Clarence Hull started working for his father in the earth moving business when the term “heavy machinery” meant horses. His position in the company involved associated concrete work, such as construction of headwalls and culverts, and by the late 1940s that role evolved into his own proprietorship.

In the early 1950s, Clarence hired a young engineer named Don Malloure to assist him in his efforts. Malloure had attended the University of Michigan for a degree in Civil Engineering on the G.I. Bill after serving in the U.S. Navy. Soon after he started work, Don approached Clarence about an employment arrangement that included an ownership provision in which Malloure would acquire the balance of the company over ten years. The execution of this agreement rested on the outcome of an upcoming letting by the Michigan State Highway Department (MSHD); without a winning bid, Clarence Hull planned to sell the business and retire. The proposal to build a bridge that would carry what is now I-75 over a rail spur in Monroe County was a success, and in 1954 C.A.Hull was incorporated. By 1965, Malloure had acquired 100% ownership of the company, and in 1966 when Clarence passed away, the future of the company laid solely on Don's shoulders.

C.A. Hull continued to grow and thrive into the 1970s, when Don Malloure's three sons, (Joe, John and Paul), began working for the company as engineers. Eventually, Joe became President, John and Paul became Vice Presidents, and the company evolved into one of the largest bridge-building firms in Michigan. Today, the foundation that was laid over a half-century ago is as strong as ever. Joe, John and Paul are still active with the company and have been joined by two other engineers and Vice Presidents, Mike Malloure (a third generation Malloure) and Dave Turner.