Description: The National Hydrography Dataset (NHD) is a feature-based database that interconnects and uniquely identifies the stream segments or reaches that make up the nation's surface water drainage system. NHD data was originally developed at 1:100,000-scale and exists at that scale for the whole country. This high-resolution NHD, generally developed at 1:24,000/1:12,000 scale, adds detail to the original 1:100,000-scale NHD. (Data for Alaska, Puerto Rico and the Virgin Islands was developed at high-resolution, not 1:100,000 scale.) Local resolution NHD is being developed where partners and data exist. The NHD contains reach codes for networked features, flow direction, names, and centerline representations for areal water bodies. The NHD also incorporates the National Spatial Data Infrastructure framework criteria established by the Federal Geographic Data Committee.This dataset is NHD Model version 2.3.1. See Model Diagram at: https://ftpgeoinfo.msl.mt.gov/Data/Spatial/MSDI/Hydrography/
Copyright Text: USGS, Montana State Library, and other contributors and base sources. See dataset feature-level metadata (tables: NHD Metadata, NHD Source Citation, and NHDFeatureToMetadata via key Meta_ProcessID; feature class to NHDFeatureMetadata via key Permenant_Identifier)