The NHD is maintained by a network of partners that include Federal, State, and local government, and sometimes private industry therefore NHD Metadata and dataset credits may vary from location to location based upon the organization responsible for contribution. Additionally, individual features may be updated in order to accurately represent ground conditions, to improve accuracy, or as resolution improves. Because of this, it is important to collect metadata at the feature level so that users may see the feature update history, the organization responsible for making the update, and the date that update was made.