Search datasets
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The Walkability Index dataset characterizes every Census 2019 block group in the U.S. based on its relative walkability. Walkability depends upon characteristics of the built environment that...
Search relevance: 1.00 | Views last month: 58 | Catalog Last Checked: August 03, 2026 at 04:49 AM -
This web service depicts nearly 17,000 neighborhood boundaries in over 650 U.S. cities. Zillow created the neighborhood boundaries and is sharing them with the public under a Creative Commons...
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Nitrogen, phosphorus, and suspended-sediment loads, and changes in loads, in major rivers across the Chesapeake Bay watershed have been calculated using monitoring data from the Chesapeake Bay...
Search relevance: 1.00 | Views last month: 19 | Catalog Last Checked: August 01, 2026 at 03:10 AM -
Nitrogen, phosphorus, and suspended-sediment loads, and changes in loads, in rivers across the Chesapeake Bay watershed have been calculated using monitoring data from the Chesapeake Bay Nontidal...
Search relevance: 1.00 | Views last month: 18 | Catalog Last Checked: August 01, 2026 at 05:18 AM -
Nitrogen, phosphorus, and suspended-sediment loads, and changes in loads, in rivers across the Chesapeake Bay watershed have been calculated using monitoring data from the Chesapeake Bay Nontidal...
Search relevance: 1.00 | Views last month: 17 | Catalog Last Checked: August 01, 2026 at 04:17 AM -
These map layers present the number of National Green Building Standard points awarded for a project site or lot’s relative walkability, and accessibility to jobs via transit or within a 45-minute...
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This metadata record documents 3 sets of comma delimited tables representing the amount of reported best management practice (BMP) implementation within the Chesapeake Bay watershed as well as...
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This web service layer, Ozone 8-hr (2015 standard), displays identified state level areas where ground-level ozone have not met the National Ambient Air Quality Standards (NAAQS) established in...
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This metadata record documents 2 comma delimited tables representing output from the Chesapeake Bay Program Phase 5.3.2 Watershed Model. The effect of best management practices (BMP) in 2014 in...
Search relevance: 1.00 | Views last month: 10 | Catalog Last Checked: August 01, 2026 at 03:56 AM -
This data set is an ArcGIS shapefile depicting land segments in the Chesapeake Bay Watershed and adjacent states of New York, Pennsylvania, Maryland, West Virginia, Delaware, Virginia, North...
Search relevance: 1.00 | Views last month: 8 | Catalog Last Checked: August 01, 2026 at 05:54 AM -
Nitrogen, phosphorus, and suspended-sediment loads, and changes in loads, in major rivers across the Chesapeake Bay watershed have been calculated using monitoring data from the Chesapeake Bay...
Search relevance: 1.00 | Views last month: 6 | Catalog Last Checked: August 01, 2026 at 05:11 AM -
This metadata record documents data files, an analysis script, and results from a land-surface greenness analysis of the Tuckahoe Creek watershed, covering parts of Caroline, Queen Anne's and...
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Nitrogen, phosphorus, and suspended-sediment loads, and changes in loads, in major rivers across the Chesapeake Bay watershed were calculated using monitoring data from the Chesapeake Bay River...
Search relevance: 1.00 | Views last month: 6 | Catalog Last Checked: August 01, 2026 at 05:43 AM -
This web service contains the following state level layers:Ozone 8-hr (1997 standard), Ozone 8-hr (2008 standard), Lead (2008 standard), SO2 1-hr (2010 standard), PM2.5 24hr (2006 standard), PM2.5...
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The dataset contains locations and attributes of HUC-11 watersheds. The USGS presents a detailed explanation of HUCs at https://water.usgs.gov/GIS/huc.html. HUC-11 boundaries are compiled by each...
Search relevance: 1.00 | Views last month: 6 | Catalog Last Checked: August 03, 2026 at 02:37 AM -
Reactive nitrogen is transported from the atmosphere to the landscape as wet and dry deposition that contributes to annual nitrogen loads to the Chesapeake Bay. Estimates of atmospheric inorganic...
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This data release presents chemical results from investigations of surface-water quality in the Potomac River watershed (encompassing Washington, D.C. and parts of West Virginia, Virginia,...
Search relevance: 1.00 | Views last month: 5 | Catalog Last Checked: August 01, 2026 at 05:57 AM -
Nitrogen, phosphorus, and suspended-sediment loads, and changes in loads, in major rivers across the Chesapeake Bay watershed have been calculated using monitoring data from the Chesapeake Bay...
Search relevance: 1.00 | Views last month: 5 | Catalog Last Checked: August 01, 2026 at 06:18 AM -
This EnviroAtlas web service supports research and online mapping activities related to EnviroAtlas (https://www.epa.gov/enviroatlas). This web service includes layers depicting EnviroAtlas...
Search relevance: 1.00 | Views last month: 5 | Catalog Last Checked: August 03, 2026 at 04:23 AM -
This metadata record documents 8 comma delimitated files that support the USGS Scientific Investigations Report 2018-5020 on field studies in the Bucks Branch watershed and the Andover Branch...
Search relevance: 1.00 | Views last month: 5 | Catalog Last Checked: August 01, 2026 at 04:56 AM
