Steelbridges.org has an online Steel Bridge Design Handbook. The initial Chapters and Design Examples of the renamed Steel Bridge Design Handbook are available for download on their website. The examples are quite informative.
The original Highway Structures DesignHandbook was produced by US Steel in the 1970s. The project was subsequently taken over by AISC Marketing. Now, with federal grant money, NSBA with HDR Engineering, Pittsburgh, PA as the Principal Engineer, is undertaking the much-needed updating of this important industry document. Eventually, it will encompass 23 chapters and seven Design Examples. The chapters are being written by prominent engineers in the field and reviewed by a committee organized by NSBA. Comments are compiled by NSBA, returned to the authors for revisions, and then finalized by NSBA.
Head on over to see it: http://www.steelbridges.org/contentNSBA.aspx?id=20244