This data resource is a layer in a map service. To download it, please go to the "Layers" section of this page and click the name of the dataset. This will open a new page that features a download button. Open the Map Service: https://gis.chesapeakebay.net/ags/rest/services/Boundaries/CB_basin_WBD/MapServer

This outline of the Chesapeake Bay Basin boundary is based on the U.S. Geologiacl Suvey National Watershed Boundary Dataset. Watersheds in the Chesapeake Bay Basin were dissolved to create the basin boundary V2. A newer version is available here: https://data.chesapeakebay.net/datasets/modified-chesapeake-bay-watershed-boundary/about

This data resource is a layer in a map service. To download it, please go to the "Layers" section of this page and click the name of the dataset. This will open a new page that features a download button. Open the Map Service: https://gis.chesapeakebay.net/ags/rest/services/Modeling/salinity_surface/MapServer This map service depicts interpolated mean salinity throughout the Chesapeake Bay and its tidal tributaries from 1985 through 2018. Salinity in the Chesapeake Bay and its tidal tributaries varies from season to season and year to year, and depends largely on the amount of freshwater flowing into the Bay. Salinity affects such things as underwater grass species distribution, fish spawning habitat, oyster distribution and the likely distribution of the oyster-killing parasites Dermo and MSX.

The Digital Benthic Habitat-GIS Map of Florida Bay (1991-1995 Substrate), Florida is composed of GIS data layers and GIS tables, and is available in the following GRI-supported GIS data formats: 1.) a 10.1 file geodatabase (ever_benthic_habitat.gdb), a 2.) Open Geospatial Consortium (OGC) geopackage, and 3.) 2.2 KMZ/KML file for use in Google Earth, however, this format version of the map is limited in data layers presented and in access to GRI ancillary table information. The file geodatabase format is supported with a 1.) ArcGIS Pro map file (.mapx) file (ever_benthic_habitat.mapx) and individual Pro layer (.lyrx) files (for each GIS data layer), as well as with a 2.) 10.1 ArcMap (.mxd) map document (ever_benthic_habitat.mxd) and individual 10.1 layer (.lyr) files (for each GIS data layer). The OGC geopackage is supported with a QGIS project (.qgz) file. Upon request, the GIS data is also available in ESRI 10.1 shapefile format. Contact Stephanie O'Meara (see contact information below) to acquire the GIS data in these GIS data formats. In addition to the GIS data and supporting GIS files, three additional files comprise a GRI digital geologic-GIS dataset or map: 1.) A GIS readme file (ever_geology_gis_readme.pdf), 2.) the GRI ancillary map information document (.pdf) file (ever_geology.pdf) which contains geologic unit descriptions, as well as other ancillary map information and graphics from the source map(s) used by the GRI in the production of the GRI digital geologic-GIS data for the park, and 3.) a user-friendly FAQ PDF version of the metadata (ever_benthic_habitat_metadata_faq.pdf). Please read the ever_geology_gis_readme.pdf for information pertaining to the proper extraction of the GIS data and other map files. Google Earth software is available for free at: https://www.google.com/earth/versions/. QGIS software is available for free at: https://www.qgis.org/en/site/. Users are encouraged to only use the Google Earth data for basic visualization, and to use the GIS data for any type of data analysis or investigation. The data were completed as a component of the Geologic Resources Inventory (GRI) program, a National Park Service (NPS) Inventory and Monitoring (I&M) Division funded program that is administered by the NPS Geologic Resources Division (GRD). For a complete listing of GRI products visit the GRI publications webpage: For a complete listing of GRI products visit the GRI publications webpage: https://www.nps.gov/subjects/geology/geologic-resources-inventory-products.htm. For more information about the Geologic Resources Inventory Program visit the GRI webpage: https://www.nps.gov/subjects/geology/gri,htm. At the bottom of that webpage is a "Contact Us" link if you need additional information. You may also directly contact the program coordinator, Jason Kenworthy (jason_kenworthy@nps.gov). Source geologic maps and data used to complete this GRI digital dataset were provided by the following: National Oceanic and Atmospheric Administration Coastal Services Center. Detailed information concerning the sources used and their contribution the GRI product are listed in the Source Citation section(s) of this metadata record (ever_benthic_habitat_metadata.txt or ever_benthic_habitat_metadata_faq.pdf). Users of this data are cautioned about the locational accuracy of features within this dataset. Based on the source map scale of 1:48,000 and United States National Map Accuracy Standards features are within (horizontally) 24.4 meters or 80 feet of their actual _location as presented by this dataset. Users of this data should thus not assume the _location of features is exactly where they are portrayed in Google Earth, ArcGIS, QGIS or other software used to display this dataset. All GIS and ancillary tables were produced as per the NPS GRI Geology-GIS Geodatabase Data Model v. 2.3. (available at: https://www.nps.gov/articles/gri-geodatabase-model.htm).

