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• Organization: Department of the Interior
• Updated: 20250228 | Harvested: September 29, 2025 at 04:48 AM

The Watershed Boundary Dataset (WBD) is a comprehensive aggregated collection of hydrologic unit data consistent with the national criteria for delineation and resolution. It defines the areal...

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• Organization: Department of the Interior
• Updated: 20230913 | Harvested: July 16, 2025 at 04:12 AM

The National Hydrography Dataset (NHD) is a feature-based database that interconnects and uniquely identifies the stream segments or reaches that make up the nation's surface water drainage...

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• Organization: Department of the Interior
• Updated: 20230913 | Harvested: July 18, 2025 at 10:31 AM

The High Resolution National Hydrography Dataset Plus (NHDPlus HR) is an integrated datset of geospatial data layers, including the most current National Hydrography Dataset (NHD),...

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