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Inside the Engineering of the DigIndy Tunnel System Project and Its Impact on Water Quality

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Indianapolis Marvels: DigIndy

Inside the Engineering of the DigIndy Tunnel System Project and Its Impact on Water Quality

2026-10-13 18:00:00 2026-10-13 19:30:00 America/Indiana/Indianapolis Indianapolis Marvels: DigIndy Join us in the Indianapolis Special Collections Room (ISCR) at the Central Library for a presentation on the DigIndy Tunnel System, one of the largest infrastructure projects in Indianapolis history. Featuring Mike Miller, MSCE, PE, from Citizens Energy Group. Central Library -

Tuesday, October 13
6:00pm - 7:30pm

Join us in the Indianapolis Special Collections Room (ISCR) at the Central Library for a presentation on the DigIndy Tunnel System, one of the largest infrastructure projects in Indianapolis history. Featuring Mike Miller, MSCE, PE, from Citizens Energy Group.

Culture, History, and Society: Historic IndianapolisThe DigIndy Tunnel System is one of (if not the) largest infrastructure projects in the history of Indianapolis. Citizens Energy Group built the tunnel system 250 feet below ground and with a diameter of 18 feet such that it will capture an estimated 5 billion gallons of wastewater overflow each year from the sewer systems of Indianapolis and direct the waste to treatment facilities for safe release. The captured waste would have otherwise entered the community’s waterways, and its elimination will be incredibly impactful for the river environments, water quality, and the public health of surrounding communities. This in-person presentation will cover the historical need for such a project; the evolution of its design; the interesting complexities of its construction; and what the program will now accomplish for our Indianapolis neighborhoods. Registration is required.

Presented by: Mike Miller, MSCE, PE, Manager (Technical Services & Construction) at Citizens Energy Group, has a rich background in the geotechnical engineering and construction industry. He has more than 25 years of professional experience, with the past 12 spent at Citizens Energy Group leading the program management of the $2 billion DigIndy Tunnel System. His expertise in geotechnical engineering (including investigations and instrumentation); earth support; temporary earth retention system design; and tunnel design has been crucial in the successful completion of DigIndy. He is a graduate of Michigan State University and a licensed Professional Engineer.

Age Group: Adults

Location: This program will be held in person in the Indianapolis Special Collections Room (ISCR) on the 6th floor of the Central Library.

Parking: The Central Library has a parking garage available to patrons during their time there. Garage pricing information is detailed hereThe garage can be accessed on Pennsylvania Street.

This program is part of the Culture, History, and Society: Historic Indianapolis programs hosted by the Indianapolis Special Collections Room (ISCR) at the Central Library. 

Contact: Special Collections Librarian Montoya Barker

Central Library

Phone: 317-275-4100

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As the hub of the Indianapolis Public Library system, Central Library showcases renowned architecture and services. The original 1917 building, designed by Paul Cret and constructed of Indiana limestone in the Greek Doric style, was considered one of the most outstanding secular buildings in the U.S. Its six-story glass and steel-framed addition, designed by Evans Woollen, opened in 2007.

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