TWM, Inc.

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TWM, Inc. TWM is a 100% employee-owned firm providing civil/structural engineering, land surveying, & other geospatial services.

For 80 years, we have served the public & private sector throughout IL, MO, TN, & across the US.

10/22/2026

In a game-winning move, this bridge slid into home with perfect control. TWM supported IDOT on this successful bridge slide, where a 108’ span was built off-line and then moved 39’ into its final position. Behind the move: precise engineering for temporary supports, geometry control, and jacking systems—carefully managing complex deflections to keep everything within tight tolerances.

Discover the details that mattered most in this project snapshot: https://buff.ly/BUVKjtN

🎉 Our 80th Anniversary year just keeps getting better! 🎉 We’re growing, and we’re excited to welcome so many new employe...
10/15/2026

🎉 Our 80th Anniversary year just keeps getting better! 🎉 We’re growing, and we’re excited to welcome so many new employee-owners to Team TWM! Help us give these new faces a warm welcome and say hello in the comments! 👋

TWM helped turn an adopted community vision into a place that connects recreation, accessibility, neighborhood connectiv...
10/13/2026

TWM helped turn an adopted community vision into a place that connects recreation, accessibility, neighborhood connectivity, environmental improvements, and a meaningful memorial.

Explore the story behind the transformation of Venable Memorial Park in this project snapshot: https://buff.ly/cwsJ2b2

We’re growing, and we’re proud to be recognized for it! 🎉TWM has been named one of the St. Louis Business Journal’s Fast...
10/08/2026

We’re growing, and we’re proud to be recognized for it! 🎉

TWM has been named one of the St. Louis Business Journal’s Fastest Growing Companies, recognizing companies based on revenue growth from 2023 to 2025. We were honored to celebrate alongside other growing organizations from across the region at last week’s awards event.

This recognition comes on the heels of another exciting milestone: TWM was also ranked #13 on the St. Louis Business Journal’s 2026 list of the region’s largest engineering firms.

Both honors reflect the continued growth of our team, the trust of our clients, and the hard work of our employee-owners across Illinois, Missouri, and Tennessee.

Learn more about the recognitions and what’s driving TWM’s growth: https://buff.ly/x2BOzGL

TWM had a fantastic time at our annual Ameren Illinois event at Busch Stadium! It was a great opportunity to step away f...
10/07/2026

TWM had a fantastic time at our annual Ameren Illinois event at Busch Stadium! It was a great opportunity to step away from the day-to-day, catch up with familiar faces, and enjoy an evening of Cardinals baseball together.

We’re grateful for the relationships we’ve built through the work we do and always enjoy opportunities to connect outside of the office. Thanks to everyone who joined us for a fun night! ⚾️

📣 Caught Ya’ Thinking Like an Owner! Join us in congratulating Michelle Schwierjohn, our September Employee-Owner of the...
10/06/2026

📣 Caught Ya’ Thinking Like an Owner! Join us in congratulating Michelle Schwierjohn, our September Employee-Owner of the Month! Michelle is a Geometrics/Traffic Engineer in the Transportation group at TWM. She was selected as Employee-Owner of the Month for her leadership, knowledge, and commitment to her fellow employee-owners. She leads complex geometric and traffic projects while also taking on the important role of teaching and mentoring others in this specialty. Her willingness to share her expertise and help others grow reflects the collaborative spirit of TWM.

When asked what employee ownership means to her, Michelle shared, “Employee ownership means knowing that everyone in the company wants each other to succeed and is willing to take accountability, because that ultimately contributes to both company growth and personal reward.” She continued, “It helps employees feel that their opinions are respected, valued, and taken into consideration. Employee ownership also creates a mindset where individuals feel empowered to take initiative, find ways to improve projects, and identify better ways of working that make processes more efficient and fluid.”

Thank you for your dedication and contributions, Michelle! Congratulations!

Our Geospatial Services team was excited to participate in Home Builders Remodelers Association's Trade Days at Triad Mi...
09/30/2026

Our Geospatial Services team was excited to participate in Home Builders Remodelers Association's Trade Days at Triad Middle School in Troy, IL last week! Our team members gave students hands-on tutorials featuring the equipment our land surveyors and technicians use to capture precise data in the field. The students were enthusiastic, curious, and engaged throughout the event, making it a truly rewarding experience for our team.

We visited with close to 950 students! It was a great day. We’re always happy to help introduce students to the many career opportunities available in the surveying and geospatial industry!

Before most fans saw race cars speeding across Nashville's Korean War Veterans Memorial Bridge, our surveyors saw millio...
09/29/2026

Before most fans saw race cars speeding across Nashville's Korean War Veterans Memorial Bridge, our surveyors saw millions of data points. Using advanced mobile LiDAR technology, our team mapped and analyzed the bridge surface and pavement conditions to ensure that one of the most unique sections of the course was race-ready!

Get a behind-the-scenes look at how TWM supported one of motorsports’ most memorable venues in this project snapshot: https://buff.ly/PnE1tLM

Sometimes, rethinking development means digging a little deeper. Rock City Underground Business Park transformed a forme...
09/23/2026

Sometimes, rethinking development means digging a little deeper. Rock City Underground Business Park transformed a former limestone mine into more than 1 million sq. ft. of unique commercial space—hidden entirely beneath the surface.

TWM has been part of the project from the very beginning, using 3D laser scanning to map the mine and support critical expansions like the National Archives facility. That innovative approach earned TWM an ACEC-IL Engineering Excellence Award. More than 20 years and 26 projects later, Rock City proves development doesn’t have to rise above ground to make an impact.

Unearth more details in this interesting project snapshot: https://buff.ly/sjU8R14

At first glance, it looks wrong. Eliminating left turns across traffic, reducing signal phases, and driving on the oppos...
09/18/2026

At first glance, it looks wrong. Eliminating left turns across traffic, reducing signal phases, and driving on the opposite side of the road. But that’s exactly the innovation behind a Diverging Diamond Interchange. Before DDI designs became common across the U.S., TWM helped bring the concept to Illinois for the very first time. Working with the City of Marion and IDOT District 9, our team helped transform the I-57 and The Hill Avenue interchange into a safer, more efficient gateway for a growing community.

Read more in this project spotlight about the story behind Illinois’ first DDI: https://conta.cc/3UIQtTa

Address

4940 Old Collinsville Road (HQ)
Swansea, IL

Opening Hours

Monday 8am - 5pm
Tuesday 8am - 5pm
Wednesday 8am - 5pm
Thursday 8am - 5pm
Friday 8am - 5pm

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