• Organization: State of Maryland
• Updated: 2025-05-05

This is a MD iMAP hosted service layer. Find more information at http://imap.maryland.gov. Hydrologic unit boundaries define the aerial extent of surface water drainage to a point. Hydrologic...

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• Organization: Department of the Interior
• Updated: 2020-11-17T00:00:00Z

These datasets consist of a workspace (folder) containing a collection of gridded datasets plus a personal geodatabase containing several vector datasets. These datasets are designed to be used...

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• Organization: Department of the Interior
• Updated: 2020-11-17T00:00:00Z

These datasets each consist of a workspace (folder) containing a collection of gridded datasets plus a personal geodatabase containing several vector datasets. These datasets are designed to be...

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• Organization: U.S. Environmental Protection Agency
• Updated: 2024-07-30T00:00:00.000+00:00

The Percentage Potential Wetland Area by HUC-12 (Pct_PWA) layer shows areas where conditions may be suitable for wetland restoration or creation at a 10-m resolution. Since the 1600's, an...

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• Organization: Department of the Interior
• Updated: 2025-08-26T00:00:00Z

The Florida Flood Hub for Applied Research and Innovation and the U.S. Geological Survey have developed projected future change factors for precipitation depth-duration-frequency (DDF) curves at...

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• Organization: U.S. Environmental Protection Agency
• Updated: 2015-05-07T00:00:00.000+00:00

This EnviroAtlas dataset identifies rare ecosystems using base landcover data from the USGS GAP Analysis Program (Version 2, 2011) combined with landscape ecology principles. The metrics included...

• Organization: U.S. Environmental Protection Agency
• Updated: 2024-07-30T00:00:00.000+00:00

The Percentage Potential Wetland Area by HUC-12 on Cultivated Cropland (Pct_PWAC) layer shows areas where conditions may be suitable for wetland restoration or creation on cropland at a 10-m...

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• Organization: U.S. Environmental Protection Agency
• Updated: 2018-01-24T00:00:00.000+00:00

This EnviroAtlas dataset estimates population by 12-digit HUC. It is based on the EnviroAtlas dasymetric dataset, which intelligently reallocates 2010 population from census blocks to 30 meter...

• Organization: Department of the Interior
• Updated: 2021-11-02T00:00:00Z

This file contains five metrics that were selected to collectively represent the adaptive capacity of each of the 360 HUC-8 watersheds in US Fish and Wildlife Service Region 3 (Illinois, Indiana,...

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• Organization: U.S. Environmental Protection Agency
• Updated: 2018-10-23T00:00:00.000+00:00

This EnviroAtlas dataset contains a count of the number of local farmers markets within each subwatershed (12-digit HUC) based on their location given within the USDA National Farmers Market...

• Organization: U.S. Environmental Protection Agency
• Updated: 2021-07-30T00:00:00.000+00:00

This dataset shows the percentage of each Watershed Boundary Dataset (WBD) 12-digit Hydrologic Unit (HUC) that is included in the USGS National Gap Analysis Program (GAP) or International Union...

• Organization: U.S. Environmental Protection Agency
• Updated: 2021-07-30T00:00:00.000+00:00

This dataset shows the percentage of each National Hydrography Dataset Plus (NHDPlus) V2 12-digit Hydrologic Unit (HUC) that is included in the USGS National Gap Analysis Program (GAP) or...

• Organization: U.S. Environmental Protection Agency
• Updated: 2023-04-12T00:00:00.000+00:00

This EnviroAtlas dataset depicts the total waterbody area by 12-digit HUC for the Conterminous US from the US Geological Survey's high-resolution National Hydrography Dataset (NHD). This dataset...

• Organization: Department of the Interior
• Updated: 2025-08-26T00:00:00Z

The Florida Flood Hub for Applied Research and Innovation and the U.S. Geological Survey have developed projected future change factors for precipitation depth-duration-frequency (DDF) curves at...

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• Organization: U.S. Environmental Protection Agency
• Updated: 2019-08-01T00:00:00.000+00:00

This EnviroAtlas dataset represents the percentage of land area that is classified as natural, forest, wetland, agricultural, natural, and developed land cover using the EnviroAtlas composite of...

• Organization: U.S. Environmental Protection Agency
• Updated: 2020-10-01T00:00:00.000+00:00

This EnviroAtlas dataset represents the percentage of land area that is classified as tree canopy cover using the National Land Cover Database 2016 USFS Tree Canopy Cover dataset for each 12-digit...

• Organization: U.S. Environmental Protection Agency
• Updated: 2016-10-28T00:00:00.000+00:00

This EnviroAtlas national map displays the mean phosphorus (P) balance between inorganic fertilizer and confined manure inputs and P crop removal on croplands in the conterminous United States...

• Organization: U.S. Environmental Protection Agency
• Updated: 2016-06-13T00:00:00.000+00:00

This EnviroAtlas dataset portrays the total number of historic places located within each 12-digit Hydrologic Unit (HUC). The historic places data were compiled from the National Park Service's...

• Organization: U.S. Environmental Protection Agency
• Updated: 2020-05-28T00:00:00.000+00:00

This EnviroAtlas dataset represents the percentage of land area that is classified as natural, forest, wetland, agricultural, natural, and developed land cover as well as those labeled tundra,...

• Organization: U.S. Environmental Protection Agency
• Updated: 2022-03-25T00:00:00.000+00:00

This EnviroAtlas dataset represents the percentage of land area within each 12-digit hydrologic unit code (HUC) in the conterminous United State that is impervious to water infiltration using the...