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National Tunnel Inventory (NTI)

Published by Federal Highway Administration | Department of Transportation | Catalog Last Checked: September 03, 2026 at 06:35 PM | Dataset Last Updated: September 03, 2026
The NTI is an aggregation of structure inventory and appraisal data of tunnels located on public roads submitted by States, Federal agencies and Tribal governments in accordance with the National Tunnel Inspection Standards (NTIS) which requires each State prepare and maintain an inventory of all tunnels. The NTI data is used as a data source to assist in the oversight of the National Tunnel Inspection Program and to respond to inquiries from different entities on the Nation’s tunnels.

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Complete Metadata
@type dcat:Dataset
accessLevel public
bureauCode 
[
  "021:15"
]
conformsTo https://www.fhwa.dot.gov/bridge/inspection/tunnel/snti/hif15006.pdf
contactPoint 
{
  "fn": "Office of Bridges and Structures",
  "@type": "vcard:Contact",
  "hasEmail": "mailto:bridgeofficialmailbox.fhwa@dot.gov"
}
dataQuality 
true
describedBy https://www.fhwa.dot.gov/bridge/inspection/tunnel/snti/hif15006.pdf
describedByType application/pdf
description The NTI is an aggregation of structure inventory and appraisal data of tunnels located on public roads submitted by States, Federal agencies and Tribal governments in accordance with the National Tunnel Inspection Standards (NTIS) which requires each State prepare and maintain an inventory of all tunnels. The NTI data is used as a data source to assist in the oversight of the National Tunnel Inspection Program and to respond to inquiries from different entities on the Nation’s tunnels.
distribution 
[
  {
    "@type": "dcat:Distribution",
    "title": "2018",
    "mediaType": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
    "downloadURL": "https://www.fhwa.dot.gov/bridge/inspection/tunnel/inventory/download/2018nti.xlsx"
  },
  {
    "@type": "dcat:Distribution",
    "title": "2019",
    "mediaType": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
    "downloadURL": "https://www.fhwa.dot.gov/bridge/inspection/tunnel/inventory/download/2019nti.xlsx"
  },
  {
    "@type": "dcat:Distribution",
    "title": "2020",
    "mediaType": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
    "downloadURL": "https://www.fhwa.dot.gov/bridge/inspection/tunnel/inventory/download/2020nti.xlsx"
  },
  {
    "@type": "dcat:Distribution",
    "title": "2021",
    "mediaType": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
    "downloadURL": "https://www.fhwa.dot.gov/bridge/inspection/tunnel/inventory/download/2021NTI.xlsx"
  },
  {
    "@type": "dcat:Distribution",
    "title": "2022",
    "mediaType": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
    "downloadURL": "https://www.fhwa.dot.gov/bridge/inspection/tunnel/inventory/download/2022NTI.xlsx"
  },
  {
    "@type": "dcat:Distribution",
    "title": "2023",
    "mediaType": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
    "downloadURL": "https://www.fhwa.dot.gov/bridge/inspection/tunnel/inventory/download/2023NTI.xlsx"
  },
  {
    "@type": "dcat:Distribution",
    "title": "2024",
    "mediaType": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
    "downloadURL": "https://www.fhwa.dot.gov/bridge/inspection/tunnel/inventory/download/2024NTI.xlsx"
  },
  {
    "@type": "dcat:Distribution",
    "title": "2025",
    "mediaType": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
    "downloadURL": "https://www.fhwa.dot.gov/bridge/inspection/tunnel/inventory/download/2025NTI.xlsx"
  }
]
identifier https://data.transportation.gov/api/views/euv9-yzr3
issued 2022-06-23
keyword 
[
  "tunnel inventory",
  "tunnels"
]
landingPage https://www.fhwa.dot.gov/bridge/inspection/tunnel/inventory.cfm
language 
[
  "en-US"
]
license https://www.usa.gov/government-works
modified 2026-09-03
primaryITInvestmentUII 021-012940226
programCode 
[
  "021:009"
]
publisher 
{
  "name": "Federal Highway Administration",
  "@type": "org:Organization"
}
spatial United States
systemOfRecords https://www.govinfo.gov/content/pkg/FR-2006-05-03/pdf/E6-6510.pdf
theme 
[
  "National Geospatial Data Asset Transportation"
]
title National Tunnel Inventory (NTI)

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