This data is part of the series of maps that covers the whole of Australia at a scale of 1:250 000 (1cm on a map represents 2.5km on the ground) and comprises 513 maps. This is the largest scale at which published topographic maps cover the entire continent. Data is downloadable in various distribution formats.

This GIS dataset includes soundings, bathymetric contours and bathymetric areas.

The spatial extent of the data ranges from the coast of Kemp Land to the western end of the West Ice Shelf.

The data have been formatted according to the SCAR Feature Catalogue (see Related URL).

Some of the data are displayed in the map 'Prydz Bay', a 1:1000000 bathymetric map published in September 1997, map number 7 in the SCAR Map Catalogue (see Related URL).

Does not conform to Australian Antarctic Spatial Model.

Open the Data Resource: https://gis.chesapeakebay.net/ags/rest/services/WIP/CBPTidalStationsGAMResults/MapServer The Chesapeake Bay tidal water quality monitoring program is carried out in partnership with Maryland, Virginia and the U.S. Environmental Protection Agency. Water quality parameters such as temperature, salinity, dissolved oxygen, clarity, chlorophyll-a, nitrogen and phosphorus are measured at more than 100 stations at least once a month. Trends in water quality parameters are analyzed by state agency and Chesapeake Bay Program partners using a Generalized Additive Model (GAM) statistical approach. More information about the tidal water quality monitoring program and GAM methods can be found here: https://www.chesapeakebay.net/who/group/integrated-trends-analysis-team

Narragansett Bay, Little Narragansett Bay, and the Southwest Coastal Ponds are the three estuarine study areas under the purview of the Narragansett Bay Estuary Program (NBEP). This dataset represents all coastal waters and the coastline of Rhode Island and portions of coastline in neighboring Connecticut and Massachusetts, segmented according to all available information and the most common delineations of NBEP’s study areas. It includes the estuaries, the salt ponds, and estuarine tributaries. Segments are the smallest divisions of the Bay used for analysis in the 2017 State of Narragansett Bay & Its Watershed Technical Report (nbep.org). The boundaries of NBEP estuarine waters correspond to delineations by researchers studying the Bay. The Estuary Program compiled all available information and used the most common delineations to define estuarine waters. The upper boundaries of the estuarine waters correspond to the limits of tidal waters defined by: (1) the presence of existing dams (as of 2016) and (2) the extent of estuarine waters as defined and delineated by the states to assess water quality and shellfishing areas. The outer boundary of Narragansett Bay spans Point Judith and Sakonnet Point. See below for a full listing of data sources. This dataset is intended for use in general planning, GIS analysis, and mapping at watershed and subwatershed scales. For more information, please reference the 2017 State of Narragansett Bay & Its Watershed Technical Report (nbep.org).

This layer contains the Chesapeake Bay watershed boundary.

This data is part of the series of maps that covers the whole of Australia at a scale of 1:250 000 (1cm on a map represents 2.5km on the ground) and comprises 513 maps. This is the largest scale at which published topographic maps cover the entire continent. Data is downloadable in various distribution formats.

This data is part of the series of maps that covers the whole of Australia at a scale of 1:250 000 (1cm on a map represents 2.5km on the ground) and comprises 513 maps. This is the largest scale at which published topographic maps cover the entire continent. Data is downloadable in various distribution formats.

The dataset contains locations and attributes of HUC-11 watersheds. The USGS presents a detailed explanation of HUCs at https://water.usgs.gov/GIS/huc.html. HUC-11 boundaries are compiled by each state. The export files of HUC-11 at the state level were provided by each respective state and are unmodified. HUC-11 boundaries for Delaware are not yet available. Also, a small portion of the Chesapeake Basin in NY State has not yet been completed.

