@prefix dcat: . @prefix dct: . @prefix foaf: . @prefix vcard: . @prefix xsd: . a dcat:Dataset ; dct:description """The USGS National Hydrography Dataset (NHD) Downloadable Data Collection from The National Map (TNM) is a comprehensive set of digital spatial data that encodes information about naturally occurring and constructed bodies of surface water (lakes, ponds, and reservoirs), paths through which water flows (canals, ditches, streams, and rivers), and related entities such as point features (springs, wells, stream gages, and dams). The information encoded about these features includes classification and other characteristics, delineation, geographic name, position and related measures, a "reach code" through which other information can be related to the NHD, and the direction of water flow. The network of reach codes delineating water and transported material flow allows users to trace movement in upstream and downstream directions. In addition to this geographic information, the dataset contains metadata that supports the exchange of future updates and improvements to the data. The NHD supports many applications, such as making maps, geocoding observations, flow modeling, data maintenance, and stewardship. For additional information on NHD, go to https://www.usgs.gov/core-science-systems/ngp/national-hydrography.\r \r DWR is the steward for NHD and Watershed Boundary Dataset (WBD) in California. We work with other organizations to edit and improve NHD and WBD, using the business rules for California. California's NHD improvements are sent to USGS for incorporation into the national database. The most up-to-date products are accessible from the USGS website. \r \r For additional derivative products and resources, including the major features in geopackage format, please go to this page: https://data.cnra.ca.gov/dataset/nhd-major-features""" ; dct:identifier "7ed44dbb-6215-4bf4-8a93-018f4466a93e" ; dct:issued "2018-03-01T16:37:12.698675"^^xsd:dateTime ; dct:modified "2022-07-28T23:32:03.248107"^^xsd:dateTime ; dct:publisher ; dct:title "National Hydrography Dataset (NHD)" ; dcat:contactPoint [ a vcard:Organization ; vcard:fn "Jane Schafer-Kramer" ; vcard:hasEmail ] ; dcat:distribution , , , , , , , , , , , , , , , , , , , , , , ; dcat:keyword "amerigeo", "amerigeoss", "aqueduct", "arcgis", "california-department-of-water-resources", "canals", "ckan", "creek", "creeks", "flow-network", "flowlines", "geo", "geoss", "gis", "gis-data", "gis-layers", "gis-maps", "hydrography", "hydrology", "lakes", "major-lakes", "major-lakes-and-reservoirs", "major-river", "major-rivers", "major-rivers-and-creeks", "minor-rivers", "national", "national-hydrography-dataset", "nhd", "north-america", "pipeline", "ponds", "reservoirs", "river", "river-basin", "rivers", "streams", "united-states", "usgs", "waterbodies", "watershed", "watershed-boundary-dataset", "watersheds", "wbd" ; dcat:theme <%7B%22Natural%20Resources%22>, . a dcat:Distribution ; dct:description "Provides direct download links and web-based map service information for The National Map" ; dct:format "https" ; dct:issued "2022-08-08T12:47:35.688491"^^xsd:dateTime ; dct:modified "2025-11-19T16:36:09.813113"^^xsd:dateTime ; dct:title "The National Map - Service Endpoints" ; dcat:accessURL ; dcat:mediaType "application/octet-stream" . a dcat:Distribution ; dct:description "An ArcGIS Tiled Base Map Service for visualizing hydrographic features." ; dct:format "Esri REST" ; dct:issued "2022-08-08T12:47:35.688495"^^xsd:dateTime ; dct:modified "2025-11-19T16:36:09.813869"^^xsd:dateTime ; dct:title "National Hydrography Base Map Service (ArcGIS)" ; dcat:accessURL . a dcat:Distribution ; dct:description "DWR is the steward for NHD and Watershed Boundary Dataset (WBD ) in California. We work with other organizations to edit and improve NHD and WBD, using the business rules for California. Visit the California NHD Stewardship page at https://water.ca.gov/Programs/All-Programs/National-Hydrography-Dataset-Stewardship" ; dct:format "HTTPS" ; dct:issued "2022-08-08T12:47:35.688502"^^xsd:dateTime ; dct:modified "2025-11-19T16:36:09.815769"^^xsd:dateTime ; dct:title "California NHD Stewardship Website" ; dcat:accessURL ; dcat:mediaType "application/octet-stream" . a dcat:Distribution ; dct:description "This resource contains some cartographic products in shapefile and geopackage format along with join tables to describe the FType and FCode values found in the USGS' file geodatabase format." ; dct:issued "2022-08-08T12:47:35.688555"^^xsd:dateTime ; dct:modified "2025-11-19T16:36:09.827744"^^xsd:dateTime ; dct:title "NHD Major Features Derivative Products" ; dcat:accessURL . a dcat:Distribution ; dct:description "Issues include the latest dataset updates, tips & tricks, upcoming training and meetings, general announcements and more of the nation's surface water and hydrologic geospatial datasets: the National Hydrography Dataset, Watershed Boundary Dataset, and NHDPlus High Resolution. Engage with us and others in the Hydrography community by subscribing and share your best surface water photos!" ; dct:issued "2022-08-08T12:47:35.688510"^^xsd:dateTime ; dct:modified "2025-11-19T16:36:09.817886"^^xsd:dateTime ; dct:title "USGS National Hydrography Dataset Newsletter" ; dcat:accessURL . a dcat:Distribution ; dct:description "This is a spreadsheet used to record the datasets used for reference in the updating of the California portion of the NHD. The NHD Stewardship Program is constantly seeking new sources of local knowledge to help improve this data. To contribute to this effort, please contact the lead steward at nhd_stewardship@water.ca.gov" ; dct:format "CSV" ; dct:issued "2022-08-08T12:47:35.688540"^^xsd:dateTime ; dct:modified "2025-11-19T16:36:09.824716"^^xsd:dateTime ; dct:title "Reference Data Used in Updating the California NHD" ; dcat:accessURL ; dcat:mediaType "text/csv" . a dcat:Distribution ; dct:description """The Markup Application is a web-based mapping communication tool that allows users to suggest edits, or “markups”, to the NHD, WBD, and NHDPlus HR. Anyone can suggest corrections and improvements to the data. A Gmail, ArcGIS Online, or Microsoft Office account is needed to authenticate into the web application. The application has been designed to work in the Google Chrome Web Browser only.\r Suggested edits will be reviewed by the USGS and the NHD state stewards before they are approved for incorporation into the NHD or WBD datasets and future NHDPlus HR Refresh products. \r Markup App Help may be found at \r https://hydromaintenance.nationalmap.gov/MarkupWeb/WebHelp/MarkupUserGuide.htm#t=Markup_App%2FOverview%2FMarkup_Application_Introduction.htm""" ; dct:format "web" ; dct:issued "2022-08-08T12:47:35.688544"^^xsd:dateTime ; dct:modified "2025-11-19T16:36:09.825455"^^xsd:dateTime ; dct:title "Report Errors in the NHD and WBD with the Markup App" ; dcat:accessURL . a dcat:Distribution ; dct:description "On July 21, 2022, Jane Schafer-Kramer presented a webinar for California NHD users on changes coming to the NHD. These are the slides with notes" ; dct:format "PDF" ; dct:issued "2022-08-08T12:47:35.688562"^^xsd:dateTime ; dct:modified "2025-11-19T16:36:09.829231"^^xsd:dateTime ; dct:title "Slides from NHD of the Future presentation 7/21/2022" ; dcat:accessURL ; dcat:mediaType "application/pdf" . a dcat:Distribution ; dct:description "The NHDFlowline feature class of the NHD now has an attribute field name VisibilityFilter which allows for filtering of these vector data features at eight approximate scales.This is a convenient way to \"thin\" the density of the flowline features for cartography and for analysis. For more information and instructions on using this filter in Esri's ArcGIS, please visit the USGS website at the above link." ; dct:issued "2022-08-08T12:47:35.688536"^^xsd:dateTime ; dct:modified "2025-11-19T16:36:09.823975"^^xsd:dateTime ; dct:title "How to Use the NHD Visibility Filter in a GIS" ; dcat:accessURL . a dcat:Distribution ; dct:description """Major Rivers in California selected from the NHD in a zipped shapefile format. Resource last updated 7/11/2022.