Try these sites to assist your search for information on Bridges.

Bridge Construction

http://www.emints.org/ethemes/resources/S00001511.shtml

http://www.crsi.org/transportation/bridge_types.html

http://library.thinkquest.org/J0113129/DB~1.HTM

http://www.mmem.spschools.org/grade3science/3.bldg/building1.html

http://www.concretecentre.com/main.asp?page=151

http://volweb.utk.edu/Schools/bedford/harrisms/bridges.htm

http://www.mediaworkshop.org/ashs/lattimore/stress2.html

http://bridgepros.com/learning_center/

http://www.zum.de/earthquake/bridges.html

Bridge Information and photo's

http://www.nireland.com/bridgeman/

http://william-king.www.drexel.edu/top/bridge/CBTT.HTML

http://www.bergen.org/AAST/Projects/Engineering_Graphics/2004/Bridge/history.html      

Sites with other links

http://www.brantacan.co.uk/bridgedefs.htm

http://members.aol.com/chopstcks/interest/bridges.htm

http://www.engr.utexas.edu/wep/COOL/AcidRiver/links.htm

http://www.2learn.ca/search/NetStepView.asp?PID=2782

Materials

http://www.civil.utah.edu/~blaser/MM_project/structures/types.htm