This layer depicts the Chesapeake Bay Preservation Act (CBPA) areas in Hampton Roads, Virginia, categorized into three delineations: Resource Protection Areas (RPA) include both tidal and connected non-tidal wetlands, as well as tidal shores, and a landward riparian buffer of 100 feet which has the greatest potential to protect and benefit water quality. Resource Management Areas (RMA) area adjacent to the RPA and have the potential to damage water quality without proper management. Only those RMA areas that have a designated boundary are in included in this layer. Some localities define the RMA as the remaining area of the locality that is not in the RPA and therefore no separate boundary is needed.Intensely Developed Areas (IDA) must be designated in the city or county code. Not all localities have designated IDAs. An IDA overlays redevelopment areas that may otherwise be subjected to stricter enforcement of the RPA.Note that the areas provided in this layer are meant for general planning use. Use the CBPA Address Locator application to see if a property is in or near the CBPA. Consult with local CBPA staff for questions about the determination and enforcement of CBPA areas. Data last updated: September 2020

In 1984, the General Assembly enacted the Chesapeake Bay Critical Area Act to regulate development, manage land use and conserve natural resources on land in those areas designated as Critical Area. For this document, the Critical Area is all land and water areas within 1000 feet of the tidal waters' edge or from the landward edge of adjacent tidal wetlands and the lands under them. Georeferenced digital data files of the critical Area have been produced for Baltimore City and the 16 Maryland counties with land located within the Critical Area. The digital maps produced for each jurisdiction are polygons depicting the Critical Area and the land use classifications recognized by the Chesapeake Bay Critical Area Commission (CBCAC). Each jurisdiction is a separate file. The data were produced from hard copy parcel maps originally submitted by the counties as part of the requirements for developing their Critical Area Program. For the purpose of the MD iMap web service the Critical Area Data is displayed by two data layers, one general layer and one layer showing the available critical area data for local towns.This is a MD iMAP hosted service. Find more information at https://imap.maryland.gov.Feature Service Link: https://geodata.md.gov/imap/rest/services/Environment/MD_CriticalAreas/MapServer/1

Narragansett Bay, Little Narragansett Bay, and the Southwest Coastal Ponds are the three estuarine study areas under the purview of the Narragansett Bay Estuary Program. This dataset represents the drainage areas of the major rivers that flow into NBEP’s estuarine study areas. The four river basins in Narragansett Bay are defined as the area of the landscape that drains into the Taunton, Blackstone, and Pawtuxet Rivers and their tributaries as well as the drainage area for Coastal Narragansett Bay, which encompasses all land that drains directly into Narragansett Bay. The areal extents of river basins in Narragansett Bay were delineated based on grouping Watershed Planning Areas (WPAs) according to major rivers and their tributaries (for more information about the development of WPAs, see WPA_NBEP2017). River basins were not derived from the U.S. Geological Survey hierarchical system of hydrologic units, but WPA groupings were informed by MassGIS Major Watersheds (2000) and USGS HUC10 boundaries (2015). The Little Narragansett Bay and the Southwest Coastal Ponds drainage areas were not segmented further into river basins (for more information about the boundary of the Little Narragansett Bay watershed, see STUDYAREAS_NBEP2017). River basin coastlines were updated with NBEP’s estuarine coastline delineation (for details about NBEP’s coastline delineation, see metadata for BAYS_NBEP2019). This dataset is intended for use in general planning, GIS analysis, and mapping at watershed and subwatershed scales. For more information, please reference the 2017 State of Narragansett Bay & Its Watershed Technical Report (nbep.org).

