The bridge's construction starts at the bottom with the substructure, which includes deep foundations and concrete supports called bents. Construction on these bents started in the summer of 2025, and nearly half have already been completed.
Resting on these supports will be massive prestressed concrete beams. These beams range from 54 to 74 inches tall and from 120 to 165 feet long. They are designed to withstand heavy traffic loads and minimize long-term maintenance.
Bridge beams are part of the main event throughout the spring for the I-285/I-20 West Interchange, with the delivery and installation of the first beams beginning in late February! This is an exciting milestone for the project as this and the neighboring flyover ramp from I-285 northbound to I-20 westbound start to take shape.
Initially, beams will be set within the interchange and in March, beam setting activities will move to the spans over I-285 and I-20. Stay tuned to the project website and weekly traffic impacts for the anticipated timing of this work and overnight traffic pacing operations.
Big Beams, Tight Spaces
Delivering and staging the massive bulb tee beams is a major operation that will begin this spring. These beams-some stretching well over 100 feet long and weighing tens of tons-are fabricated off-site and transported to the project using specialized multi-axle trucks. Because of their size, deliveries are carefully scheduled during off-peak hours and often at night to reduce impacts to the traveling public.
Once on site, the beams are staged along the side of the interstate in designated areas, where crews prepare them for installation. Large cranes then carefully lift each beam into its final position, threading them between live traffic lanes and existing structures with precision that leaves little room for error. This carefully choreographed process is a critical step in bringing the flyover ramp to life.
Placing the Deck: Where It All Comes Together
Once the beams are set in place, crews will begin building the bridge deck, which is the concrete slab that forms the driving surface. Steel reinforcing bars are installed across the top of the beams, creating a strong framework. Then, ready-mix concrete is placed over the beams to form a solid, continuous deck.