Specification for the National Bridge Inventory Bridge Elements can be found here.
Please click here to download the LTBP InfoBridge brochure in PDF format.
American Wood Protection Association (AWPA) Wood Deterioration Hazard Zone Map
The following map shows different Deterioration Hazard Zones for Timber Bridges:
Major regional differences in potential for deterioration of wood used in contact with the ground are shown in this figure. In certain modified environments such as banks along irrigation canals or irrigated residential or agricultural lands, a higher degree of protection might be needed than would be required in the local natural environment. It must also be recognized that within individual regions, certain natural environments such as river valleys or coastlines may present greater potential for wood deterioration than the region as a whole.