U.S. Fish & Wildlife ServiceUpland to Open Water Difference Product for HUC12 subwatersheds in the contiguous U.S. Watersheds with ≤0.5% of upland to open water difference, calculated by area, are displayed in light blue, while those that have greater than 2% difference are displayed in dark blue. The ≤0.5% category is filtered out in many web maps to improve performance. Patterns are largely controlled by the age of National Wetlands Inventory (NWI) data and land cover trends, including the addition or increase in pond and lake area via natural and anthropogenic forces. Areas exhibiting the greatest amount of difference (i.e., change) include the Prairie Pothole Region and the southeastern U.S. Geographies with the greatest levels of difference could be prioritized for NWI updates.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/99a05883c2b4404294ce1c20b1698f71_0engU.S. Fish and Wildlife Service Open DataPublicupland to nlcd open water [United States]Web servicesUnited StatesLast Modified: 2023-07-13