Tables of Frequently Requested NBI Information
The following links utilize bridge data submitted annually to FHWA by States, Federal agencies, and Tribal governments, in accordance with the National Bridge Inspection Standards and the Specifications for the National Bridge Inventory (.pdf). Each data set is submitted in the spring and may be corrected or updated throughout the year. The data for public highway bridges is considered final and is archived by June 15th of each calendar year and published to this website shortly thereafter.
- Bridge Condition by Highway System, HTML | ZIP (354 kb)
- Bridge Condition by County, HTML | ZIP (9.9 mb)
- Bridge Condition by Functional Classification
- Bridge Condition by Owner, HTML | XLS (1.6 mb)
- Bridge Condition by Posting Status, HTML | XLS (896 kb)
- Bridge Condition by Year Built, PDF (22.3 mb) | XLS (832 kb)
- Bridge Replacement Unit Costs, HTML | ZIP (438 kb)
Historical Data
- Annual Materials Report on New Bridge Construction and Bridge Rehabilitation
- Bridges by Deck Structure Type
- Bridges by Wearing Surface
- Bridges by Year Built, Year Reconstructed and Material Type
- Bridge Mobility Performance Measures
- Bridges of Federal-Aid Highway and Non Federal-Aid Highway System
- Deficient Bridges by Highway System
- Deficient Bridges by Superstructure Material
- Deficient Bridges by Superstructure Type
Definitions
- Good (G), Fair (F), Poor(P): These terms are defined in accordance with the Pavement and Bridge Condition Performance Measures final rule, published in January of 2017. Bridge Condition is determined by the lowest rating of National Bridge Inventory (NBI) condition ratings for Item BC01 (Deck), Item BC02 (Superstructure), Item BC03 (Substructure), or Item BC04 (Culvert). If the lowest rating is greater than or equal to 7, the bridge is classified as Good; if it is less than or equal to 4, the classification is Poor. Bridges rated 5 or 6 are classified as Fair.
- Bridge Deck Area: This term is defined in accordance with the Pavement and Bridge Condition Performance Measures final rule, published in November of 2025. Bridge Deck Area is determined by multiplying Length (SNBI Item BG02) by Width (SNBI Item BG05). During 2026 and 2027 as the data is being transitioned from the Coding Guide to the SNBI, if SNBI Item BG05 (Bridge Width) is greater than or equal to 10 feet, this value is used for Width in the calculation. If SNBI Item BG05 is less than 10 feet or null, as in cases under the Coding Guide where the roadway is on a fill over the structure and headwalls do not affect the flow of traffic, SNBI Item BG09 (Approach Roadway Width) is used for Width in the calculation. Beginning in 2028, only SNBI Item BG05 will be used for Width in the calculation, regardless of its value. Bridge Deck Area is shown in square feet.
- Highway Bridge: A public vehicular structure having an opening measured along the center of the roadway of more than 20 feet between under copings of abutments or spring lines of arches, or extreme ends of openings for multiple boxes; it includes multiple pipes, where the clear distance between openings is less than half of the smaller contiguous opening. In data terms, BG01 NBIS Bridge Length.
- All codes for all items in the National Bridge Inventory can be found in the Specification for the National Bridge Inventory (SNBI) and its Errata located in the NBI Library: https://www.fhwa.dot.gov/bridge/nbi/library.cfm.
- Definition of the National Highway System (NHS) can be found at: https://www.fhwa.dot.gov/planning/national_highway_system/