This eelgrass layer includes the maximum extent of eelgrass beds that have been surveyed in the San Francisco Bay shown in green. It was created by merging the Bay-wide eelgrass surveys conducted by Merkel & Associates, Inc. (Merkel) in 2003, 2009, 2014, and a Richardson Bay survey conducted by Merkel in 2019. Merkel has granted permission for public use of these data. These eelgrass surveys represent the best available data on comprehensive eelgrass extent throughout San Francisco Bay in 2021 and are developed using a combination of acoustic and aerial surveys and site-specific ground truthing. This layer may be used as a reference to determine potential direct and indirect impacts to eelgrass habitat from dredging projects. These data do not replace the need for site-specific eelgrass surveys.Data from the 2003, 2009, and 2014 eelgrass surveys and associated Merkel reports which include information on mapping methodology are available for download on the San Francisco Estuary Institute’s (SFEI) website. Methods for creating this layer are as follows:Downloaded the Merkel Baywide Eelgrass Surveys for 2003, 2009, and 2014 from SFEI and combined into a single layer. Obtained original Richardson Bay 2019 eelgrass survey data from Merkel. Loaded all layers into ArcGIS Pro © ESRI and re-projected all data to the NAD 1983 UTM Zone 10N coordinate system. Ran union of both the SFEI and Richardson Bay 2019 layers. Merged features to create one single attribute table for eelgrass cover from all survey years. Removed extraneous columns in the attribute table, recalculated area fields based on new extent, and applied symbology.

This mapping tool provides a representation of the general watershed boundaries for stream systems declared fully appropriated by the State Water Board. The boundaries were created by Division of Water Rights staff by delineating FASS critical reaches and consolidating HUC 12 sub-watersheds to form FASS Watershed boundaries. As such, the boundaries are in most cases conservative with respect to the associated stream system. However, users should check neighboring FASS Watersheds to ensure the stream system of interest is not restricted by other FASS listings. For more information regarding the Declaration of Fully Appropriated Stream Systems, visit the Division of Water Rights’ Fully Appropriated Streams webpage. How to Use the Interactive Mapping Tool: If it is your first time viewing the map, you will need to click the “OK” box on the splash screen and agree to the disclaimer before continuing. Navigate to your point of interest by either using the search bar or by zooming in on the map. You may enter a stream name, street address, or watershed ID in the search bar. Click on the map to identify the location of interest and one or more pop-up boxes may appear with information about the fully appropriated stream systems within the general watershed boundaries of the identified location. The information provided in the pop-up box may include: (a) stream name, (b) tributary, (c) season declared fully appropriated, (d) Board Decisions/Water Right Orders, and/or (e) court references/adjudications. You may toggle the FAS Streams reference layer on and off to find representative critical reaches associated with the FASS Watershed layer. Please note that this layer is for general reference purposes only and ultimately the critical reach listed in Appendix A of Water Rights Order 98-08 and Appendix A together with any associated footnotes controls. Note: A separate FAS Watershed boundary layer was created for the Bay-Delta Watershed. The Bay-Delta Watershed layer should be toggled on to check if the area of interest is fully appropriated under State Water Board Decision 1594.

**THIS NEWER 2016 DIGITAL MAP REPLACES THE OLDER 2014 VERSION OF THE GRI GATE Geomorphological-GIS data. The Unpublished Digital Pre-Hurricane Sandy Geomorphological-GIS Map of the Jamaica Bay Unit, Gateway National Recreation Area, New York is composed of GIS data layers and GIS tables in a 10.1 file geodatabase (jaba_geomorphology.gdb), a 10.1 ArcMap (.MXD) map document (jaba_geomorphology.mxd), individual 10.1 layer (.LYR) files for each GIS data layer, an ancillary map information (.PDF) document (gate_geomorphology.pdf) which contains source map unit descriptions, as well as other source map text, figures and tables, metadata in FGDC text (.TXT) and FAQ (.HTML) formats, and a GIS readme file (gate_gis_readme.pdf). Please read the gate_gis_readme.pdf for information pertaining to the proper extraction of the file geodatabase and other map files. To request GIS data in ESRI 10.1 shapefile format contact Stephanie O’Meara (stephanie.omeara@colostate.edu; see contact information below). The data is also available as a 2.2 KMZ/KML file for use in Google Earth, however, this format version of the map is limited in data layers presented and in access to GRI ancillary table information. Google Earth software is available for free at: http://www.google.com/earth/index.html. Users are encouraged to only use the Google Earth data for basic visualization, and to use the GIS data for any type of data analysis or investigation. The data were completed as a component of the Geologic Resources Inventory (GRI) program, a National Park Service (NPS) Inventory and Monitoring (I&M) Division funded program that is administered by the NPS Geologic Resources Division (GRD). Source geologic maps and data used to complete this GRI digital dataset were provided by the following: Rutgers University Institute of Marine and Coastal Sciences. Detailed information concerning the sources used and their contribution the GRI product are listed in the Source Citation section(s) of this metadata record (jaba_pre-sandy_metadata_faq.html; available at http://nrdata.nps.gov/geology/gri_data/gis/gate/jaba_pre-sandy_metadata_faq.html). Users of this data are cautioned about the locational accuracy of features within this dataset. Based on the source map scale of 1:6,000 and United States National Map Accuracy Standards features are within (horizontally) 5.08 meters or 16.67 feet of their actual _location as presented by this dataset. Users of this data should thus not assume the _location of features is exactly where they are portrayed in Google Earth, ArcGIS or other software used to display this dataset. All GIS and ancillary tables were produced as per the NPS GRI Geology-GIS Geodatabase Data Model v. 2.3. (available at: http://science.nature.nps.gov/im/inventory/geology/GeologyGISDataModel.cfm). The GIS data projection is NAD83, UTM Zone 18N, however, for the KML/KMZ format the data is projected upon export to WGS84 Geographic, the native coordinate system used by Google Earth. The data is within the area of interest of Gateway National Recreation Area

