Thouvenot, Wade & Moerchen, Inc. ENGINEERS-ELECTRONIC/CIVIL/ENVIRONMENTAL/MECHSURVEYORS Thouvenot, Wade & Moerchen, Inc. Visit Website 4940 Old Collinsville Road Swansea, IL 62226 (618) 624-4488 (618) 624-6688 (fax) Hours: Monday - Friday, 8 a.m. to 5 p.m. About About For 60+ years, TWM has provided Southern Illinois and the St. Louis area with Civil and Structural Engineering, Land Surveying and Planning services. Our Mission: Exceptional Service. Nothing Less. ShareTweetShare0 Shares ShareTweetShare0 Shares