InfoBridge Documentation

NBI Coding Guide

The Recording and Coding Guide for the Structure Inventory and Appraisal of the Nations Bridges can be found here. Errata for the guide is located here. The guide is in metric units. Data in InfoBridge is presented in US customary units.

NBE Specification

Specification for the National Bridge Inventory Bridge Elements can be found here.

InfoBridge Brochure

Please click here to download the LTBP InfoBridge brochure in PDF format.

Condition Forecast Models

The bridge deck condition forecast models are products of on-going research. The documentation for each of the following three models will soon be available here:

  • Base Models
  • Survival Models
  • Machine Learning Models

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.