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Depth Areas USACE IENC

2025 - Homeland Infrastructure Foundation Level Data HIFLD


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ABSTRACT
A depth area is a water area whose depth is within a defined range of values. Intertidal areas are encoded as depth areas. These do not have to include soundings. The depth range within a depth area is defined by the attributes 'DRVAL1' and 'DRVAL2'. Distinction: depth contour; dredged area; sounding; obstruction; sea area/named water area; unsurveyed area; wreck The USACE IENCs coverage area consists of 7,260 miles across 21 rivers primarily located in the Central United States. IENCs apply to inland waterways that are maintained for navigation by USACE for shallow-draft vessels (e.g., maintained at a depth of 9-14 feet, dependent upon the waterway project authorization). Generally, IENCs are produced for those commercially navigable waterways which the National Oceanic and Atmospheric Administration (NOAA) does not produce Electronic Navigational Charts (ENCs). However, Special Purpose IENCs may be produced in agreement with NOAA.