Oates Associates. is a multi-disciplined company providing civil and structural engineering and architectural services from concept through construction services. We have operated in the Midwest since the mid-1970s with an office in the St. Louis Metro East area since 1980. In 2006 we opened an office in Downtown St. Louis.


Contact Details

  City Collinsville, IL
  Zip Code 62234
  Address 100 Lanter Court
  Phone Number (618) 345-2200

From Our Website

We design spaces that you experience every day. From highway overpasses to athletic fields, we solve problems and create constructible and environmentally conscious solutions that focus on the community. From transportation to building infrastructure, Oates Associates has you covered. Our professionals are experts in their field, and are immersed in every project they take on, no matter the size. We build trusted partnerships based on integrity and responsiveness. Let us show you what we can do for you.


Oates Associates is founded on a culture of trust and dedication. This is represented at our core - through our staff. Project managers who began working at the firm in the 1980s and 1990s have grown into leadership roles, and are working together to this day. We are a team working together with you, from conceptual design to construction. Since we opened our doors nearly forty years ago, we have worked with hundreds of clients in the Midwest on projects large and small. Because of our dedication to building a capable team of engineers who are passionate about serving our community, we have built a reputation for doing great work and completing assignments on time and on budget.


If you need an engineer to assist in site selection, evaluate infrastructure in place, or survey land for a new development, Oates Associates can help. Our engineers work with you to create places that become part of their surroundings rather than intrude on them. We consider the practical along with the aesthetic.


Thoughtful community planning respects all aspects of the community to positively impact the quality of life. Our experts develop solutions that are balanced and focused on considering economic development, environmental stewardship, infrastructure impacts, social responsibility and aesthetic qualities that are present or envisioned.


Thoughtful planning and engineering are crucial to navigate the ever-increasing demand on our transportation infrastructure. Oates Associates works with communities and government agencies to implement realistic solutions for growing transportation concerns, from local street reconstructions to full development of new interstate highway systems.