National Wetland Inventory (NWI) Plus 2005 [Michigan]
State of Michigan Open Data Portal · 2005 Full Details
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Full Details
- Title
- National Wetland Inventory (NWI) Plus 2005 [Michigan]
- Description
- The National Wetland Inventory (NWI) from 2005 was produced by Great Lakes/Atlantic Region Office (GLARO) of Ducks Unlimited with funding provided by EGLE. The NWI 2005 was an update to the original 1978 NWI Layer produced by US Fish and Wildlife Service, and utilized 1998 and 2005 imagery to map wetland loss/change over time. Classification of wetlands is based on the Cowardin Wetland Classification system with a minimum mapping unit of 1/10 acre. The NWI+ data includes hydrogeomorphic classification of wetlands in addition to the normal Cowardin wetland classification, and includes functional assessment information of each wetland in the attribution. The full report on this dataset is available by request to the Wetlands, Lakes, and Streams Unit. This layer cover the LLWFA Watershed Status Map The data is updated as watershed areas are completed. Website for more information can be: https://www.michigan.gov/egle/about/organization/water-resources/wetlands/landscape-level-assessment Field Name Descriptions NWICode The wetland classification codes are a series of letter and number codes that have been developed to adapt the national wetland classification system to map form. These alpha-numeric codes correspond to the classification nomenclature that best describes a particular wetland habitat. For example, PFO1A = Palustrine (P), Forested (FO), Broad-leaved Deciduous (1), Temporarily Flooded (A). HGMCode Code for the Landscape Level Assessment. Combines each of the coded types. For example TEBAVR = Terrene Basin Vertical Flow Acres Size of the wetland polygon. NWIKey Unique Identifier Key used in the 2005 NWI update. ImageDate Date of the imagery in which the wetland polygon was mapped from. VegOrNotVeg Is the wetland vegetated or open water (non veg). EGLEType Type of wetland open water, emergent, forested, shrub scrub etc. Modifier Wetland modifier identifying excavated, ditched, impounded etc. Landform The type of geological feature in which the wetland resides. Slope (SL) Wetlands occurring on a slope of 5% or greater. Island (IS) A wetland completely surrounded by water. Fringe (FR) Wetland occurs in the shallow water zone of a permanent waterbody. *NWI water regime F, G, and H Floodplain (FP) Wetland occurs on an active alluvial plain along a river and some streams. *Modifiers FPba (Basin) and FPfl ( Flat) Basin (BA) Wetland occurs in a distinct depression. *NWI water regime C and E Flat (FL) Wetland occurs on a nearly level landform. *NWI water regime A and B Landscape_Position Landscape position values are determined by cross referencing NWI with hydrology and topography. NWI polygons that spatially intersect a stream/river in the National Hydrography Dataset (NHD) are classified as lotic. Lotic type wetlands can be further refined to indicate their adjacency to a stream or a river (lotic stream or lotic river). High resolution NHD data was used to differentiate rivers from streams in this analysis. A NHD classification completed by MDNR, Institute for Fisheries Research separated rivers by temperature gradient (cold, cool, warm) and size, based on average water flows (cubic feet per second or CFS). This dataset was used in the LLWFA analysis to mark this distinction. NWI Polygons that are determined to be within the basin of a lake are classified as lentic. Identifying the extent of a lake basin, and thus which wetlands fall within it, is done with the assistance of digital elevation models (DEM). NWI Polygons that don't intersect surface water features or aren't spatially located within a lake basin are classified as terrene Waterbody_Type Waterbody type classification is the simplest of the 4 LLWW descriptors. Ponds, lakes, and rivers are classified as such based explicitly on NWI Cowardin code. Lakes and ponds were separated at the 5-acre mark, all open-water polygons less than or equal to 5 acres were classified as ponds, while all open-water polygons larger than 5 acres were classified as lakes. The 5 acre cutoff was chosen to remain consistent with previously existing EGLE regulations. High resolution NHD data was used to differentiate rivers from streams in this analysis. A NHD classification completed by MDNR, Institute for Fisheries Research separated rivers by temperature gradient (cold, cool, warm) and size, based on average water flows (CFS) This dataset was used in the LLWFA analysis to mark this distinction. Waterflow_Path Water flow path, otherwise known as hydrodynamics, is classified by automated and manual interpretation of the intersection of NHD surface water features and NWI. Automated methods include intersecting NHD and NWI to capture throughflow wetlands (in-stream wetlands), both natural and artificial. A distinction is drawn in NHD between natural stream/river features and artificial canal/ditch features. Vegetated NWI wetlands that don't intersect any surface water body are classified as isolated. Detailed coding was developed in an effort to