension Bridge

(credit: Justin Sullivan/Getty Images)

Members of the media walk on the deck of the newly constructed eastern span of the Bay Bridge during a tour of the self-anchored suspension span tower on Aug. 29, 2011 in Oakland.

World's Largest Self-Anchored Suspension Bridge

(Credit: Justin Sullivan/Getty Images)

Catwalks hang over a section of the newly constructed eastern span of the Bay Bridge during a media tour of the self-anchored suspension span tower on Aug. 29.

World's Largest Self-Anchored Suspension Bridge

(credit: Justin Sullivan/Getty Images)

A reporter stands next to the self-anchored suspension span tower during a media tour of the newly constructed eastern span of the Bay Bridge on Aug. 29 in Oakland.