This dataset contains polygon features representing the Chesapeake Bay Preservation Areas.

Data collected and complied by Department of City Planning maintained on as needed basis by the Department of City Planning.

Any land designated by the city pursuant to Part III of the Chesapeake Bay Preservation Area Designation and Management Regulations, 9 VAC 10-20-70, and section 10.1-2107 of the Code of Virginia. A Chesapeake Bay Preservation Area shall consist of a resource protection area and a resource management area.

The Chesapeake Bay and its tributaries constitute an important and productive estuarine system, providing economic and social benefits to the citizens of the City of Norfolk and the Commonwealth of Virginia. The health of the Chesapeake Bay is vital to maintaining the city's economy and the welfare of its citizens. The intent of the city and the purposes of the Overlay District are to: (1) protect existing high quality state waters; (2) restore all other state waters to a condition or quality that will permit all reasonable public uses and will support the propagation and growth of all aquatic life, including game fish, which might reasonably be expected to inhabit them; (3) safeguard the clean waters of the Commonwealth from pollution; (4) prevent any increase in pollution; (5) reduce existing pollution; and (6) promote water resource conservation in order to provide for the health, safety, and welfare of the present and future citizens of the city.

Any and all data sets are for graphical representations only and should not be used for legal purposes. Any determination of topography or contours, or any depiction of physical improvements, property lines or boundaries is for general information only and shall not be used for the design, modification, or construction of improvement to real property or for flood plain determination.

The dataset can be available using the link:https://norfolkgisdata-orf.opendata.arcgis.com/datasets/712ae93509fb4bb6947bab945d30bd77_0/about

This vector dataset contains estuarine water quality classifications for 2014 in the Narragansett Bay, Little Narragansett Bay, and Southwest Coastal ponds. Water quality classifications were based on Massachusetts and Rhode Island Assessment Databases for 2014 (MassDEP 2015, RIDEM 2015). This assessment specifically focuses on causes of water quality impairment that are detrimental to recreational use with an emphasis on pathogen pollution. The Estuary Program re-classified water quality in four categories. The first, “Acceptable” includes waters that fully support recreational use, equivalent to a “fully supporting” determination by the states. The second category, “Impacted by Pathogens,” includes waters that are “not supporting” of recreational use due to impact by pathogens. To determine water quality conditions for recreational use, the states also make assessments based on other parameters, such as odor, that are unrelated to pathogens. Thus, the third category included waters “Impacted by Other,” i.e., waters that were “not supporting” of recreational use due to parameters other than pathogens. The fourth category, “Unassessed for Recreational Use,” includes waters that are assessed by the states for other uses (e.g., Aquatic Life Use), but not for Recreational Use. Area is calculated in square miles. This dataset is intended for use in general planning, GIS analysis, and graphic display at watershed and subwatershed scales. For more information, please reference the Integrated List reporting from Massachusetts and Rhode Island as well as the 2017 State of Narragansett Bay & Its Watershed Technical Report (nbep.org).

GIS representations of 1940 Historical seagrass coverage in Perdido Bay from United States Geological Survey/National Wetlands Research Center (USGS/NWRC).