A bridge is constructed using simply structured, longitudinal, modular deck sections or cells that are fabricated in a shop and shipped to the jobsite for quick assembly and erection. Each section has generally horizontal upper and lower members and at least one generally vertical member connected between the upper and lower horizontal members. The sections may be C-shaped, Z-shaped, or shallow U-shaped, and are connected in series. The upper and lower horizontal members of each section overlap respectively portions of the upper and lower horizontal members of the adjacent section to form overlapped regions. The connection sections define a plurality of closed cells. Open cells at the ends may be closed using appropriate end section(s) that may be shallow C-shaped or J-shaped. The sections are roll-formed or press braked from metal sheets or plates. The sections are connected together to form a multi-cell box girder bridge module by mating and welding or bolting the overlapped regions. Various corrugations or support plates may be added for strength. A bridge system may be formed by a single bridge module or by connecting a plurality of bridge modules.
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