\r \r Services for this layer can be found at:\r \r https://gis.water.ca.gov/arcgis/rest/services/InlandWaters/NHD_Major_Rivers/FeatureServer\r \r https://gis.water.ca.gov/arcgis/rest/services/InlandWaters/NHD_Major_Rivers/MapServer\r \r Shapefiles include a .csv with the Ftype code descriptors. These descriptors can be joined to the shapefile via a join on the code field. \r \r \r Selecting Only Major Rivers in the NHD using ArcMap - from the USGS National Hydrography Dataset Newsletter, Vol. 13, No. 8, June 2014, by Jeff Simley, USGS \r \r **Please note that this data is only as complete as the NHD, and there are connectivity issues associated with this method of selection. We will continue to update this data as USGS releases new versions of the NHD.**\r \r The NHD contains a lot of information, but for some applications, particularly those at small scales, it needs to be generalized. One approach is to show only “major rivers” in the NHD. A quick technique to show only the named rivers can easily be done by selecting NHDFlowline GNIS_NAME > ‘0’. See: ftp://nhdftp.usgs.gov/Hydro_Images/BlueRiver_Named_Rivers.jpgTo be even more restrictive, major rivers can be defined as only “double-line” or polygonal rivers, which appear in NHDArea. This is more complicated, and takes a few minutes, but works well. This approach finds the Artifical Path of those polygonal rivers: \r \r 1. Find the polygonal rivers: Select by Attributes NHDArea where FType = 460 - Stream/River. \r \r 2. Now it is necessary to find the NHDFlowline Artificial Paths of those rivers. Artificial Paths are linked to the polygon they are inside of using the field WBArea_Permanent_Identier. Create the link by doing a relate between NHDFlowline (key WBArea_Permanent_Identifier) and NHDArea (key Permanent_Identifier) \r \r 3. Invoke the relationship and select the corresponding NHDFlowlines. \r \r 4. For clarity, turn off the NHDArea selected features (the polygonal rivers). \r \r 5. Now the candidate artificial paths are selected, but there are two problems: One is that the rivers running through lakes are not selected (which they should be), and two, the “stubs”of the tributary artificial paths have been selected (which are not wanted). \r \r 6. Next order of business is to eliminate the minor stubs with no name. Select from selection by Attributes NHDFlowline GNIS_Name > ‘0’. Now only stubs that are named remain. \r \r 7. Some of the remaining candidate artificial paths are wanted (the major rivers) and some are not (the named stubs). The named stubs can be eliminated by virtue of the fact that there are very few of them (normally one record per name) and those with low counts can be eliminated. \r \r 8. Open the NHDFlowline attribute table. Some records are selected (the remaining candidate list) and some are not (all other flowlines making up “minor rivers”). Summarize the number of records under the field GNIS_Name and write this out as Sum_Output.dbf which you then add to ArcMap. \r \r 9. Now the goal is to find the names of the major rivers. These will be rivers with a record count greater than 1. The extraneous non-named stubs have already been eliminated, which helps reduce the load. The next steps will select only records with significant counts, that is, the major rivers. This will allow deselecting the remaining NHDFlowlines and in the process eliminate the named stubs. \r \r 10. It is necessary to relate Sum_Output (key GNIS_Name) with NHDFlowline (key GNIS_Name) to make it possible to use the GNIS_NAME’s to select the major rivers in NHDFlowline. \r \r 1. Open the Sum_Output table. Note the field Count_GNIS_Name which will be used to count records. This will eliminate named stubs, leaving just the major rivers selected. Create a New Selection, Cnt_GNIS_N > 1. Leave the table open. Note major rivers are selected.Invoke the relationship to select the major rivers. In ArcMap all “major rivers” have been selected, even rivers through lakes. \r \r 12. Select only those features with "River" in the GNIS Name.