Downtown Miami’s sweeping freeway rebuild reached two tangible milestones this month as crews began constructing a major retaining wall for the I-395 Signature Bridge and completed one of the project’s largest concrete pours, according to the Florida Department of Transportation. The $866 million I-395/SR 836/I-95 Design-Build Project — a partnership between FDOT, the Greater Miami Expressway Agency and contractor Archer Western–de Moya Group Joint Venture — remains on schedule for completion in late 2029.
The first advance concerns the engineering handoff between ground and sky. FDOT began building a Mechanically Stabilized Earth wall designed to support westbound traffic as it transitions from the MacArthur Causeway onto the new elevated Signature Bridge. The structure uses concrete panels on the outside with layers of reinforced fill behind them, straps extending back into the embankment so that each added layer strengthens the whole — effectively building the ramp that will gradually raise the roadway to the bridge deck, which will span Northeast Second Avenue and Biscayne Boulevard on a spider-like arch.
The second milestone was a display of logistics muscle just west of the Miami River. Crews completed a major concrete pour for the new double-decked SR 836 roadway using one pump and roughly 60 trucks to place 590 cubic yards — about 2.4 million pounds — in a single operation. Across the corridor, FDOT reports that about 138 million pounds of concrete have been used so far to replace existing pavement, along with new concrete pavement from NE 17th to NW 29th streets and along northbound I-95 from NW Eighth to NW 17th streets.
The project’s full scope includes an upper deck of traffic built over SR 836 and the Miami River and an added lane on the northbound I-95 entrance, all aimed at adding capacity and improving access through one of the region’s most congested interchanges. Overnight closures of the I-95 ramps to westbound SR 836 are continuing between 10 p.m. and 5:30 a.m. with marked detours, and crews are installing intelligent transportation system devices and retrofitting traffic railings on several bridges.
For downtown Miami’s business community, the build is a familiar bargain: years of detours, ramp closures and construction traffic in exchange for a rebuilt gateway to the Arsht Center district, Midtown and the beaches. The Signature Bridge’s sculptural arches have become the project’s marquee image, but the underlying economics are about freight and commute time — Miami’s port, airport and hospital district all feed through this interchange. With completion targeted for late 2029, the project enters its middle years with structural work now visibly rising above street level, a signal to adjacent developers that the disruption phase is finite even as the traffic phase continues. Overnight detour routes currently channel drivers onto surface streets including NW Seventh Avenue and NW 17th Avenue, and freight operators moving goods between the port and the airport are advised to plan around the recurring closures.
