U.S. Fish & Wildlife ServiceFeature Service for the NWI 50th Anniversary Storymap comparing the old vs. new NWI data. Modern NWI data is a significant update, including better classification, more detailed linework and higher accuracy. Modern NWI data is also standardized. This layer was created by Lauren Healey of the National Wetlands Inventory Team (NWI). Not editable or available for offline use. It includes layers for: new NWI data in West Virginia, and old NWI data for West Virginia. The layers can be toggled on and off for comparision purposes. The modern NWI data was published to the Wetlands Mapper in 2024 and 2025 This data is maintained by Lauren Healey at the NWI team. Please contact lauren_healey@fws.gov with any questions.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/709ffe42a9024850bf38ac1489e07e58_1engU.S. Fish and Wildlife Service Open DataPublicWV Wetlands old [United States]Web servicesUnited StatesLast Modified: 2026-04-24