The North Carolina Center for Geographic Information and Analysis, in cooperation with the North Carolina Division of Water Quality, developed this digital hydrography dataset with Use Support information and water quality classifications to enhance planning, siting and impact analysis. This file enable users to identify surface water features which have special restrictions for building and development based on the locations of the features and their water quality classifications. Surface waters consist of streams, rivers, lakes, ponds, reservoirs, and shorelines. This file also enables users to determine whether a particular surface water is meeting its intended water quality uses. The linework is based on the USGS 1:24,000-scale Digital Line Graphs but has had additions from other sources as needed to include the hydrographic features in the stream classification codes. The data are updated as changes occur.
This dataset was created to provide a large and diverse group of users a data resource of North Carolina surface waters to enhance planning for sustainable growth and assist governmental agencies in making resource management decisions through use of a Geographic Information System (GIS).
Post DLG and data refinements include: a) Translation of DLG to ARC/INFO data format b) Review and correction for incompleteness and/or incorrect DLG attributes c) Internal and external (in-progress) coordinate edgematching of features along map edges d) Addition of hydrographic features as required by DWQ for stream classifications e) Addition of hydrographic attributes as identified in attribute table specifications Use support for the basin will be updated on a 5-year schedule concurrent with the North Carolina Division of Water Quality basinwide planning schedule. Stream classification information will be updated as changes occur.
Digital data release and revision dates
Acknowledgement of products derived from this data set should cite the following: The source of the Hydrography (1:24,000) with use support data set is the NC OneMap Database. Earlier versions of this dataset may exist. The user must be sure to use the appropriate data set for the time period and river basin of interest. While efforts have been made to ensure that these data are accurate and reliable within the state of the art, CGIA cannot assume liability for any damages or misrepresentation caused by any inaccuracies in the data or as a result of changes to the data caused by system transfers.
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All attribute codes have been reviewed for accuracy by the associated agency. NCDENR, Division of Water Quality is responsible for stream classifications and use support. The NC Center for Geographic Information and Analysis is responsible for linework and DLG codes.
Software checks for topology. There are no duplicate features, but coincident lines are maintained between data layers where appropriate. Polygonal features begin and end at the same point, contain no overshoots or undershoots. Linear features are continuous where appropriate, i.e., dangling arcs are removed if they are not required.
These data represent the locations and identities of surface shorelines, waters consisting of streams and rivers, lakes, ponds, and as depicted on USGS 1:24,000-scale digital line graphs and supplemented to reflect hydrographic features classified by the state but not represented on the original DLG linework. Each stream reach is labeled with stream classification and use support information.
Hydrography 1:24,000-scale features were taken from the USGS 1:24,000-scale DLGs. Supplemented hydrographic features were digitized from 1:100,000-scale bases and the linework checked against the bases to within a linewidth.
Basis for linework
Reference for attribute coding of use support and stream classification information
water quality assessment database and BIMS stream classification schedules
The statewide 1:24,000 hydrography tiles were edgematched and mapjoined. The neatlines and extraneous labels points were removed. The coverages were clipped to the North Carolina river basin boundaries derived from the HUNCRB data layer. Each river basin was edited such that index numbers matched their corresponding stream reach. Attributes were re-named and edited in cooperation with the Division of Water quality. CGIA and DWQ updates the digital files as needed.
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Water quality for specific stream reaches were assessed by DWQ and a use support ratings assigned. This rating identifies how well a stream reach meets its designated uses. Ratings and additional attributes are maintained in an ACCESS database and updated by river basin on a 5-year rotation. The Division of Water Quality joins these data to the 24k hydrography data layer. DWQ provides CGIA with updates as they occur either from a new assessment, reclassification or correction.
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Internal feature number.
ESRI
Feature geometry.
ESRI
Length of feature in internal units.
ESRI
DLG standard code for feature
US Geological Survey
DLG standard code for feature
US Geological Survey
DLG standard code for feature
US Geological Survey
DLG standard code for feature
US Geological Survey
DLG standard code for feature
US Geological Survey
DLG standard code for feature
US Geological Survey
Assessment Unit number (ex: 9-53-1a) for stream reaches based on data collection. AUNUmbers are a subset of DWQIndex numbers with a letter on the end.
