McMAHON is a full-service engineering and architectural services firm established in 1909.  We are a privately-held company with a staff of over 150 dedicated professionals with diverse design capabilities.

McMAHON has a strong history of providing owners with cost-effective, innovative, and sustainable solutions.  McMAHON provides civil, environmental, water, wastewater, structural, electrical and industrial engineering, architectural and surveying services to public and private sector clients.  We have been the recipient of many design awards and recognized nationally as an Engineering News Record (ENR) Top 500 Design Firm and CE News Best 50 Civil Engineering Firms to Work For.

We operate from our corporate headquarters in Neenah, Wisconsin, with additional office locations in Machesney Park, Illinois and Valparaiso, Indiana.  From these locations, we have a strong local presence as well as national service capabilities.

As we celebrate 100-years in business in 2009, we would like to extend our gratitude to those who have placed their trust in McMAHON.

Your goals.  Your schedule.  Your budget.
Your project, delivered the McMAHON way.