National Tunnel Inventory

The National Tunnel Inventory dataset was compiled on September 02, 2025 and published on August 26, 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 National Tunnel Inventory (NTI) is a collection of information (database) describing the more than 500 of the Nation's tunnels located on public roads, including Interstate Highways, U.S. highways, State and county roads, as well as publicly-accessible tunnels on Federal lands. The inventory data present a complete picture of the location, description, and classification data for each tunnel, as well as any load rating and inspection information. The Specifications for the National Tunnel Inventory (SNTI) contains a detailed description of each data element including coding instructions and attribute definitions. The Coding Manual is published for each year of data collection; the manual is available at: https://doi.org/10.21949/1519104. For additional questions regarding regulations for the National Tunnel 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/10.21949/1529051

Data and Resources

Field Value
access_constraints ["Access Constraints: unrestricted"]
bbox-east-long -65.873610999692914
bbox-north-lat 60.785659999908859
bbox-south-lat 18.008889000176772
bbox-west-long -157.855777779589
contact-email NBTIS_Support@dot.gov
coupled-resource []
dataset-reference-date [{"type": "creation", "value": "2019-07-01"}, {"type": "revision", "value": "2025-09-02"}]
frequency-of-update annually
guid National Tunnel Inventory
licence ["This NTAD dataset is a work of the United States government as defined in 17 U.S.C. \u00c2\u00a7 101 and as such are not protected by any U.S. copyrights.\u00c2\u00a0This work is available for unrestricted public use."]
metadata-date 2025-09-03
metadata-language eng; USA
metadata_type geospatial
old-spatial {"type": "Polygon", "coordinates": [[[-157.855777779589, 18.008889000176772], [-65.87361099969291, 18.008889000176772], [-65.87361099969291, 60.78565999990886], [-157.855777779589, 60.78565999990886], [-157.855777779589, 18.008889000176772]]]}
progress onGoing
resource-type dataset
responsible-party [{"name": "Federal Highway Administration (FHWA)", "roles": ["pointOfContact"]}]
spatial {"type": "Polygon", "coordinates": [[[-157.855777779589, 18.008889000176772], [-65.87361099969291, 18.008889000176772], [-65.87361099969291, 60.78565999990886], [-157.855777779589, 60.78565999990886], [-157.855777779589, 18.008889000176772]]]}
spatial-reference-system 3857
spatial_harvester true
Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
  • AmeriGEO
  • AmeriGEOSS
  • CKAN
  • GEO
  • GEOSS
  • National
  • North America
  • United States
  • atlas
  • condition
  • database
  • element
  • inventory
  • national
  • national transportation atlas database
  • ntad
  • point
  • transportation
  • tunnel
  • tunnel element
  • tunnels
  • usa
  • vector
isopen False
metadata_created 2025-09-23T19:18:38.155361
metadata_modified 2025-09-23T19:18:38.155366
notes The National Tunnel Inventory dataset was compiled on September 02, 2025 and published on August 26, 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 National Tunnel Inventory (NTI) is a collection of information (database) describing the more than 500 of the Nation's tunnels located on public roads, including Interstate Highways, U.S. highways, State and county roads, as well as publicly-accessible tunnels on Federal lands. The inventory data present a complete picture of the location, description, and classification data for each tunnel, as well as any load rating and inspection information. The Specifications for the National Tunnel Inventory (SNTI) contains a detailed description of each data element including coding instructions and attribute definitions. The Coding Manual is published for each year of data collection; the manual is available at: https://doi.org/10.21949/1519104. For additional questions regarding regulations for the National Tunnel 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/10.21949/1529051
num_resources 2
num_tags 23
title National Tunnel Inventory