Are You Looking for Engineers in Decatur, IL?

Mann Engineering & Surveying provides civil engineering and land surveying services for infrastructure, development, and environmental projects across Central Illinois. We deliver precise designs, compliant permitting, and fieldwork tailored to client timelines and budgets. With decades of experience and hands-on oversight, we ensure reliable solutions for public and private sector clients.

Chastain & Associates is a full-service civil engineering and construction management firm specializing in transportation infrastructure, municipal projects, and land development. Since 1954, we've delivered over 200 transportation projects for state agencies while maintaining a client-centric approach that emphasizes technical excellence and community impact. Our services span from initial design through construction completion, serving municipalities, industrial clients, and state transportation departments across the Midwest.