Perhaps best known for our expertise in major bridge structures, Mahan has nearly forty years of experience in the design and construction of a wide range of bridge types, including welded steel girder, cable-stayed steel and concrete, long-span steel truss, railroad, precast concrete, and concrete segmental bridges, many of which involved marine-based construction operations in and over navigable waterways. Work Environment: While performing the duties of this job, the employee regularly works near moving mechanical parts and in outside weather conditions and is regularly exposed to wet, humid condition airborne particles, and extreme heat or cold.