The National Bridge Inventory dataset is as of June 20, 2025 from the Federal Highway Administration (FHWA) and is part of the U.S. Department of Transportation (USDOT)/Bureau of Transportation Statistics (BTS) National Transportation Atlas Database (NTAD). The data describes more than 624,000 of the Nation's bridges located on public roads, including Interstate Highways, U.S. highways, State and local roads, as well as publicly-accessible bridges on Federal and Tribal lands. The inventory data presented includes information on the location, description, classification, and general condition for each bridge. The Recording and Coding Guide for the Structure Inventory and Appraisal of the Nation's Bridges (Coding Guide) contains a detailed description of each data element including coding instructions and attribute definitions. The Coding Guide is available at: https://doi.org/10.21949/1519105. For additional questions regarding regulations for the National Bridge Inventory or the Coding Guide please contact the National Bridge and Tunnel Inventory team at NBTIS_Support@dot.gov. For questions on the geospatial component of the dataset, contact the NTAD team at NTAD@dot.gov. A data dictionary, or other source of attribute information, is accessible at https://doi.org/10.21949/1519105

The NBI is a collection of information (database) describing the more than 600,000 of the Nation's bridges located on public roads, including Interstate Highways, U.S. highways, State and county roads, as well as publicly-accessible bridges on Federal lands. It presents a State by State summary analysis of the number, location, and general condition of highway bridges within each State.

This map service contains bridge data from the Massachusetts Department of Transportation Highway Division (MassDOT) Bridge Inspection Management System (BIMS). The data is refreshed from the BIMS database on a biweekly basis. Included in this layer are: • MassDOT and municipally-owned structures with spans greater than 20 feet. These are categorized as National Bridge Inventory (NBI) structures. MassDOT inspects NBI bridges on a biannual basis. • MassDOT Highway and municipally-owned short span bridges with spans between 10 to 20 feet. These are categorized as “BRI” structures. The first complete Inspection of the short span bridge inventory is currently in progress. • MassDOT Highway and municipally-owned Culverts with spans of 4 to 10 feet. This category is incomplete and an inventory effort is underway. Structures under Federal, other State entities or Private ownership are not contained in this layer. Also excluded are minor non-highway structures such as pedestrian and bicycle overpasses. Access and Use Constraints The Massachusetts Department of Transportation shall not be held liable for any errors in this data. This includes errors of omission, commission, errors concerning the content of the data, and relative and positional accuracy of the data. This data cannot be construed to be a legal document. Primary sources from which this data was compiled must be consulted for verification of information contained in this data.

The Railroad Bridges dataset was compiled on October 14, 2022 from the Federal Railroad Administration (FRA) and is part of the U.S. Department of Transportation (USDOT)/Bureau of Transportation Statistics (BTS) National Transportation Atlas Database (NTAD). A railroad bridge is defined as “Railroad bridge means any structure with a deck, regardless of length, which supports one or more railroad tracks, or any other undergrade structure with an individual span length of 10 feet or more located at such a depth that it is affected by live loads.” based on the Code of Federal Regulations (49 CFR Part 237). The FRA does not have a mandate to inspect railroad bridges: these inspections are required by the owner of the track. The FRA will use this railroad bridge dataset to determine the number of bridges per railroad, state, etc. and will assist in determining priority field activities.

