Road and Railroad Tunnels

Metadata Updated: September 2, 2021

Tunnels in the United States According to the HSIP Tiger Team Report, a tunnel is defined as a linear underground passageway open at both ends. This dataset is based on the U.S. Department of Transportation's National Bridge Inventory (NBI). Records in the NBI that are attributed as 'Tunnels' were extracted by TGS and were located using a combination of ortho imagery, topographic DRGs, NAVTEQ streets, and NAVTEQ railroads. Two points were captured for each tunnel, one at each tunnel opening. A line was then created either by tracing the NAVTEQ street / railroad, or, if there was not a NAVTEQ street / railroad coincident with the tunnel, then by a straight line joining the two points. For some tunnels, the NBI contains two records, one for the road through the tunnel and one for the road on top of the tunnel (if any). In these cases, both have been captured in this dataset. Features in this dataset that are over tunnels have a [RECTYPE] of '1', while features that are in tunnels have a [RECTYPE] of '2'. Presumably, this was done because both roads could be blocked if the tunnel was destroyed. In some cases, the NBI only represented a tunnel with a record of type = '1' (over). In these cases, the following rules were applied1) If there was no road running through the tunnel, the road on top of the tunnel was captured. For example, if a mine conveyor runs through the tunnel and a county highway runs on top of the tunnel, the county highway was captured. 2) If a road ran through the tunnel, then this road was captured and the [RECTYPE] was changed to '2'. The 'feature carried' and 'feature intersected' fields were also changed to be consistent with the feature actually captured. According to the U.S. DOT'Our reporting requirements do not extend to tunnels, therefore, any info we have should be considered incomplete.'

Access & Use Information

Restricted: This dataset can only be accessed or used under certain conditions. License: us-pd

Downloads & Resources


Metadata Created Date November 10, 2020
Metadata Updated Date September 2, 2021

Metadata Source

Harvested from DHS datajson source

Additional Metadata

Resource Type Dataset
Metadata Created Date November 10, 2020
Metadata Updated Date September 2, 2021
Publisher Under Secretary / Management
Unique Identifier Unknown
Identifier 2729
Data Last Modified 2021-08-04T00:00:00-04:00
Rights Continental United States, Alaska & Hawaii
Public Access Level restricted public
Bureau Code 024:010
Metadata Context
Schema Version
Program Code 024:000
Source Datajson Identifier True
Source Hash b798de6ade07e83e92b2c129a6f4e16359ba9c53
Source Schema Version 1.1

Didn't find what you're looking for? Suggest a dataset here.