Excellent downloadable project handbook and computer program for bridge design.
Online program to design truss bridges.
The history and principles of  truss
bridge design
Great site from the Deutsches Museum.
Interactive site with classroom resources
Great interactive resources from a PBS special
Full lesson plan for a bridge research project
Excellent collection of pictures
Includes pictures and detailed construction and bridge terminology
Collection of links to bridge picture galleries all over the world

Great site with short but concise explanations
Types of bridges and principles of structures
Organized by Truss Types
Very comprehensive information
Principles of Structures: Forces
Bridges explained
Record Span Lengths
Great site with short but concise explanations
Types of bridges and principles of structures
Organized by Truss Types
Very comprehensive information
Principles of Structures: Forces
Bridges explained
Record Span Lengths
BRIDGE PRINCIPLES

Excellent collection of pictures
Includes pictures and detailed construction and bridge terminology
Collection of links to bridge picture galleries all over the world
Excellent downloadable project handbook and computer program for bridge design.
Online program to design truss bridges.
The history and principles of  truss
bridge design
Great site from the Deutsches Museum.
Interactive site with classroom resources
Great interactive resources from a PBS special
Full lesson plan for a bridge research project
BRIDGE PROJECT RESOURCES
BRIDGE PICTURES