Overview
This Feature Service provides comprehensive geospatial data on the extent, approximate location, and types of wetlands and deepwater habitats across the United States and its Territories. The data represent wetlands and surface waters as defined by Cowardin et al. (1979) and incorporate both polygonal and linear wetland features, supplemented with hydrography from the U.S. Geological Survey's National Hydrography Dataset.
Feature Layer
Geographic Coverage
The dataset covers wetlands and deepwater habitats throughout the United States and its Territories, providing valuable insights into national aquatic and wetland resources.
Use Cases
Access and Data Quality
The data were compiled from aerial imagery and supplemented with authoritative hydrography datasets. Certain limitations apply due to the nature of data acquisition, notably the exclusion of some submerged and deepwater habitats. Updated mapping efforts enhance the currency and accuracy of the dataset where newer surveys have been conducted. Data are sourced from: https://geodata.tn.gov/datasets/b02ce30ef95b45c8a50f19f54b40ab5e_0/about
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Precautions - Federal, state, and local regulatory agencies with jurisdiction over wetlands may define and describe wetlands in a different manner than that used in this inventory. There is no attempt, in either the design or products of this inventory, to define the limits of proprietary jurisdiction of any Federal, state, or local government or to establish the geographical scope of the regulatory programs of government agencies. Persons intending to engage in activities involving modifications within or adjacent to wetland areas should seek the advice of appropriate federal, state, or local agencies concerning specified agency regulatory programs and proprietary jurisdictions that may affect such activities. Acknowledgement of the U.S. Fish and Wildlife Service and (or) the National Wetlands Inventory would be appreciated in products derived from these data.
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(1979) and incorporate both polygonal and linear wetland features, supplemented with hydrography from the U.S. Geological Survey's National Hydrography Dataset. Feature Layer National Wetlands Inventory: This layer delineates wetland and deepwater habitats including various wetland types and surface waters. It includes updated mapping, especially for states like Washington, Oregon, California, Nevada, and Idaho from 2012 onward, capturing all surface water features rather than derived data. The dataset excludes certain habitats like submerged aquatic vegetation in estuarine and coastal waters, some deepwater reef communities, and particular types of farmed wetlands as defined by policy. For detailed mapping procedures and metadata, this layer is intended to be used alongside the Wetlands_Project_Metadata dataset. Geographic Coverage The dataset covers wetlands and deepwater habitats throughout the United States and its Territories, providing valuable insights into national aquatic and wetland resources. Use Cases Environmental resource management and conservation planning. Wetland protection and regulatory compliance analyses. Hydrological and ecological research. Supporting habitat restoration and monitoring efforts. Informing land use planning and development impact assessments. Access and Data Quality The data were compiled from aerial imagery and supplemented with authoritative hydrography datasets. Certain limitations apply due to the nature of data acquisition, notably the exclusion of some submerged and deepwater habitats. Updated mapping efforts enhance the currency and accuracy of the dataset where newer surveys have been conducted. 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These data delineate the areal extent of wetlands and surface waters as defined by Cowardin et al. (1979). The National Wetlands Inventory - Version 2, Surface Waters and Wetlands Inventory was derived by retaining the wetland and deepwater polygons that compose the NWI digital wetlands spatial data layer and reintroducing any linear wetland or surface water features that were orphaned from the original NWI hard copy maps by converting them to narrow polygonal features. Additionally, the data are supplemented with hydrography data, buffered to become polygonal features, as a secondary source for any single-line stream features not mapped by the NWI and to complete segmented connections. Wetland mapping conducted in WA, OR, CA, NV and ID after 2012 and most other projects mapped after 2015 were mapped to include all surface water features and are not derived data. The linear hydrography dataset used to derive Version 2 was the U.S. Geological Survey's National Hydrography Dataset (NHD). Specific information on the NHD version used to derive Version 2 and where Version 2 was mapped can be found in the 'comments' field of the Wetlands_Project_Metadata feature class. Certain wetland habitats are excluded from the National mapping program because of the limitations of aerial imagery as the primary data source used to detect wetlands. These habitats include seagrasses or submerged aquatic vegetation that are found in the intertidal and subtidal zones of estuaries and near shore coastal waters. Some deepwater reef communities (coral or tuberficid worm reefs) have also been excluded from the inventory. These habitats, because of their depth, go undetected by aerial imagery. By policy, the Service also excludes certain types of \"farmed wetlands\" as may be defined by the Food Security Act or that do not coincide with the Cowardin et al. definition. Contact the Service's Regional Wetland Coordinator for additional information on what types of farmed wetlands are included on wetland maps. This dataset should be used in conjunction with the Wetlands_Project_Metadata layer, which contains project specific wetlands mapping procedures and information on dates, scales and emulsion of imagery used to map the wetlands within specific project boundaries.