MAIN National Wetlands Inventory (NWI) Viewer and Download

The National Wetlands Inventory (NWI) is a U.S. Fish and Wildlife Service dataset that delineates and classifies wetlands from aerial photography. Nearly 100% of the mid-Atlantic states have been completed in digital form, and these can be viewed on-line via the new Wetlands Mapper hosted by the USFWS.

In an effort to increase the utility of the NWI dataset, the MAIN provides an interface that allows the user to download the NWI data by USGS hydrologic unit code (HUC). We hope that the NWI Viewer will promote the use of these data for watershed applications, and that by providing this information as processed GIS data we may save repetitive processing steps required for using it. The NWI data may be downloaded by USGS 1:24k quadrangle or for a custom area using the Wetlands Mapper.

Launch the MAIN NWI Viewer

National Wetlands Inventory
Showing 10 of 13 ( Show All )
CollapseEnhanced Wetland Mapping on the Loomis State Forest: A Report to Northwest Ecosystem Alliance
Description: Pacific Biodiversity Institute (PBI) has produced updated and revised wetland maps to aid in evaluating a timber transfer proposal on two townships of the Loomis State Forest in North Central Washington State. Field reconnaissance of the area indicated that the majority of wetlands were incompletely mapped on existing maps by the National Wetlands Inventory (NWI). This study was conducted to aid two aspects of the proposed transfer decision. First, refined wetland data will improve the accuracy of overall biodiversity assessment in the Loomis parcels, as wetlands make a large contribution to regional biodiversity. Second, refined mapping of wetlands on the transfer parcels allows a better assessment of timber and land values, as wetlands comprise a considerable land use constraint.
Resource Type: Case Studies, Management Plans, Internet Map Services, Site Conservation Plans
Resource Format: PDF
Publisher: Pacific Biodiversity Institute
ExpandNational Wetlands Inventory
ExpandNational Wetlands Inventory
ExpandNational Wetlands Inventory - Wetlands Digital Data
ExpandNational Wetlands Inventory Mapping Project
ExpandNational Wetlands Inventory, Wetlands Digital Data
ExpandU.S. Fish & Wildlife-National Wetlands Inventory
ExpandU.S. Fish and Wildlife Service National Wetlands Inventory Mapper
ExpandU.S. Fish and Wildlife Service National Wetlands Inventory: Wetlands Mapper
ExpandWetland Codes - National Wetlands Inventory Habitat Classification
The NBII Program is administered by the Biological Informatics Program of the U.S. Geological Survey
About NBII | Accessibility Statement | NBII Disclaimer, Attribution & Privacy Statement | FOIA
Science.gov Logo       USGS Logo       USAgov Logo