\r \r Note: This workout omits the American River. It has been manually added to this dataset.""" ; dct:format "ZIP" ; dct:issued "2022-08-08T12:47:35.688529"^^xsd:dateTime ; dct:modified "2025-11-19T16:36:09.822483"^^xsd:dateTime ; dct:title "NHD Major Rivers" ; dcat:accessURL ; dcat:mediaType "application/zip" . a dcat:Distribution ; dct:format "https" ; dct:issued "2022-08-08T12:47:35.688507"^^xsd:dateTime ; dct:modified "2025-11-19T16:36:09.816832"^^xsd:dateTime ; dct:title "USGS NHD Website" ; dcat:accessURL ; dcat:mediaType "application/octet-stream" . a dcat:Distribution ; dct:format "https" ; dct:issued "2022-08-08T12:47:35.688483"^^xsd:dateTime ; dct:modified "2025-11-19T16:36:09.810868"^^xsd:dateTime ; dct:title "The National Map - Download Viewer" ; dcat:accessURL ; dcat:mediaType "application/octet-stream" . a dcat:Distribution ; dct:description "The National Hydrography Dataset (NHD) is the authoritative surface water component of California's spatial data infrastructure. Reports on the progress of the NHD Stewardship Program are posted four times each year on the California GIS Council's website. Questions or comments may be directed to the lead steward: Jane.Schafer-Kramer@water.ca.gov." ; dct:issued "2022-08-08T12:47:35.688518"^^xsd:dateTime ; dct:modified "2025-11-19T16:36:09.820006"^^xsd:dateTime ; dct:title "NHD Stewardship Reports to the California GIS Council" ; dcat:accessURL . a dcat:Distribution ; dct:description """Major Rivers and Creeks in California selected from the NHD in a zipped shapefile format. Resource last updated 7/11/2022.\r \r Services for this layer can be found at: \r \r https://gis.water.ca.gov/arcgis/rest/services/InlandWaters/NHD_Major_Rivers_and_Creeks/FeatureServer\\\r \r https://gis.water.ca.gov/arcgis/rest/services/InlandWaters/NHD_Major_Rivers_and_Creeks/MapServer\r \r Shapefile includes a .csv file with the Ftype descriptors, these can be added via a join on the Ftype code. \r \r Selecting Only Major Rivers and Creeks in the NHD using ArcMap - from the USGS National Hydrography Dataset Newsletter, Vol. 13, No. 8, June 2014, by Jeff Simley, USGS\r \r **Please note that this data is only as complete as the NHD, and there are connectivity issues associated with this method of selection. We will continue to update this data as USGS releases new versions of the NHD.**\r \r The NHD contains a lot of information, but for some applications, particularly those at small scales, it needs to be generalized. One approach is to show only “major rivers” in the NHD. A quick technique to show only the named rivers can easily be done by selecting NHDFlowline GNIS_NAME > ‘0’. See: ftp://nhdftp.usgs.gov/Hydro_Images/BlueRiver_Named_Rivers.jpgTo be even more restrictive, major rivers can be defined as only “double-line” or polygonal rivers, which appear in NHDArea. This is more complicated, and takes a few minutes, but works well. This approach finds the Artifical Path of those polygonal rivers:\r \r 1. Find the polygonal rivers: Select by Attributes NHDArea where FType = 460 - Stream/River.\r \r 2. Now it is necessary to find the NHDFlowline Artificial Paths of those rivers. Artificial Paths are linked to the polygon they are inside of using the field WBArea_Permanent_Identier. Create the link by doing a relate between NHDFlowline (key WBArea_Permanent_Identifier) and NHDArea (key Permanent_Identifier)\r \r 3. Invoke the relationship and select the corresponding NHDFlowlines.\r \r 4. For clarity, turn off the NHDArea selected features (the polygonal rivers).\r \r 5. Now the candidate artificial paths are selected, but there are two problems: One is that the rivers running through lakes are not selected (which they should be), and two, the “stubs”of the tributary artificial paths have been selected (which are not wanted). \r \r 6. Next order of business is to eliminate the minor stubs with no name. Select from selection by Attributes NHDFlowline GNIS_Name > ‘0’. Now only stubs that are named remain. \r \r 7. Some of the remaining candidate artificial paths are wanted (the major rivers) and some are not (the named stubs). The named stubs can be eliminated by virtue of the fact that there are very few of them (normally one record per name) and those with low counts can be eliminated.