The Texas Department of Transportation (TxDOT) maintains a spatial dataset of roadway polylines for planning and asset inventory purposes, as well as for visualization and general mapping. This dataset covers the state of Texas and includes on-system routes (those that TxDOT maintains), such as interstate highways, U.S. highways, state highways, and farm and ranch roads, as well as off-system routes, such as county roads and local streets. Route segments in this version of TxDOT Roadways are broken by functional classification. For an unsegmented version of TxDOT Roadways, see TxDOT Roadways Unsegmented.

This data contains measures. Measures are stored as M-values within each vertex along the line, in the same way that some datasets store z-values for the elevation, except that measures store the distance from the origin, or DFO, along the line. M-enabled networks serve as frameworks for locating roadway assets along the network using linear referencing. This data set must be downloaded as a file geodatabase in order to keep M-Values intact. If downloaded as a shapefile or added to a map from a connection to ArcGIS online, measures will not be applied to the line.

Update Frequency: Monthly

Source: Geospatial Roadway Inventory Database (GRID)

Security Level: Public

This resource contains statewide networks of roadways, railroads, bridges, and low-water crossings, for Texas only.

Roadways detail: The Transportation Planning and Programming (TPP) Division of the Texas Department of Transportation (TxDOT) maintains a spatial dataset of roadway polylines for planning and asset inventory purposes, as well as for visualization and general mapping. M values are stored in the lines as DFOs (Distance From Origin), and provide the framework for managing roadway assets using linear referencing. This dataset covers the state of Texas and includes on-systems routes (those that TxDOT maintains), such as interstate highways, U.S. highways, state highways, and farm and ranch roads, as well as off-system routes, such as county roads and local streets. Date valid as of: 12/31/2014. Publish Date: 05/01/2015. Update Frequency: Quarterly.

Bridges detail: As with the roadways, both on-system and off-system bridges are maintained in separate datasets (54,844 total bridges, 36,007 on-system and 18,837 off-system). Bridges have numerous useful attributes, see coding guide [1] for documentation. One such attribute identifies structures that cross water: the second digit of Item 42 “Type of Service”. If the second digit is between 5 and 9 (inclusive) then the structure is over water. The bridges datasets are valid as of December 2016.

The roadways and bridges datasets contained here were obtained directly from TxDOT through personal correspondence. An additional transportation data resource is the Texas Natural Resources Information System (TNRIS) [3]. The railroads and low-water crossings were obtained through TNRIS.

November 2023 updates: in the years since this data archive was first published, TxDOT has developed an open data portal for downloading their roadway inventory and other datasets. Also, in 2023 TNRIS was renamed as the Texas Geographic Information Office (TxGIO). Their datahub [3] is continually evolving, but still has the tnris.org domain for now. We are not updating any of the basemap data in the contents list below, which was current at the time of Hurricane Harvey.

References [1] TxDOT Bridges Coding Guide (download below) [2] TxDOT Open Data Portal [https://gis-txdot.opendata.arcgis.com/] [3] TNRIS/TxGIO data downloads [https://data.tnris.org/]

The Texas Department of Transportation (TxDOT)maintains a spatial dataset of roadway polylines for planning and assetinventory purposes, as well as for visualization and general mapping. Thisdataset covers the state of Texas and includes on-system routes (those thatTxDOT maintains), such as interstate highways, U.S. highways, state highways,and farm and ranch roads, as well as off-system routes, such as county roadsand local streets.This data contains measures. Measures are storedas M-values within each vertex along the line, in the same way that somedatasets store z-values for the elevation, except that measures store thedistance from the origin, or DFO, along the line. M-enabled networks serve asframeworks for locating roadway assets along the network using linearreferencing. This data set must be downloaded as a file geodatabase in order tokeep M-Values intact. If downloaded as a shapefile or added to a map from aconnection to ArcGIS online, measures will not be applied to the line.Update Frequency: 1 MonthsSource: Geospatial Roadway Inventory Database (GRID)Security Level: PublicOwned by TxDOT: TrueRelated LinksData Dictionary PDF [Generated 2025/04/24]

This layer is sourced from maps.dot.state.tx.us.

