About TWM2020-07-30T21:05:20+00:00

About TWM

As the 9th largest engineering firm in the entire St. Louis region, TWM, Inc. provides Civil, Structural & Rail Engineering, Land Surveying, and other Geospatial Services to both public and private sector clients in Illinois, Missouri, and beyond.

Over the last 74 years, we have diversified into five primary disciplines – Structures, Transportation, Land Development, Water Infrastructure, and Surveying/Geospatial. We draw upon the extensive knowledge, skills and experience of our licensed professionals, as well as our support staff, to consistently deliver cost-effective, innovative, and sensible solutions to the design challenges facing our clients.

Our employees are experienced and focus on solving your problems with accurate and cost-effective solutions. They care deeply about providing exceptional services to you as a client. Due to the solid reputation we have built for being able to get the job done right, we proudly retain approximately 95% of our clients’ business.

Visit our History page for more information.

“TWM was very responsive to changes by the local agency when they couldn’t make up their mind on the final design. Their team did an outstanding job developing the idea for using a diverging diamond interchange, selling the benefits to IDOT and Marion, and then designing it. TWM’s staff was thoughtful, intelligent, and required very little oversight.”

Charles Stein, PE, IDOT D9 Studies& Plans

“TWM continues to provide exceptional rail design services.  They have delivered solid quality work and responded quickly with solutions when unforeseen items have emerged.  TWM is ultra-responsive, and always returns my phone calls in a timely fashion.  I would recommend TWM because they have demonstrated they are able to consistently deliver on their promises.”

Andrew Matusak, PE, Senior Rail Engineer, OmniTRAX

“TWM has shown they are good partners and understand teamwork. TWM’s project manager has been very aware of the budget and timeline while keeping an ‘open ear’ for the needs of the entire project and keeping an eye on the accuracy and constructability of the final plans.”

Shirley Norris, PE, MoDOT Transportation Project Manager, Franklin/Jefferson Counties, MO

Exceptional Service. Nothing Less.


TWM continues the important business of supporting our nation’s essential infrastructure in these uncertain times. We are committed to our mission of providing Exceptional Service, Nothing Less to you, our clients and partners. As a professional services firm, the health of our employee-owners and their families is paramount. We are following government directives and public health guidance, implementing work-from-home and other social distancing and hand hygiene practices. We have employed additional technological resources to support our modified operating structure, and we expect to be able to do so with minimal disruption. If you need to visit our offices in person or have trouble reaching your TWM contact, please contact us at 618.624.4488 so we can make arrangements or put you in touch with the appropriate person. Thank you for placing your trust in TWM. Wishing you safety and good health.