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An official website of the United States government

Web Tools

The National Hydrography Dataset web tools is an interactive web mapping site that provides access to National Hydrography status maps and map applications. 

Download Data & Maps from The National Map

The National Map Downloader is the primary search and download application for USGS topographic maps and base-layer GIS data.

The National Map Viewer

Use The National Map Viewer to explore GIS data, see availability of USGS topographic maps, and create your own web map.