The low bid for the State Route 520 bridge project was $160 million under the projected budget, according to the Washington State Department of Transportation.

Kiewit-General-Manson’s bid of $586.5 million for building the new, six-lane floating bridge, was well under the high end estimate of $750 million listed in proposals.

Construction is expected to start in 2012, with the new bridge open to traffic in December 2014.

The design includes a six-lane floating bridge with wider, safer shoulders, transit/HOV lane in each direction, as well as a bicycle bad pedestrian path.

The plan also calls to build an easy approach which connections to the six-lane Eastside high way currently under construction and to build new maintenance facilities and a dock on the east shore of Lake Washington.

The team with the low bid is the same company which build the Tacoma Narrows Bridge and the SR 104 Hood Canal Bridge.