Homeland Infrastructure Foundation Level Data HIFLDAn area within which a uniform assessment of the quality of the data exists. Distinction: accuracy of data, survey reliability 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.FileengPennsylvania Spatial Data Access (PASDA)PublicData Quality Assessment Areas USACE IENC [Pennsylvania]DatasetsPennsylvania