NC DENR-Div of Water Quality, Planning Section
Stream name as listed in DWQ Classification schedules and BIMS (Basinwide Information Management System)
NC DENR-Div of Water Quality, Planning Section
Description of Assessment Unit
NC DENR-Div of Water Quality, Planning Section
Length or area of Assessment Unit in miles or acres
NC DENR-Div of Water Quality, Planning Section (software computed)
waterbody type and units
NC DENR-Div of Water Quality, Planning Section
freshwater acres associated with lakes, ponds, and reservoirs
NC DENR-Div of Water Quality, Planning Section
freshwater miles associated with streams and rivers
NC DENR-Div of Water Quality, Planning Section
Acres associated with estuarine waters
NC DENR-Div of Water Quality, Planning Section
miles associated with tidal creeks represented by a single line only
NC DENR-Div of Water Quality, Planning Section
miles of Atlantic Ocean coastline
NC DENR-Div of Water Quality, Planning Section
Date of last use support update
NC DENR-Div of Water Quality, Planning Section
Aquatic life categorty use support rating -- whether aquatic life (benthic macroinvertibrates and fish) can live and reproduce in the waters of the state. This category is applied to all waters of the state except those not indexed or unnamed.
NC DENR-Div of Water Quality, Planning Section
aquatic life is supported (FS or S)
NC DENR-Div of Water Quality, Planning Section
aquatic life is supported (FS or S)
NC DENR-Div of Water Quality, Planning Section
aquatic life is impaired (PS, NS or I)
NC DENR-Div of Water Quality, Planning Section
aquatic life is impaired (PS, NS or I)
NC DENR-Div of Water Quality, Planning Section
aquatic life is impaired (PS, NS or I)
NC DENR-Div of Water Quality, Planning Section
inconclusive data to make assessment for aquatic life use
NC DENR-Div of Water Quality, Planning Section
no data are available to make assessment for aquatic life use
NC DENR-Div of Water Quality, Planning Section
Rating basis (monitored or evaluated) for all rated streams except ND (no data) streams
NC DENR-Div of Water Quality, Planning Section
monitored
NC DENR-Div of Water Quality, Planning Section
evaluated
NC DENR-Div of Water Quality, Planning Section
Recreation categorty use support rating -- whether waters of the state meet recreation standards for pathogen indicators. This category is applied to all waters of the state except those not indexed or unnamed.
NC DENR-Div of Water Quality, Planning Section
recreation criteria not exceeded (FS or S)
NC DENR-Div of Water Quality, Planning Section
recreation criteria not exceeded (FS or S)
NC DENR-Div of Water Quality, Planning Section
recreation criteria exceeded, water impaired (PS, NS or I)
NC DENR-Div of Water Quality, Planning Section
recreation criteria exceeded, water impaired (PS, NS or I)
NC DENR-Div of Water Quality, Planning Section
recreation criteria exceeded, water impaired (PS, NS or I)
NC DENR-Div of Water Quality, Planning Section
inconclusive data to make assessment for recreation use
NC DENR-Div of Water Quality, Planning Section
no data are available to make assessment for recreation use
NC DENR-Div of Water Quality, Planning Section
Rating basis (monitored or evaluated) for all rated streams except ND (no data) streams
NC DENR-Div of Water Quality, Planning Section
monitored
NC DENR-Div of Water Quality, Planning Section
evaluated
NC DENR-Div of Water Quality, Planning Section
Fish consumption use support is a human health approach to assess whether humans can safely consume fish from a water. This category is applied to all waters of the state except those not indexed or unnamed.
NC DENR-Div of Water Quality, Planning Section
no advice or advisory indicated for segment (FS or S)
NC DENR-Div of Water Quality, Planning Section
no advice or advisory indicated for segment (FS or S)
NC DENR-Div of Water Quality, Planning Section
advice or advisory indicated for segment - impaired (PS, NS or I)
NC DENR-Div of Water Quality, Planning Section
advice or advisory indicated for segment - impaired (PS, NS or I)
NC DENR-Div of Water Quality, Planning Section
advice or advisory indicated for segment - impaired (PS, NS or I)
NC DENR-Div of Water Quality, Planning Section
inconclusive data to make assessment for fish consumption use
NC DENR-Div of Water Quality, Planning Section
no data are available to make assessment for fish consumption use
NC DENR-Div of Water Quality, Planning Section
Rating basis (monitored or evaluated) for all rated streams except ND (no data) stream
NC DENR-Div of Water Quality, Planning Section
monitored
NC DENR-Div of Water Quality, Planning Section
evaluated
NC DENR-Div of Water Quality, Planning Section
Shellfish harvesting use support is a human health approach to assess whether shellfish can be commercially harvested and therefore is applied only to Class SA waters.
NC DENR-Div of Water Quality, Planning Section
water is approved for shellfish harvesting (FS or S)
NC DENR-Div of Water Quality, Planning Section
water is approved for shellfish harvesting (FS or S)
NC DENR-Div of Water Quality, Planning Section
water is not approved for shellfish harvesting - impaired (PS, NS or I)
NC DENR-Div of Water Quality, Planning Section
water is not approved for shellfish harvesting - impaired (PS, NS or I)
NC DENR-Div of Water Quality, Planning Section
water is not approved for shellfish harvesting - impaired (PS, NS or I)
NC DENR-Div of Water Quality, Planning Section
Rating basis (monitored or evaluated) for all rated streams
NC DENR-Div of Water Quality, Planning Section
monitored
NC DENR-Div of Water Quality, Planning Section
evaluated
NC DENR-Div of Water Quality, Planning Section
Water Supply use support is a human health approach to assess whether a water can be used for water supply purposes. This category is applied to Class WS waters.