The TxDOT DCIS Projects service layer is a dataset of roadway construction and maintenance projects that are either currently under construction, or are in some phase of the planning process. Projects are grouped into 4 categories: projects that are currently underway or begins soon; projects in the construct authority (begins within the next four years); projects in the develop authority (planned to begin in 5 to 10 years); and projects in the initial phases of project development (corridor studies, construction in 10+ years). The dataset excludes non-letting projects. Update Frequency: 7 DaysSource: TxDOT Connect (TxC)Security Level: PublicOwned by TxDOT: TrueRelated LinksData Dictionary PDF [Generated 2025/05/21]

This layer is sourced from maps.dot.state.tx.us.

This dataset was created by the Transportation Planning and Programming (TPP) Division of the Texas Department of Transportation (TxDOT) for planning and asset inventory purposes, as well as for visualization and general mapping. It is comprised of all 25 TxDOT Districts. This layer was recently updated to include the district types: Rural, Metro and Urban.Update Frequency: As NeededSource: Transportation Planning and Programming Division (TPP) | Data ManagementSecurity Level: PublicOwned by TxDOT: TrueRelated LinksData Dictionary PDF [Generated 2025/03/17]

Programmatically generated Data Dictionary document detailing the TxDOT Future Texas Toll Roads service.

    The PDF contains service metadata and a complete list of data fields.
    For any questions or issues related to the document, please contact the data owner of the service identified in the PDF and Credits of this portal item.


  Related Links
  TxDOT Future Texas Toll Roads Service URL
  TxDOT Future Texas Toll Roads Portal Item

This layer is a component of HBA Statewide 01.

HBA Map Data

The TxDOT Roadway Inventory 2018 layer is a statewide dataset that has attribute information routed to TxDOT Roadway linework. By using linear referencing tools, attribute information from the TxDOT Roadway Inventory table are located on the linework. Roadway attributes such as functional system, traffic counts, surface types among many others can be found on a roadway simply by selecting it or performing a query. The TxDOT Roadway Inventory layer can also be found on www.TxDOT.gov and TxDOT’s Open Portal. This product is created annually by the Transportation Planning and Programming Division at TxDOT in the Data Analysis, Mapping and Reporting Branch for internal and public use.Update Frequency: 1 YearsSource: Geospatial Roadway Inventory Database (GRID)Security Level: PublicOwned by TxDOT: TrueRelated LinksData Dictionary PDF [Generated 2025/04/24]

This layer is a component of HBA Statewide 01.

HBA Map Data

Help document describing how to use the TxDOT Historic Resources Aggregator to generate reports from selected data and a list of explanations for the data sources referenced in the web mapping application. The process or processes for selecting data and creating a printable map or customized report is explained to allow users to create necessary documentation to use for projects and reports. The Help Document shows an itemized list of web tools with explanations of their purpose on the opening web page. Adding additional data from another source is described in detail with a list of valid data types and the steps to using the added data on the web mapping application. Using the print widget is covered so users can configure a map or data query report to be printed in the style that will best serve their purposes. Also, running the Screening Tool is covered in order for users to search for and isolate the data results that they need. Drawing points, lines and polygons on the web mapping application or using an external shapefile is explained so users can limit the location and number of records returned. Finally, a glossary is included to give users a summary of the data sets that are utilized in the TxDOT Historic Resources web mapping application.

The original dataset was created by Aviation Division and modify by the Transportation Planning and Programming Division of TxDOT in the Data Analysis, Mapping and Reporting Branch for planning and asset inventory purposes, as well as for visualization, county map book, and general mapping. This dataset contains information about airport name, ownership, county, district, and the Federal Aviation Administration (FAA) facility numbersUpdate Frequency: As NeededSource: Federal Aviation Administration (FAA)Security Level: PublicOwned by TxDOT: FalseRelated LinksData Dictionary PDF [Generated 2025/03/14]

This dataset contains all open tolls as of the end of 2022 for on-system (state owned) and off-system (privately owned) tollways in Texas.Update Frequency: AnnuallySecurity Level: PublicUpdate Frequency: As NeededSource: Geospatial Roadway Inventory Database (GRID)Security Level: PublicOwned by TxDOT: FalseRelated LinksData Dictionary PDF [Generated 2025/03/26]

The Transportation Planning and Programming (TPP) Division of the Texas Department of Transportation (TxDOT) created and maintains this dataset as a repository for all highway designation changes approved by the Texas Transportation Commission (the Commission), as documented in the "Minute Orders." This dataset includes additions and updates to, and removals from, the state highway system as approved by the Commission.Date valid as of: May 2015Publish Date: May 2015Update Frequency: Monthly

Network of Texas Railroads pulled from the Federal Railroad Administration (FRA) North American Rail Network (NARN) Rail Lines publicly available data. The data was clipped to the Texas State Boundary and queried to a records subset based on "current status or condition of rail line" as populated in the "NET" attribute. Additional fields were added and populated to adhere to TxDOT requirements and purposes.Update Frequency: 1 MonthsSource: Federal Railroad Administration (FRA)Security Level: PublicOwned by TxDOT: FalseRelated LinksFRA NARN Source DataTexas Railroads (Deprecated)Data Dictionary PDF [Generated 2025/04/29]

Max Speed limit values in miles per hour. This data is an extract from the Geospatial Roadway Inventory Databse (GRID), which is TxDOT's system for managing roadway assets in Texas.Note: Extracts from GRID are made on a regular basis and reflect the state of the data at that moment. Assets on routes that are in the process of being edited may be affected.Update Frequency: 1 MonthsSource: Geospatial Roadway Inventory Database (GRID)Security Level: PublicOwned by TxDOT: TrueRelated LinksData Dictionary PDF [Generated 2025/04/24]

The Texas Department of Transportation (TxDOT) maintains a spatial dataset of roadway polylines for planning and asset inventory purposes, as well as for visualization and general mapping. This dataset covers the state of Texas and includes on-systems routes (those that TxDOT maintains), such as interstate highways, U.S. highways, state highways, and farm and ranch roads, as well as off-system routes, such as county roads and local streets. Route segments in this unsegmented version are not broken by functional classification the way the other version of TxDOT Roadways feature layer is. This data contains measures. Measures are stored as M-values within each vertex along the line, in the same way that some datasets store z-values for the elevation, except that measures store the distance from the origin, or DFO, along the line. M-enabled networks serve as frameworks for locating roadway assets along the network using linear referencing. This data set must be downloaded as a file geodatabase in order keep M-values intact. If downloaded as a shapefile or added to a map from a connection to ArcGIS online, measures will not be applied to the line.Update Frequency: 1 MonthsSource: Geospatial Roadway Inventory Database (GRID)Security Level: PublicOwned by TxDOT: TrueRelated LinksData Dictionary PDF [Generated 2025/05/21]

The Trunk System is a network of rural divided highways that complements and includes elements of the Interstate Highway System. The minimal design criteria for this network specify that each highway should be at least a four-lane divided facility. That includes routes which are not yet made of four lanes, but ideally will be. The Trunk System will serve as a principal connector for all Texas cities with over 20,000 population as well as major ports and points of entry. The total mileage of the Trunk System, as stated in TxDOT Minute Order 910209, is limited to 11,500 miles. Update Frequency: 1 YearsSource: Geospatial Roadway Inventory Database (GRID)Security Level: PublicOwned by TxDOT: FalseRelated LinksData Dictionary PDF [Generated 2025/03/26]

The National Highway System (NHS) consists of roadways important to the nation's economy, defense, and mobility (Interstates, Other Principal Arterials, Strategic Highway Network, Major Strategic Highway Network Connectors, and Intermodal Connectors).This statewide NHS dataset is maintained by the Transportation Planning and Programming Division per Federal Highway Administration requirements, and to serve as a base layer for TxDOT's cartographic products.Update Frequency: 1 YearsSource: Geospatial Roadway Inventory Database (GRID)Security Level: PublicOwned by TxDOT: TrueRelated LinksData Dictionary PDF [Generated 2025/04/24]