Dive summary:

• The design for a 1,750-foot cable-stayed bridge that will be built over the Willamette River in Oregon is so precise that each 16-foot, cast-in-place concrete segment comes with its own 500-plus-page manual.
• Profile grade tolerances are tight for Kiewit Infrastructure West Co., which holds the $119 million design-build contract for the mass-transit-only span that is sup[posed to open in 2015 between Portland and Milwaukie, carrying a light-rail line.
• The bridge will have 3.5 miles of cable stays, with each end of a stay attaching to a bridge segment after passing over a tower, and construction will require temporary stays between each permanent one.

From the article:

"Combining traveler deflections, cable-stay influences and inherent variability in concrete stiffness will be a real test for our designer and erection teams to meet these tolerances." ...