NHD
20150901
RiversStreams
vector digital data
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. Reaches are also defined on waterbodies and the approximate shorelines of the Great Lakes, the Atlantic and Pacific Oceans and the Gulf of Mexico. The NHD also incorporates the National Spatial Data Infrastructure framework criteria established by the Federal Geographic Data Committee.
The NHD is a national framework for assigning reach addresses to water-related entities, such as industrial discharges, drinking water supplies, fish habitat areas, wild and scenic rivers. Reach addresses establish the locations of these entities relative to one another within the NHD surface water drainage network, much like addresses on streets. Once linked to the NHD by their reach addresses, the upstream/downstream relationships of these water-related entities--and any associated information about them--can be analyzed using software tools ranging from spreadsheets to geographic information systems (GIS). GIS can also be used to combine NHD-based network analysis with other data layers, such as soils, land use and population, to help understand and display their respective effects upon one another. Furthermore, because the NHD provides a nationally consistent framework for addressing and analysis, water-related information linked to reach addresses by one organization (national, state, local) can be shared with other organizations and easily integrated into many different types of applications to the benefit of all.
20150901
20160317
NHFG-assigned attributes to be updated when NHD features change.
As needed
-72.876050
-69.916355
45.416488
41.811246
None
FWHydrography
Hydrography
Stream / River
Lake / Pond
Canal / Ditch
Reservoir
Spring / Seep
Swamp / Marsh
Artificial Path
Reach Code
None
None. Acknowledgment of the originating agencies would be appreciated in products derived from these data.
See dataset specific metadata.
Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.2.2.3552
Vector
String
67979
NAD 1983 Albers
29.5
45.5
-96.0
23.0
0.0
0.0
coordinate pair
0.0001
0.0001
meter
D North American 1983
GRS 1980
6378137.0
298.257222101
RiversStreams
OBJECTID
Internal feature number.
ESRI
Sequential unique whole numbers that are automatically generated.
Shape
Feature geometry.
ESRI
Coordinates defining the features.
FDate
Feature date
NHD
Resolution
NHD
NHD
GNIS_ID
GNIS identifier
GNIS
GNIS_Name
Name of water body
GNIS
LengthKM
Length of reach in kilometers
calculated
ReachCode
Reach code
NHD
FlowDir
Flow direction
NHD
Permanent_Identifier
NHD
NHD
FType
Feature type
NHD
FCode
Feature code
NHD
Shape_Length
Length of feature in internal units.
ESRI
Positive real numbers that are automatically generated.
WBArea_Permanent_Identifier
NHD
NHD
Enabled
NHD
NHD
SOrder
Stream order
NH Department of Environmental Services
NHDESID
unique identifier
NH Department of Environmental Services
NHDESMODEL
Coldwater fisheries predictive model
NH Department of Environmental Services
NHTEMP
NH Fishery temperature class from NHDES model and species occurrence records
NH Fish and Game Department
TNCHIQUAL
1 = top ranked stream reach, 0 = not top-ranked
NH Fish and Game Department
TIDAL
Reach is tidal (Y or N)
NH Fish and Game Department
DESCRIP
Description
NHD
NOTES
Notes
NHD
The National Hydrography Dataset is a comprehensive set of digital spatial data that encodes information about naturally occurring and constructed bodies of water, paths through which water flows, and related entities. The information encoded about features includes a feature date, classification by type, other characteristics, a unique common identifier, the feature length or area, and (rarely) elevation of the surface of water pools and a description of the stage of the elevation. For reaches, encoded information includes a reach code. Names and their identifiers in the Geographic Names Information System, are assigned to most feature types. The direction of flow is encoded for networked features. The data also contains relations that encode metadata, and information that supports the exchange of future updates and improvements to the data. The names and definitions of all feature types, characteristics, and values are in the Standards for National Hydrography Dataset: Reston, Virginia, U.S. Geological Survey, 1999. The document is available online through http://mapping.usgs.gov/standards/.
The names and definitions of all feature types, characteristics, and values are in U.S. Geological Survey, 1999, Standards for National Hydrography Dataset High Resolution: Reston, Virginia, U.S. Geological Survey. The document is available online through http://mapping.usgs.gov/standards/. Information about tables and fields in the data are available from the user documentation for the National Hydrography Dataset at http://nhd.usgs.gov. The National Map - Hydrography Fact Sheet is also available at: http://erg.usgs.gov/isb/pubs/factsheets/fs06002.html.
See access and use constraints information.
Personal GeoDatabase Feature Class
20160317
NH Fish and Game Department
GIS Coordinator
mailing and physical
11 Hazen Dr
Concord
NH
03301
US
603-271-3014
catherine.callahan@nh.gov
FGDC Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998
local time