National Hydrography Dataset
National Hydrography Dataset (NHD) is the surface water component of The National Map. The NHD is a digital vector dataset used by geographic information systems (GIS).
It contains features such as lakes, ponds, streams, rivers, canals, dams and streamgages.
Map is scaled - NHD medium resolution draws to 1:250000 then Major NHD high resolution to 1:100000 and Minor NHD high resolution 1:100000 and below.
This map contains the following layers: