The roof is of arch braced queen post construction. The bridge is of queen post truss design. In roof construction such as king post, queen post, crown post framing. The arched queen post roof is covered with pegtiles. The roof of the courtroom is supported on queen post trusses. A diagonal brace runs between the top of the queen post and the outer edge. It consists of 10-span timber deck Queen Post truss viaduct, with each span measuring . The roof of the goods shed is supported on large timber queen post trusses. It is the last example of a queen post truss bridge extant in Michigan. It has a queen post roof and is thatched. The Queen post office closed Sept. 15, 1881. It was a , Queen post truss bridge constructed in 1887. Timber roof framing, including Queen post trusses with stop-chamfered edges, is exposed within the space. The floors and the queen post truss roof are supported by cast-iron columns. A king post uses one central supporting post, whereas the queen post truss uses two.