NC DENR-Div of Water Quality, Planning Section
water supplier able to supply potable water (FS or S)
NC DENR-Div of Water Quality, Planning Section
water supplier able to supply potable water (FS or S)
NC DENR-Div of Water Quality, Planning Section
Rating basis (monitored or evaluated) for all rated streams except ND (no data) stream
NC DENR-Div of Water Quality, Planning Section
monitored
NC DENR-Div of Water Quality, Planning Section
evaluated
NC DENR-Div of Water Quality, Planning Section
DWQ stream classification index number (ex: 9-53-1)
NC DENR-Div of Water Quality, Planning Section
Stream name as listed in DWQ Classification schedules and BIMs
NC DENR-Div of Water Quality, Planning Section
Description of Indexed segment
NC DENR-Div. Of Water Quality, Planning Section
DWQ stream classification (ex: WS-III)
NC DENR-Div of Water Quality, Water Quality Section
Waters protected as water supplies which are in natural and undeveloped watersheds
NC DENR-Div of Water Quality, Planning Section
Waters protected as water supplies which are generally in predominantly undeveloped watersheds
NC DENR-Div of Water Quality, Planning Section
Waters protected as water supplies which are generally in low to moderately developed watersheds
NC DENR-Div of Water Quality, Planning Section
Waters protected as water supplies which are generally in moderately to highly developed watersheds
NC DENR-Div of Water Quality, Planning Section
Waters protected as water supplies which are generally upstream and draining to Class WS-IV waters
NC DENR-Div of Water Quality, Planning Section
Primary recreation and any other usage specified by the "C" classification
NC DENR-Div of Water Quality, Planning Section
Aquatic life propagation and survival, fishing, wildlife, secondary recreation, and agriculture
NC DENR-Div of Water Quality, Planning Section
Shellfishing for market purposes and any other usage specified by the "SB" and "SC" classification
NC DENR-Div of Water Quality, Planning Section
Primary recreation and any other usage specified by the "SC" classification
NC DENR-Div of Water Quality, Planning Section
Aquatic life propagation and survival, fishing, wildlife, and secondary recreation
NC DENR-Div of Water Quality, Planning Section
Suitable for natural trout propagation and maintenance of stocked trout
NC DENR-Div of Water Quality, Planning Section
Waters which have low velocities and other natural characteristics which are different from adjacent streams
NC DENR-Div of Water Quality, Planning Section
High Quality Waters which are waters that are rated as excellent based on biological and physical/chemical characteristics through division monitoring or special studies; native and special native trout waters (and their tributaries) designated by the Wildlife Resources Commission; primary nursery areas (PNA) designated by the Marine Fisheries Commission and other functional nursery areas designated by the Wildlife Resources Commission; critical habitat areas designated by the Wildlife Resources Commission or the Department of Agriculture; all water supply watersheds which are either classified as WS-I or WS-II or those for which a formal petition for reclassification as WS-I or WS-II has been received from the appropriate local government and accepted by the Division of Water Quality; and all Class SA waters.
NC DENR-Div of Water Quality, Planning Section
Nutrient Sensitive Waters which require limitations on nutrient inputs
NC DENR-Div of Water Quality, Planning Section
Date of last feature classification update
NC DENR-Div of Water Quality, Planning Section
River Basin where feature is located
NC DENR-Div of Water Quality, Planning Section
Date of last modification of DWQ attributes
NC DENR-Div of Water Quality, Planning Section
An arc shapefile depicting surface waters consisting of streams and rivers, lakes, ponds, reservoirs, and shorelines.
Refer to source agency for published stream classification documents and use support methodolgy.
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Contact by phone and email preferred
NCCGIA is charged with the development and maintenance of the Nc OneMap database and, in cooperation with other mapping organizations, is committed to offering its users accurate, useful, and current information about the state. Although every effort has been made to ensure the accuracy of information, errors and conditions originating from physical sources used to develop the NC OneMap Database may be reflected in the data supplied. The client must be aware of data conditions and bear responsibility for the appropriate use of the information with respect to possible errors, original map scale, collection methodology, currency of data, and other conditions specific to certain data. NCCGIA does not support secondary distribution of this dataset. The use of trade names or commercial products does not constitute their endorsement by the NCCGIA or North Carolina State Government.
Data can be customized on a cost-recovery basis. Contact dataq@ncmail.net or 919-733-2090 for more information.
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