BROOMFIELD, Colo. - Another phase of the U.S. 36 project begins Friday, with crews closing the highway at Wadsworth Parkway to install a series of heavy girders.

"We put the girders down, then on top of that we pour a concrete slab," construction manager Jason Estes said.

Each girder weighs about 111,000 pounds and is 120-feet long. The bridge, which should be done by September will expand turn lanes.

The closure begins March 22 and lasts 12 nights. The closure is from 9 p.m. to 5 :30 a.m. each night.

There are five bridges being constructed at Wadsworth, 112th, Sheridan, Lowell, and the Burlington Northern Santa Fe tracks.

The US 36 Express Lanes Project started in July 2012 and will be finished by January 2015. It is a $312 million project to build an express lane in each direction on US 36 from Federal Boulevard to 88th Street in Louisville/Superior. The lanes will accommodate High Occupancy Vehicles (HOV), Bus Rapid Transit and tolled Single Occupancy Vehicles. In addition, the project will replace several bridges, build a commuter bikeway, add Bus Rapid Transit improvements, and install Intelligent Transportation Systems (ITS) for tolling, transit, traveler information and incident management.