What does lifting, moving and welding 50-foot sections of
102-inch (8 ½ foot) steel pipe look and sound like? Check out the sights and sounds of pipeline
installation at the Irvington Portal:
A total 18,660 feet of welded steel pipe will be installed
in the new tunnel. The pipes are the final
liner of the New Irvington Tunnel, through which the pristine drinking water
from Hetch Hetchy Reservoir will flow to the San Francisco Bay Area.