Construction Services.

Dedicated to

David Mason + Associates engineers the foundation of communities by assessing, creating, and preserving essential infrastructure and facilities.  We are energized by the challenge, inspired by our people.


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Experience + Efficiency = Time-sensitive and Budget Conscious Deliverables

Exceptional Safety + Service = Low Risk and Peace of Mind

Latest Technology + Old-fashioned Hard Work = Added Value

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Jefferson National Expansion Memorial – Gateway Arch Grounds Renovations

Located in the City of St. Louis, Missouri the 193-acre Jefferson National Expansion Memorial (JNEM) is situated on the west bank of the Mississippi…

Heavy Underground Distribution Manholes & Vaults

In order to improve customer service and reliability throughout their service territory, Ameren is investing millions of dollars to make improvements to their heavy…


“I have worked with David Mason for more than thirty years. Whether as a client, consultant, or partner in construction work, David Mason has proven to be a consistent, high quality, productive team member providing professional services.”

Ron Wiese, Alberici

“HBK has worked on a multitude of projects in the utility industry with David Mason + Associates since 2011. From the beginning, we have considered DMA a great partner who shares our passion for providing the highest level of safety, quality and service in our work.”

Ron Kaminski

“David Mason + Associates has always provided the highest quality engineering, architectural and surveying work for the City of St. Louis at a reasonable cost. Their staff is very professional and works very hard to achieve total client satisfaction.”

Richard T. Bradley, PE, President City of St. Louis Board of Public Service

“SAK has been working with David Mason + Associates for over 5 years. In that time, they have demonstrated excellent reliability, quality and communication. SAK considers them a valuable partner and would highly recommend them to others. We look forward to continued work with David Mason & Associates in the future.”

Tim Bussen, General Manager, Central Region

“I have had the privilege of working with David Mason + Associates (DMA) for over 15 years on airfield projects at Lambert – St. Louis International Airport.  DMA is a vital part of our Lambert team and has been integral in our ability to provide consistent and effective service to the City of St. Louis.  While the quality of their work is always top notch it is their responsiveness and willingness to go the extra mile that makes them an essential team member for us.”

Ty Sander, Aviation Group Manager Crawford, Murphy & Tilly Engineers & Consultants

“…in discussing your survey with my designer, who goes through it thoroughly when laying out our alignments, he mentioned that the surveys we receive from DMA are consistently among the best we receive…..keep up the good work!”

April M. Giesmann, PE, CFM

“I have had the opportunity to work with David Mason + Associates on a variety of projects in the St. Louis region. We have worked together under a multitude of delivery methods from Design-Build to Hard Bid and they are a truly collaborative partner in any contract structure. They understand the needs of their clients and are a partner to the builders executing their designs. I look forward to future successes with DMA!”

Ryan Freeman, Vice President of Operations McCarthy Building Companies, Inc.

“I have had the privilege of working with David Mason + Associates (DMA) on two major league sports venues, Busch Stadium, home of the St. Louis Cardinals, and the St. Louis Riverfront Football Stadium project on behalf of the Governor’s Task Force effort to retain the Rams football team in St. Louis. DMA provided surveying and civil engineering services for both projects and their contribution was outstanding. Each project demanded precision and attention to detail and DMA delivered faultlessly, even in the face of extraordinary time constraints… This is a firm I would love to work with again.”

John Loyd, Owner’s Representative, Unlimited Projects

“David Mason + Associates have been a long time partner with St. Louis Lambert International Airport. The have worked on many different projects and have been an integral part of moving St. Louis Lambert forward. The most impressive thing I can say about David and his team is they treat the airport as if it were a company they own! They take the time to learn about what is important to us and how the work they are doing will fold into our 5 Year Strategic Plan and beyond. They have embraced St. Louis Lambert as a regional asset and have taken pride in ensuring our success long term.”

Rhonda Hamm-Niebruegge, Airport Director, St. Louis Lambert International Airport

David Mason + Associates has played an important role in Forest Park’s comeback story, providing engineering services during the foundational 1995 Master Planning process for the Park. Decades later, DMA continues to serve the Park, providing on-call engineering services for Forest Park Forever’s Department of Planning & Projects. DMA’s Ehrin Sleet quickly gained the trust of our team, exhibiting a commitment to quality of work, accountability, productivity and communication, while helping to achieve results on the projects needed to advance our conservancy’s mission to restore, maintain and sustain Forest Park in partnership with the City of St. Louis. This recent series of work, which began in 2016, has been so positive that it resulted in additional contracts and an expansion of duties. We are pleased to have David Mason & Associates continuing to contribute to the success of Forest Park, which has become both a regional treasure and an urban park of national and international renown. 

Lesley S. Hoffarth, P.E., President and Executive Director, Forest Park Forever

David Mason + Associates is an exceptional business partner of Burns & McDonnell.  For over a quarter of a century, Burns & McDonnell and DMA have worked together on a number of successful projects, ranging from transportation and water/wastewater to facilities and electric utility projects.  I/we have always been able to count on them to come through for us and the clients we serve.

Breck R. Washam, P.E. Vice President, Burns & McDonnell

David Mason + Associates is a trusted firm that has played key roles in the design and construction of some of the most prominent and challenging projects in the St. Louis region.  They were critical in the success of the City Arch River renovation in downtown St. Louis, including MoDOT’s Park over the Highway project.

Gregory J. Horn, P.E. Saint Louis District Engineer Missouri Department of Transportation