National Hydrography Dataset (NHD) Lines


NHD Lines represent linear NHD hydrographic landmark features used for cartographic representation.


The NHD was created to assist scientists in modeling hydrologic features and is also useful for cartographic mapping purposes. The geometric features that came from the USGS DLG files, combined with the flow direction, reach codes, and other attributes taken from the EPA RF3 file, make the NHD a powerful modeling tool.

Time Period of Content

  • Beginning date: 1990s
  • Ending date: 2016

Publish Date



USGS, Florida Water Management Districts, Florida Department of Environmental Protection


Florida Department of Environmental Protection

Theme Keywords

hydrography, water, lakes, streams, rivers, estuaries

Place Keywords


Source Scale


Horizontal Accuracy

Estimated to meet 1:24,000 National Map Accuracy Standards (+/- 40 feet)

Vertical Accuracy

If the source for elevation is 7.5 minute topo map, estimated to be one half of a contour, or +/- 2.5 feet.

Process Steps


ESRI File Geodatabase

Format Details


Albers Florida HARN

Field Names

permanent_identifier = Unique ID

fdate = Date of last feature modification.

resolution = Source resolution. All values = 2

Code   Description1   Description2
1 Local >1:12,000
2 High 1:24,000/12,000
3 Medium 1:100,000

gnis_id = USGS Geographic Names Information System (GNIS) ID

gnis_name = USGS Geographic Names Information System (GNIS) Name


ftype = 3-digit feature code. (Integer)

Code   Description
343   Dam/Weir
369   Gate
398   Lock Chamber
411   Nonearthen Share
434   Reef
483   Wall
487   Waterfall
503   Sounding Datum Line

fcode = 5-digit feature code. Extra two digits provide a more detailed description of the feature. (Integer)

Distribution Info