Inland Electronic Navigational Charts eng; USA 8-bit variable size UCS Transfer Format, based on ISO/IEC 10646 information applies to the series Dale Dodson United States Army Corp of Engineers (USACE) Geographer 703-428-3682 7701 Telegraph Road Alexandria VA 22315 United States Dale.K.Dodson@usace.army.mil party who can be contacted for acquiring knowledge about or acquisition of the resource 2026-02-02 ISO 19139 Geographic Information - Metadata ISO/TS 19139:2007 3857 EPSG Inland Electronic Navigational Charts 2020-07-01 date identifies when the resource was brought into existence 2026-01-21 date identifies when the resource was examined or re-examined and imporved or amended United States Army Corp of Engineers (USACE) party who created the resource The Inland Electronic Navigational Charts (IENC) dataset is updated bi-monthly by the US Army Corps (USACE)/Army Geospatial Center (AGC), and part of U.S. Department of Transportation (USDOT)/Bureau of Transportation Statistics (BTS) National Transportation Atlas Database (NTAD). There is a partial delivery on the 1st and 15th business day of a month. If there is a need for a special chart delivery, occasionally there will be updates outside of the delivery cycle. The charts with data changes are released either as new editions or updates to existing IENCs on a regular delivery cycle. These IENCs were developed from available data used in maintenance of Navigation channels. These vector data, that make up the charts, can be downloaded as a geodatabase here: https://ienccloud.us/ienc/products/files/U37/ienc_master_dataset_gdb/USACE_IENC_Master_Service_gdb.zip. In addition, web mapping services of the feature classes/datasets can be found here: https://ienccloud.us/arcgis/rest/services/IENC_Feature_Classes. Users of these IENCs should be aware that some features and attribute information could have significant inaccuracies due to changing waterway conditions, inaccurate source data, or approximations introduced during chart compilation. Caution is urged in use of these IENCs or derived products for navigation planning or operation, or any decisions pertaining to or affecting safety of vessel operation. Only charts downloaded from the USACE chart server, https://ienccloud.us, and used in an Electronic Chart Display Information System (ECDIS) or Electronic Chart System (ECS), or official government chart books are suitable for navigation. The U.S. inland navigation system consists of 7,260 miles of rivers maintained by the Corps of Engineers in 22 states, and includes 276 lock chambers with a total lift of 6,100 feet. The highly adaptable and effective system of barge navigation moves over 625 million tons of commodities annually, which includes coal, petroleum products, various other raw materials, food and farm products, chemicals, and manufactured goods. The shallow draft waterways have many unique characteristics and difficulties over coastal harbor and ocean navigation; river levels can change by over 30 feet in a seasonal cycle, the navigation channel can shift significantly within the river banks, and shifting yet ever present river currents pose constant challenges in these confined waterways. Electronic chart systems can offer significant benefits to vessels including accurate and real-time display of vessel position relative to waterway features, voyage planning and monitoring, training tools for new personnel and integrated display of river charts, radar, and Automatic Identification Systems. Following recommendations by the National Transportation Safety Board, the National Academy of Science and the American Waterways Operators, Congress directed the Corps of Engineers to develop and publish electronic charts for the inland waterways. Development of Inland Electronic Navigational Charts (IENCs) to cover the Mississippi River and tributaries thus began in 2001 with pilot projects on the Atchafalaya River in Louisiana and Lower Mississippi River near Vicksburg, Mississippi. These projects, which involved a combination of in-house and contract activities, were the first efforts to collect and convert inland waterway data, commonly used for river and channel maintenance, into the international S-57 hydrographic data exchange. This highly structured data format is commonly used for electronic chart applications and will be used for Corps IENCs An S-57 database is extracted into an Esri File Geodatabase for publication. This is that geodatabase and it contains 99 feature classes that make up the IENC data. Acknowledgment of the US Army Corps (USACE), Army Geospatial Center (AGC), and the Bureau of Transportation Statistics (BTS) [distributor]. data is continually being updated Dale Dodson United States Army Corp of Engineers (USACE) Geographer 703-428-3682 7701 Telegraph Road Alexandria VA 22315 United States Dale.K.Dodson@usace.army.mil party who can be contacted for acquiring knowledge about or acquisition of the resource Updates occur on the 1st and 15th business day of each month. NTAD National Transportation Atlas Database National Transportation Atlas Database vector Inland Electronic Navigational Charts Marine Maritime IENC US Inland ENC S Inland ENC 2.3.6 Electronic Navigational Charts S-57 Coast Guard Transportation Infrastructure AGC Army Geospatial Center USACE USCG HIFLD keyword identifies a particular subject or topic none NGDA National Geospatial Data Asset Transportation Theme NGDAID150 keyword identifies a particular subject or topic NGDA Portfolio Themes USA National Continental United States keyword identifies a location none Users should be aware that the IENCs reflect best available information at the time the data was collected. These data products are subject to change. limitation not listed Access Constraints: unrestricted National Transportation Atlas Database 2026-01-21 publication Bureau of Transportation Statistics (BTS) party who published the resource reference to a master dataset of which this one is a part eng; USA inlandWaters Native Dataset Environment: Version 6.2 (Build 9200) ; Esri ArcGIS 10.8.1.14362 -180 180 -90 90 2026-01-21 0 Inland Electronic Navigational Charts A data dictionary resource of attribute information is accessible at https://doi.org/10.21949/km8f-z019 Open Data Catalog 1.0 ArcGIS REST Services Directory Map Server (WMS) 10.81 Bureau of Transportation Statistics (BTS) NTAD Program Manager 1200 New Jersey Ave. SE Washington DC 20590 United States ntad@dot.gov party who distributes the resource None. No fees are applicable for obtaining the dataset. https://doi.org/10.21949/1522133 http Open Data Catalog Web page to view and download dataset. The file download formats available include: ESRI File Geodatabase or Shapefile, GeoPackage, Comma-Seperated Values (CSV), Microsoft Excel, GeoJSON, KML, Feature Collection, and SQLite Geodatabase. online instructions for transferring data from one storage device or system to another https://doi.org/10.21949/1528017 http ArcGIS REST Services Directory Map Server (WMS) complies with OGC WMS Map Service for visualizing geospatial information online instructions for transferring data from one storage device or system to another information applies to the series Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. USACE IENC data are created from the Inland ENC Harmonization Group (IEHG) Inland ENC 2.4, which is based on International Hydrographic Office (IHO) standard S-57. This is the native vector data format for ECDIS (Electronic Display Systems) and ECS (Electronic Chart Systems) on waterborne commercial vessels to view Inland Electronic Navigational Charts (IENC). The data are created in this format from CARIS and 7Cs chart creation software. The data are then converted with Safe Soft FME Workbench software to ESRI formatted File Geodatabases (GDB) within the ArcGIS software environment. All instances of Inland ENC feature classes, attribute fields and attribute enumerations have been mapped to real world naming conventions within Safe Soft FME Workbench for better customer understanding. data is updated as deemed necessary Dale Dodson United States Army Corp of Engineers (USACE) Geographer 703-428-3682 7701 Telegraph Road Alexandria VA 22315 United States Dale.K.Dodson@usace.army.mil party that accepts accountability and responsability for the data and ensures appropriate care and maintenance of the resource