Bridges-Rail in the United States According to The National Bridge Inspection Standards published in the Code of Federal Regulations (23 CFR 650.3), a bridge is: A structure including supports erected over a depression or an obstruction, such as water, highway, or railway, and having a track or passageway for carrying traffic or other moving loads. Each bridge was captured as a point which was placed in the center of the "main span" (highest and longest span). For bridges that cross navigable waterways, this was typically the part of the bridge over the navigation channel. If no "main span" was discernable using the imagery sources available, or if multiple non contiguous main spans were discernable, the point was placed in the center of the overall structure. Bridges that are sourced from the National Bridge Inventory (NBI) that cross state boundaries are an exception. Bridges that cross state boundaries are represented in the NBI by two records. The points for the two records have been located so as to be within the state indicated by the NBI's [STATE_CODE] attribute. In some cases, following these rules did not place the point at the location at which the bridge crosses what the user may judge as the most important feature intersected. For example, a given bridge may be many miles long, crossing nothing more than low lying ground for most of its length but crossing a major interstate at its far end. Due to the fact that bridges are often high narrow structures crossing depressions that may or may not be too narrow to be represented in the DEM used to orthorectify a given source of imagery, alignment with ortho imagery is highly variable. In particular, apparent bridge location in ortho imagery is highly dependent on collection angle. During verification, TechniGraphics used imagery from the following sources: NGA HSIP 133 City, State or Local; NAIP; DOQQ imagery. In cases where "bridge sway" or "tall structure lean" was evident, TGS attempted to compensate for these factors when capturing the bridge location. For instances in which the bridge was not visible in imagery, it was captured using topographic maps at the intersection of the water and rail line. TGS processed 784 entities previously with the HSIP Bridges-Roads (STRAHNET Option - HSIP 133 Cities and Gulf Coast). These entities were added into this dataset after processing. No entities were included in this dataset for American Samoa, Guam, Hawaii, the Commonwealth of the Northern Mariana Islands, or the Virgin Islands because there are no main line railways in these areas. At the request of NGA, text fields in this dataset have been set to all upper case to facilitate consistent database engine search results. At the request of NGA, leading and trailing spaces were trimmed from all text fields. At the request of NGA, all diacritics (e.g., the German umlaut or the Spanish tilde) have been replaced with their closest equivalent English character to facilitate use with database systems that may not support diacritics. The currentness of this dataset is given by the publication date which is 09/02/2009. A more precise measure of currentness cannot be provided since this is dependent on the NBI and the source of imagery used during processing.

The NBI System is the collection of bridge inspection information and costs associated with bridge replacements of structurally deficient bridges on and off the NHS. This data is collected under the auspices of the National Bridge Inspection Standards (NBIS) as prescribed by law. The NBI System collects the information that is used to determine eligibility for NHS projects, performance measure reporting, NHS penalty determination, and reporting to Congress. It supports oversight of the NBIS through various report tools, and provides data reporting that supports agency strategic goals.

Data in the NBI is used to meet legislative reporting requirements and provide bridge owners, the Federal Highway Administration (FHWA) and the general public with information on the number and condition of the Nation’s bridges.The National Bridge Inventory dataset is as of June 27, 2024 from the Federal Highway Administration (FHWA) and is part of the U.S. Department of Transportation (USDOT)/Bureau of Transportation Statistics (BTS) National Transportation Atlas Database (NTAD). The data describes more than 615,000 of the Nation's bridges located on public roads, including Interstate Highways, U.S. highways, State and county roads, as well as publicly-accessible bridges on Federal and Tribal lands. The inventory data present a complete picture of the location, description, classification, and general condition data for each bridge. The element data present a breakdown of the condition of each structural and bridge management element for each bridge on the National Highway System (NHS). The Recording and Coding Guide for the Structure Inventory and Appraisal of the Nation's Bridges contains a detailed description of each data element including coding instructions and attribute definitions. The Coding Guide is available at: https://doi.org/10.21949/1519105.

FRA develop a spatial point layer of the rail bridges over road and water. The bridges are a snapshot and is not an offical or complete inventory of all bridges. Railroads change ownership, railroads are abandoned, bridges are replaced, etc. therefore it cannot be relied upon as being accurate.

All bridges in Ontario are inspected every 2 years using the Ontario Structure Inspection Manual (OSIM) format. The weighted condition of all elements is summarized in the Bridge Condition Index (BCI). More details about the BCI can be found on the Bridge Safety page on the Ministry of Transportation website.

Bridges that were recently constructed or recently transferred to the Ministry of Transportation may not have been inspected in OSIM format yet.

