Download files on the Seismic Design Parameters CD (Version 2.10) that accompanies the AASHTO Guide Specifications for LRFD Seismic Bridge Design (First Edition, 2009).
Site contains photos and information on various bridges across the United States. Hosted by the American Association of State Highway and Transportation Officials Subcommittee on Bridges and Structures.
The American Railway Engineering and Maintenance-of-Way Association. This site contains information pertaining to the design, construction and maintenance of railway infrastructure.
A vast inventory of suspension bridges containing history and photographs by David Denenberg.