: This site provides direct links to pre-staged datasets by state or by the entire nation (updated monthly). Understanding the Data Formats
The is the definitive source for surface water data in the United States. If you are looking for an NHD flowline download , you are likely seeking the vector line features that represent the nation's drainage network, including streams, rivers, canals, and pipelines. Where to Download NHD Flowline Data nhd flowline download
There are several official platforms for accessing NHD flowline data, depending on the resolution and extent you need: : This site provides direct links to pre-staged