This dataset has been altered from the WBD source in the following way: 12-digit HUCs that intersect a park boundary have been extracted for use. All other HUCs have been disregarded. The dataset structure extends the NPS core data standard recommendation and is current as of September 2020. This dataset is un-projected and has a geographic coordinate system spatial reference of NAD83(2011) (SRID/WKID 6318). For geoprocessing and analysis requiring a projected spatial reference, please download and re-project the AOAs dataset. For geoprocessing information about the creation of this AOA dataset, see the Data Release Report for more.