Hamilton County opens new 146th St. & Allisonville Rd. interchange; awards $39.9M Hazel Dell contract to Carmel-based Gradex

Hamilton County officials gathered on Sept. 14, 2026, to cut the ribbon on the new interchange at 146th Street and Allisonville Road, marking the official completion of one of the county’s largest recent infrastructure projects. The county said the interchange had been open to traffic for several months while crews completed final paving, landscaping and other finishing touches over the summer of 2026.

The project replaced the former signalized intersection with a grade-separated interchange that includes a roundabout on Allisonville Road beneath 146th Street. County officials described the work as intended to improve safety, traffic flow and the overall level of service along the busy 146th Street corridor.

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