Structurae - use the search bar to find information on specific bridges.
Types of Bridges - American Institute of Architects
Bridges and Tunnels - Explain that Stuff - information on different types of bridges.
Bridge Engineering - Encyclopedia Britannica - Information on types of bridges and their construction. Use the 'Search Britannica' bar in the upper right hand corner to search specific bridges.
Citations
Easybib - Great website, creates citations for Works Cited pages and bibliographies.