The fourth segment of the self-anchored suspension tower was added to the San Francisco-Oakland Bay Bridge on Monday.

Click on the photo to the right to see a slideshow of the tower addition.

Crews lifted the newest section onto the bridge in an around-the-clock operation, according to the Toll Bridge Program Oversight Committee.

The segment boosts the tower up to 480 feet, leaving the structure just 45 feet under its final 525-foot height, the committee said.

For more information about the self-anchored suspension tower, please visit www.baybridgeinfo.org/projects/sas-tower.