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.
Purpose
Subset of the NHD containing the appended features for the Hydrologic Unit Codes 18010211, 18010212, 18020003, 18020004, 18020005, 18020101, 18020102, 18020113 18020118. These were merged at Shasta County from NHD source data then projected to the County's standard projection (UTM Zone 10, NAD83). All other metadata here is from NHD. ::: 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.
Temporal Extent
Currentness Reference
ground condition
Time Period
Begin
End
2014-10-13T00:00:00
Bounding Box
West
-123.706571
East
-120.798348
North
41.601775
South
40.021445
ISO Topic Category
environment
geoscientificInformation
inlandWaters
Place Keyword
Shasta County (Calif.)
Place Keyword Thesaurus
geonames
Theme Keyword
Hydrology
Theme Keyword Thesaurus
lcsh
Resource Constraints
Use Limitation
None. Acknowledgment of the originating agencies would be appreciated in products derived from these data.
Status
completed
Maintenance and Update Frequency
unknown
Language
eng
Credit
See dataset specific metadata.
Point of Contact
Contact
Marcus Harner
Position Name
IT/GIS Analyst
Email
mharner@co.shasta.ca.us
Spatial Reference Information
Reference System Identifier
Code
26910
Code Space
EPSG
Version
7.8.2(3.0.1)
Data Quality Information
Lineage
Statement
Date of 2014 assigned based on date downloaded from Shasta County website.
Process Step
Description
Changed file name from "NHDWaterbody.shp" to "Shasta_waterbodies_2014.shp".
Process Date
2016-03-28T00:00:00
Distribution Information
Format Name
Shapefile
Format Version
ArcGIS 10.2
Distributor
UC Berkeley Library
Online Access
Protocol
Name
Spatial Representation Information
Vector
Topology Level
geometryOnly
Vector Object Type
composite
Vector Object Count
5002
Metadata Reference Information
Hierarchy Level
dataset
Metadata File Identifier
28722/bk0016x6d5w
Dataset URI
28722/bk0016x6d5w
Metadata Date Stamp
2018-02-27
Metadata Standard Name
ISO 19139 Geographic Information - Metadata - Implementation Specification
