Search datasets
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The Geographic Names Information System (GNIS) is the Federal standard for geographic nomenclature. The U.S. Geological Survey developed the GNIS for the U.S. Board on Geographic Names, a Federal...
Search relevance: 1.00 | Views last month: 93 | Catalog Last Checked: September 10, 2026 at 09:50 PM -
This dataset shows the temporal frequency and spatial extent of cyanobacteria cells in large, freshwater lakes and reservoirs across the continental United States derived from 300x300 meter MEdium...
Search relevance: 1.00 | Views last month: 89 | Catalog Last Checked: August 03, 2026 at 04:16 AM -
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 feature service contains location and facility identification information from EPA's Facility Registry System (FRS) for the subset of facilities that link to the Toxic Substances Control...
Search relevance: 1.00 | Views last month: 45 | Catalog Last Checked: September 12, 2026 at 07:30 PM -
This dataset, termed "GAGES II", an acronym for Geospatial Attributes of Gages for Evaluating Streamflow, version II, provides geospatial data and classifications for 9,322 stream gages...
Search relevance: 1.00 | Views last month: 41 | Catalog Last Checked: September 10, 2026 at 08:16 PM -
Contours are lines of equal elevation. This is a contour feature layer for the state of Connecticut derived from the index contour in the 1' contour data set. All closed polygons less than 35'...
Search relevance: 1.00 | Views last month: 39 | Catalog Last Checked: September 10, 2026 at 06:41 PM -
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...
Search relevance: 1.00 | Views last month: 32 | Catalog Last Checked: August 03, 2026 at 04:45 AM -
SEER Limited-Use cancer incidence data with associated population data. Geographic areas available are county and SEER registry. The Surveillance, Epidemiology, and End Results (SEER) Program of...
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This feature layer represents the boundaries of Connecticut's Senate districts based on the latest redistricting process following the 2020 Census. More information about the 2021 Redistricting...
Search relevance: 1.00 | Views last month: 28 | Catalog Last Checked: September 10, 2026 at 06:40 PM -
This GIS dataset contains points which depict air quality monitors within EPA's Air Quality System (AQS) monitoring network. This dataset is updated weekly to reflect the most recent changes in...
Search relevance: 1.00 | Views last month: 27 | Catalog Last Checked: August 03, 2026 at 04:43 AM -
The USGS compiles online access to water-resources data collected at approximately 1.5 million sites in all 50 States, the District of Columbia, Puerto Rico, the Virgin Islands, Guam, American...
Search relevance: 1.00 | Views last month: 26 | Catalog Last Checked: September 10, 2026 at 10:50 PM -
National watershed boundary (HUC12) dataset for the conterminous United States, retrieved 10/26/2020
This child item provides a snapshot of the watershed boundary dataset which consists of a shapefile with 87,020 12-digit hydrologic unit codes (HUC12) for the conterminous United States retrieved...
Search relevance: 1.00 | Views last month: 24 | Catalog Last Checked: September 10, 2026 at 09:09 PM -
This dataset contains mining claim cases with the case disposition (status) of closed from US Bureau of Land Management's, BLM, Mineral and Land Record System(MLRS). The BLM only requires that...
Search relevance: 1.00 | Views last month: 23 | Catalog Last Checked: September 10, 2026 at 06:22 PM -
Contours are lines of equal elevation. This is a contour feature layer for the state of Connecticut derived from the index contour in the 1' contour data set. All closed polygons less than 35'...
Search relevance: 1.00 | Views last month: 21 | Catalog Last Checked: September 10, 2026 at 06:42 PM -
This sediment database contains location, description, and texture of samples taken by numerous marine sampling programs. Most of the samples are from the Atlantic Continental Margin of the...
Search relevance: 1.00 | Views last month: 20 | Catalog Last Checked: September 10, 2026 at 08:57 PM -
This EnviroAtlas web service supports research and online mapping activities related to EnviroAtlas (https://www.epa.gov/enviroatlas). This EnviroAtlas dataset describes the percentage of a 15-m...
Search relevance: 1.00 | Views last month: 20 | Catalog Last Checked: May 06, 2026 at 12:20 AM -
CPARD contains (1) EPA-approved State, Tribal and Federal certification plans required by the Federal Insecticide, Fungicide, Rodenticide Act to administer a certification program for applicators...
Search relevance: 1.00 | Views last month: 17 | Catalog Last Checked: September 10, 2026 at 07:10 PM -
This feature layer contains contact and location information for Municipal Veterans Representatives across Connecticut, as designated under Connecticut General Statutes §27-135. Each record...
Search relevance: 1.00 | Views last month: 17 | Catalog Last Checked: September 10, 2026 at 06:39 PM -
Contours are lines of equal elevation. This is a contour feature layer for the state of Connecticut derived from the index contour in the 1' contour data set. All closed polygons less than 35'...
Search relevance: 1.00 | Views last month: 17 | Catalog Last Checked: September 10, 2026 at 06:39 PM -
This map layer contains the shallowest principal aquifers of the conterminous United States, Hawaii, Puerto Rico, and the U.S. Virgin Islands, portrayed as polygons. The map layer was developed...
Search relevance: 1.00 | Views last month: 16 | Catalog Last Checked: September 10, 2026 at 08:34 PM
