Sheppard, Morgan & Schwaab, Inc. (now part of TWM)
Authored the downtown Alton permanent floodwall alignment that the USACE St. Louis District evaluated as Option 5 in its 2023 Flood Risk Reduction Study - the report names the firm directly. Also a named levee system design firm for the Southwestern Illinois Flood Prevention District. Seven licensed PEs, several dual-licensed in Illinois and Missouri.
Who runs it
- Scott J. Weiner ✓ PE (IL, MO) - President
- Charles A. Sheppard ✓ PE (CO, IL, IA, KY, MO) - Chairman of the Board
Credentials & verification
- Years in business
- 125 years
Services
Service area
Alton IL · Madison County IL · Jersey County IL · Metro East Illinois · Greater St. Louis
Our verification notes
Corporate change to note: the firm joined TWM in March 2026, keeping its identity and its Alton office. The same USACE Alton study evaluates dry floodproofing address by address for non-residential buildings on West 3rd Street, which is exactly the work a floodproofing certificate signer performs - a rare public document showing the analysis in the open. No CFM is published for any staff member, so none is claimed.
Sources checked
- https://cityofaltonil.gov/wp-content/uploads/2024/08/Alton-FPMS-Final-Report-14JUN2023.pdf
- https://www.floodpreventiondistrict.org/project-team/
- https://www.advantagenews.com/news/local/alton-holds-flood-wall-open-house/article_094683c6-f570-11ef-8a4e-9b186b999bb8.html
- https://www.twm-inc.com/twm-expands-team-and-regional-presence-with-addition-of-sheppard-morgan-and-schwaab-inc/
Last verified 2026-08-13. This is an independent listing, not an endorsement, and we are not affiliated with Sheppard, Morgan & Schwaab, Inc. (now part of TWM). Confirm the current license, insurance and references directly before signing any contract.
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