differentiate intermittent, artificial, and perennial connections between wetlands and other surface waterbodies. Any wetland classified as lentic (Landscape Position) is automatically assigned a water flow path of bidirectional, accounting for the tidal effects of lakes on adjacent wetlands Landform1 A secondary code used to determine type of floodplain and if a vegetated wetland is associated with a pond. Associated w/Pond (pd) Basin (ba) Flat (fl) Landscape1 Field used to display if a wetland falls within a Headwater area Headwater (hw) HMValues All function Values combined to perform the count. FunCount Number of Functions each wetland could be performing. FloodWaterStorage Function field for Flood Water Storage H (2) = High M (1) = Moderate StreamflowMaintenance Function field for Streamflow Maintenance H (2) = High M (1) = Moderate NutrientTransformation Function field for Nutrient TransformationH (2) = High M (1) = Moderate SedimentRetention Function field for Sediment Retention H (2) = High M (1) = Moderate ShorelineStabilization Function field for Shoreline Stabilization H (2) = High M (1) = Moderate FishHabitat Function field for Fish Habitat. H (2) = High M (1) = Moderate StreamShading Function field for Stream Shading H (2) = High M (1) = Moderate WaterfowlWaterbirdHabitat Function field for Waterfowl and Water Bird Habitat. H (2) = High M (1) = Moderate ShorebirdHabitat Function field for Shorebird Habitat. H (2) = High M (1) = Moderate InteriorForestBirdHabitat Function field for Interior Forest Bird Habitat. H (2) = High M (1) = Moderate AmphibianHabitat Function field for Amphibian Habitat. H (2) = High M (1) = Moderate CORIWetlandsSpecies Function field for Conservation of Rare Imperiled Wetland Speices H (2) = High M (1) = Moderate GroundWaterInfluence Function field for Ground Water Influence H (2) = High M (1) = Moderate CarbonSequestration Function field for Carbon Sequestration H (2) = High M (1) = Moderate PathogenRentention Function field for Pathogen Retention 1 = Wetlands that intersect 303d listed streams, 2 = Wetlands within a 500 ft buffer of 303d streams, 3 Streams that intersect wetlands that filter Pathogens, 4 wetlands within a 500 ft buffer that filter pathogens. For historical wetlands this would be showing best areas to do potential restoration. For more information about this content reach out to Jeremy Jones at jonesj28@michigan.gov .
- Creator
- Michigan Dept. of Environment, Great Lakes, and Energy
- Publisher
- State of Michigan Open Data Portal
- Temporal Coverage
- 2005
- Date Issued
- 2021-03-19
- Rights
- This application or dataset, along with any maps, data, content and other information contained within it and all output from the application (together the “Information”), is provided as a public service, and there are no restrictions on the use, reproduction, or distribution of the Information. It is your responsibility to use the Information for a legally permissible purpose. This Information is provided “AS IS” and on an “AS AVAILABLE” basis. The State of Michigan (“State”) makes no warranties, express or implied, regarding the accuracy, adequacy, reliability, timeliness, or completeness of this Information. THE STATE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS INFORMATION, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NONINFRINGEMENT OF PROPRIETARY RIGHTS. THE STATE WILL NOT BE LIABLE, REGARDLESS OF THE FORM OF ACTION, WHETHER IN CONTRACT, TORT, NEGLIGENCE, STRICT LIABILITY OR BY STATUTE OR OTHERWISE, FOR ANY CLAIM FOR CONSEQUENTIAL, INCIDENTAL, INDIRECT, OR SPECIAL DAMAGES, INCLUDING WITHOUT LIMITATION LOST PROFITS AND LOST BUSINESS OPPORTUNITIES, RELATED TO THE ACCESS OR USE OF THIS INFORMATION. IN NO EVENT WILL THE STATE BE LIABLE FOR ANY AMOUNTS THAT MAY RESULT FROM THE ACCESS OR USE OF THIS INFORMATION, REGARDLESS OF THE FORM OF ACTION, WHETHER IN CONTRACT, TORT, NEGLIGENCE, STRICT LIABILITY, OR BY STATUTE OR OTHERWISE. By accessing or using this Information, you agree that you will not make any claims against the State or any of its departments, divisions, officers, or employees related to your use of the Information. These terms are governed by and interpreted under the laws of the State of Michigan without regard to conflict of laws provisions. Nothing in these terms is meant to impact or replace any existing rights or licenses, such as copyright, trademark, or patent protections, in materials or content that may be located on the site or portal containing the Information.
- Access Rights
- Public
- Format
- ArcGIS DynamicMapLayer
- Language
- English
- Date Added
- August 10, 2025
- Provenance Statement
- The metadata for this resource was last retrieved from State of Michigan Open Data Portal on 2026-01-08.
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Cite and Reference
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Citation
Michigan Dept. of Environment, Great Lakes, and Energy (2021). National Wetland Inventory (NWI) Plus 2005 [Michigan]. State of Michigan Open Data Portal. https://gis-michigan.opendata.arcgis.com/datasets/egle::national-wetland-inventory-nwi-plus-2005 (web service) -
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