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National Tunnel Inventory (NTI)

Metadata Updated: December 7, 2023

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.

Access & Use Information

Public: This dataset is intended for public access and use. License: See this page for license information.

Downloads & Resources


Metadata Created Date July 22, 2022
Metadata Updated Date December 7, 2023

Metadata Source

Harvested from DOT Socrata Data.json

Additional Metadata

Resource Type Dataset
Metadata Created Date July 22, 2022
Metadata Updated Date December 7, 2023
Publisher Federal Highway Administration
Data First Published 2022-06-23
Language en-US
Data Last Modified 2022-07-07
Category National Geospatial Data Asset Transportation
Public Access Level public
Bureau Code 021:15
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Data Standard
Data Dictionary
Data Dictionary Type application/pdf
Harvest Object Id 644b4841-e8ad-404d-ac5c-253f6e8f151d
Harvest Source Id a776e4b7-8221-443c-85ed-c5ee5db0c360
Harvest Source Title DOT Socrata Data.json
Homepage URL
Old Spatial United States
Program Code 021:009
Source Datajson Identifier True
Source Hash cd866170a653a5a8a853d51845cc9ec5995ad274446768c5d6ebd66189239a26
Source Schema Version 1.1
Spatial {"type":"Polygon","coordinates":-124.733253,24.544245,-124.733253,49.388611,-66.954811,49.388611,-66.954811,24.544245,-124.733253,24.544245}

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