\r \r 8. Open the NHDFlowline attribute table. Some records are selected (the remaining candidate list) and some are not (all other flowlines making up “minor rivers”). Summarize the number of records under the field GNIS_Name and write this out as Sum_Output.dbf which you then add to ArcMap.\r \r 9. Now the goal is to find the names of the major rivers. These will be rivers with a record count greater than 1. The extraneous non-named stubs have already been eliminated, which helps reduce the load. The next steps will select only records with significant counts, that is, the major rivers. This will allow deselecting the remaining NHDFlowlines and in the process eliminate the named stubs.\r \r 10. It is necessary to relate Sum_Output (key GNIS_Name) with NHDFlowline (key GNIS_Name) to make it possible to use the GNIS_NAME’s to select the major rivers in NHDFlowline.\r \r 11. Open the Sum_Output table. Note the field Count_GNIS_Name which will be used to count records. This will eliminate named stubs, leaving just the major rivers selected. Create a New Selection, Cnt_GNIS_N > 1. Leave the table open. Note major rivers are selected.Invoke the relationship to select the major rivers. In ArcMap all “major rivers” have been selected, even rivers through lakes.\r \r Note: This workflow excludes the American River, so it has been manually added into the dataset.""" ; dct:format "ZIP" ; dct:issued "2022-08-08T12:47:35.688525"^^xsd:dateTime ; dct:modified "2025-11-19T16:36:09.821740"^^xsd:dateTime ; dct:title "NHD Major Rivers and Creeks" ; dcat:accessURL ; dcat:mediaType "application/zip" . a dcat:Distribution ; dct:description "A collection of recordings of presentations and meetings by U.S. Geological Survey on the National Hydrography Dataset and related data products and tools as hosted on the USGS channel on YouTube." ; dct:format "website" ; dct:issued "2022-08-08T12:47:35.688558"^^xsd:dateTime ; dct:modified "2025-11-19T16:36:09.828506"^^xsd:dateTime ; dct:title "National Hydrography Dataset Playlist on YouTube" ; dcat:accessURL . a dcat:Distribution ; dct:description "An ArcGIS overlay map mervice for visualizing hydrographic" ; dct:format "Esri REST" ; dct:issued "2022-08-08T12:47:35.688499"^^xsd:dateTime ; dct:modified "2025-11-19T16:36:09.814830"^^xsd:dateTime ; dct:title "National Hydrography Overlay Map Service (ArcGIS)" ; dcat:accessURL . a dcat:Distribution ; dct:description "This document describes the rules that our editors of California's portion of the NHD should follow. These rules were written for editing work for the 1:24,000 scale NHD. The authors are Erik Fintel of the California State University, Chico Center for Geographical Studies, and Joel Osuna-Williams of the California State University, Northridge Center for Geospatial Science and Technology. Please direct questions to the lead steward for the California NHD at Jane.Schafer-Kramer@water.ca.gov" ; dct:format "PDF" ; dct:issued "2022-08-08T12:47:35.688522"^^xsd:dateTime ; dct:modified "2025-11-19T16:36:09.820988"^^xsd:dateTime ; dct:title "California Business Rules for Updating the National Hydrography Dataset, 2021 update" ; dcat:accessURL ; dcat:mediaType "application/pdf" . a dcat:Distribution ; dct:description "A pdf intended for poster-sized printing that provides a graphical depiction of the geodatabase schema for the current version of the National Hydrography Dataset, provided by USGS." ; dct:format "PDF" ; dct:issued "2022-08-08T12:47:35.688551"^^xsd:dateTime ; dct:modified "2025-11-19T16:36:09.826991"^^xsd:dateTime ; dct:title "NHD Data Model v2.3 Poster" ; dcat:accessURL ; dcat:mediaType "application/pdf" . a dcat:Distribution ; dct:description "Document: The Memorandum of Understanding between the United States Department of the Interior United States Geological Survey and the California Department of Water Resources for the Stewardship of the National Hydrography Dataset and Watershed Boundary Dataset in California" ; dct:format "PDF" ; dct:issued "2022-08-08T12:47:35.688476"^^xsd:dateTime ; dct:modified "2025-11-19T16:36:09.809966"^^xsd:dateTime ; dct:title "Memorandum of Understanding between USGS and DWR" ; dcat:accessURL ; dcat:mediaType "application/pdf" . a dcat:Distribution ; dct:description "You can explore the data dictionaries and specifications for the NHD on USGS' Spec-X website. Spec-X is a guide for exploring information about The National Map data products, including information about the symbols and labels used on US Topo maps, data dictionaries for the different map layers created by The National Map, and much more. Begin exploring the information behind the maps by selecting the tabs above for queries, reports, and more." ; dct:format "website" ; dct:issued "2022-08-08T12:47:35.688514"^^xsd:dateTime ; dct:modified "2025-11-19T16:36:09.818928"^^xsd:dateTime ; dct:title "National Map Specifications on Spec-X" ; dcat:accessURL . a dcat:Distribution ; dct:description "There a various ways to access the NHD data products. If you know the hydrologic unit code for your area of interest you may find it easier to download datasets by link to the amazon cloud site. This directory enables access to the NHD, NHD Plus High Resolution (NHDPlusHR), and the WBD." ; dct:format "https" ; dct:issued "2022-08-08T12:47:35.688487"^^xsd:dateTime ; dct:modified "2025-11-19T16:36:09.811692"^^xsd:dateTime ; dct:title "USGS - NHD Staged Products Directory" ; dcat:accessURL ; dcat:mediaType "application/octet-stream" . a dcat:Distribution ; dct:description """Major lakes and reservoirs in California selected from the NHD in a zipped shapefile format. Developed for use as a cartographic aid at smaller scales. The features for this dataset were selected from the National Hydrography Dataset (NHD) based on size, not on importance to any particular agency. Resource last updated 7/11/2022.\r \r Shapefiles include a .csv with the Ftype code descriptors. These descriptors can be joined to the shapefile via a join on the code field. \r \r Services for this layer may be found at: \r \r https://gis.water.ca.gov/arcgis/rest/services/InlandWaters/NHD_Major_Lakes_and_Reservoirs/FeatureServer\r \r https://gis.water.ca.gov/arcgis/rest/services/InlandWaters/NHD_Major_Lakes_and_Reservoirs/MapServer\r \r Data were originally developed and supplied by USGS, and last updated on February 20, 2020. Data was downloaded from USGS National Map Staged Products Directory (http://prd-tnm.s3-website-us-west-2.amazonaws.com/?prefix=StagedProducts/Hydrography/NHD/State/HighResolution/GDB/http://prd-tnm.s3-website-us-west-2.amazonaws.com/?prefix=StagedProducts/Hydrography/NHD/State/HighResolution/GDB/) on March 3rd, 2022.\r \r In order to display only major lakes and reservoirs, the following definition query was applied to the NHDWaterbody feature class.\r \r (FType = 390 And AreaSqKm > 5) Or (FType = 436 And AreaSqKm > 5 And Permanent_Identifier <> 'fa567cba-b37b-48b7-99d8-bd72a110fdbe' And Permanent_Identifier <> 'c5cae0f8-7d44-4149-b7ef-1b5197adc5a0' And Permanent_Identifier <> '120012522') Or GNIS_Name = 'Elderberry Forebay' Or GNIS_Name = 'Castaic Lagoon' Or Permanent_Identifier = '27088117' Or Permanent_Identifier = '27822760' Or GNIS_Name = 'Thermalito Diversion Pool' Or GNIS_Name = 'Los Banos Reservoir' Or GNIS_Name = 'Thermalito Forebay' Or GNIS_Name = 'Lake Piru' Or GNIS_Name = 'Pyramid Lake' Or GNIS_Name = 'Lake Natoma'""" ; dct:format "ZIP" ; dct:issued "2022-08-08T12:47:35.688533"^^xsd:dateTime ; dct:modified "2025-11-19T16:36:09.823209"^^xsd:dateTime ; dct:title "NHD Major Lakes and Reservoirs" ; dcat:accessURL ; dcat:mediaType "application/zip" . a dcat:Distribution ; dct:description "A short document providing guidance on using the USGS Markup Application to report errors in the NHD, WBD, and NHDPlus, along with other information about contributing to the improvement of these datasets." ; dct:format "PDF" ; dct:issued "2022-08-08T12:47:35.688547"^^xsd:dateTime ; dct:modified "2025-11-19T16:36:09.826233"^^xsd:dateTime ; dct:title "Guidance for Helping to Improve the NHD" ; dcat:accessURL ; dcat:mediaType "application/pdf" . a foaf:Agent ; foaf:name "US Migrating" .