Drivers navigating the ongoing construction at 146th Street and Allisonville Road should prepare for a significant traffic pattern change set to begin on or after June 2, according to the Hamilton County Highway Department.
The next phase of the infrastructure project will make the new roundabout at the intersection operational, and one lane of 146th Street will reopen in each direction via the newly constructed bridge over Allisonville Road. Once this phase is in place, left turns—currently prohibited in all directions—will be allowed once again through the roundabout.
Until then, drivers are reminded to continue observing the 35 mph posted speed limit and to avoid making left turns at the intersection. The construction zone remains active, with periodic lane closures and temporary traffic stoppages expected as crews complete various work items.
“Please watch for flaggers and workers in and around the construction zone, and use extreme caution,” the department advised in its latest update.
Bridge rehabilitation and widening efforts continue on the westbound bridge over the White River. Warmer temperatures have allowed the contractor to resume key operations including grading, storm sewer installation, subgrade preparation, and paving.
Additionally, the bridge railing over Allisonville Road was completed in recent weeks, marking a notable milestone in the broader improvement project. Crews are also working on roundabout construction and barrier wall installation within the active work zone.
Construction vehicles will be entering and exiting the site frequently, so motorists are urged to stay alert and reduce speeds while driving through the area.
After the June traffic shift, westbound traffic on 146th Street will be divided over the White River bridge, with active construction continuing between travel lanes. The county cautions drivers to remain vigilant and allow time to adjust to the new traffic configuration.
County highway officials say the project is scheduled to be completed in the fall of this year.
The illustration below is provided by Hamilton County.