*[OSIM]: Ontario Structure Inspection Manual *[BCI]: Bridge Condition Index

The NBI is an aggregation of State, Federal agency and Tribal government bridge and associated highway data submitted to and maintained by the Federal Highway Administration (FHWA). It contains inspection and appraisal data of more than 600,000 of the Nation’s highway bridges located on public roads in accordance with the National Bridge Inspection Standards. The NBI data is used to determine the condition of the Nation’s bridges that is included in reports to Congress, as a data source for executing various sections of the Federal-aid program which involve highway bridges, for assessing the bridge penalty provisions of Title 23 United States Code (U.S.C.) section 119, as the data source for the evaluation of bridge performance measures established in Title 23 U.S.C. section 150, to assist in the oversight of the National Bridge Inspection Program, as a data source to assess and inform the condition and funding needs of highway bridges, and for strategic national defense needs.

This file contains location and identification information for bridges in Oregon. This includes bridges owned by the state, cities, counties, and other owners such as railroad bridges that cross state highways. It does not include bridges that are owned by Federal agencies. A bridge is a structure including supports erected over a depression or an obstruction, such as water, highway, or railway, and having a track or passageway for carrying traffic or other moving loads and having an opening measured along the center of the roadway of more than 20 feet.Additional metadata resouce: https://geoportalprod-ordot.msappproxy.net/geoportal/catalog/main/home.page

Esri ArcGIS Online (AGOL) Feature Layer which provides access to the Maryland Bridge / Structures data product.Maryland Bridge / Structures data consists of point & linear geometric features which represent the geographic location & extent of bridge / structures along roadways throughout the State of Maryland. Maryland Bridge Structures data is owned & maintained by the MDOT SHA Office of Structures (OOS). Maryland Bridge Structures data is used by various transportation business units within MDOT, as well as many other Federal, State, & local government agencies. Maryland Bridge Structures data is key to understanding more about the bridge structures along roadways throughout the State of Maryland. Maryland Bridge / Structures data is updated daily by the MDOT SHA Office of Structures (OOS). Those updates are comprehensively published on a monthly routine basis. For additional information, contact MDOT SHA OIT Enterprise Information Services: Email: GIS@mdot.maryland.gov

New York City bridge structure conditions and ratings.

This map service provides general bridge information for all transportation structures within the Washington State Bridge Inventory System (WSBIS) in Washington State. This includes bridges, large culverts, tunnels, pedestrian & railroads passing over state routes, and pedestrian bridges adjacent to state routes on state right of way. The accuracy and completeness of the transportation structure data (including the structure location) are the responsibility of the structure owner. In cases where pedestrian & railroad structures pass over state or local agency routes, this data may be the responsibility of the route owner under the structure. Note that local agencies do not include a complete inventory of pedestrian & railroad structures in local agency rights of way. Please Note: If there is a vertical clearance restriction related to the bridge/structure, the minimum clearance will appear in either the MinVertClrncOverDeck, MinVertClrncUnderBridge or TunnelMinVertClrncOverRdBy10 fields. For more specific and detailed vertical clearance information please use the WSDOT Bridge Vertical Clearance Trip Planner: https://www.wsdot.wa.gov/Bridge/Structures/BVCTP.htm(Chrome Browser works best) Reference Document: Criteria for Identifying Bridge Condition Stateshttps://data.wsdot.wa.gov/geospatial/DOT_Bridge/WSDOTBridgeConditionStates_Criteria.pdf#page=1 Reference Document: Attribute Definition Guidehttps://data.wsdot.wa.gov/geospatial/DOT_Bridge/WSBIMCodingGuide_Appendix2C_2020.pdf If you have any questions about this data, please contact Dani Troupe, Bridge Preservation Office (BPO) – danielle.troupe@wsdot.wa.gov (360) 570-2562. If you're having trouble viewing these services, please email OnlineMapSupport@wsdot.wa.gov. Download individual data sets from https://gisdata-wsdot.opendata.arcgis.com

The NBI (NTAD 2015) is a collection of information (database) describing the more than 610,000 of the Nation's bridges located on public roads, including Interstate Highways, U.S. highways, State and county roads, as well as publicly-accessible bridges on Federal lands. It presents a State by State summary analysis of the number, location, and general condition of highway bridges within each State. Please note: 11,168 records in this database were geocoded to latitude and logtitude of 0,0 due to lack of location information or errors in the reported locations.

Bridges in the city of Pittsburgh.

This interactive map displays bridge information on publicly accessible roads across Kentucky, that are on the National Bridge Inventory.