History

John J. DiPonio turned his vision into reality, building a heavy civil tunnel construction company from the ground up.

Jay Dee takes on its first pipe jacking project in Chicago, Illinois, marking another milestone in underground innovation.

Following John J. DiPonio’s passing, the company evolved, splitting into two corporations, Jay Dee Contractors and Jay Dee Contractors of Illinois. Together, they forged a dynamic joint venture that spanned five years, carrying forward a legacy of innovation, resilience, and expertise in heavy underground construction.

After the passing of John J. DiPonio, Joseph took the helm as President, ushering in the next generation to carry forward the Jay Dee legacy.

The two companies reunited as Jay Dee Contractors, paving the way for the next generation to drive the legacy forward with fresh vision and unstoppable momentum.

Jay Dee pioneers Milwaukee’s first concrete segment tunnel, marking a major milestone in underground construction.

The second generation steps up, ready to lead Jay Dee into the next era of success.

As Jay Dee grew and expanded, we needed a headquarters to match our momentum. That’s when we built our first standalone office and yard, owned, designed, and built to fuel the future.

Jay Dee kicks off its first Design-Build project, combining innovation with efficiency to deliver results.

After 24 years of leading with vision and dedication, Mary steps down as Chairman.

Jay Dee breaks new ground with its first major rock tunnel project in Chicago, setting a new standard in underground construction.

Securing its first contract over $100 million, Jay Dee solidifies its position as a powerhouse in the tunnel construction industry.

Jay Dee pioneers its first modern Earth Pressure Balance (EPB) TBM project with a concrete segmental liner, redefining precision in tunnel construction.

Jay Dee takes on its first mass transit project, expanding its expertise and shaping the future of urban mobility.

Jay Dee tackles its largest U.S. project to date, setting a new benchmark for scale and ambition in the industry.

Jay Dee crosses borders with its first project in Canada, marking the start of a new chapter in international expansion.

The third generation steps up, bringing fresh vision and energy to lead Jay Dee into the future.