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 -
Pursuant to Section 7-100l of the Connecticut General Statutes, each municipality is required to transmit a digital parcel file and an accompanying assessor’s database file (known as a CAMA...
Search relevance: 1.00 | Views last month: 74 | Catalog Last Checked: November 03, 2026 at 11:27 PM -
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 Release Inventory...
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These unprojected (geographic coordinates) 3-Zone Average Annual Salinity Digital Geographies are based on analysis of long-term salinity data for 147 estuaries of the contiguous United States....
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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 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: 37 | Catalog Last Checked: October 14, 2026 at 05:12 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 Risk Management Plan...
Search relevance: 1.00 | Views last month: 35 | Catalog Last Checked: November 08, 2026 at 02:09 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 Risk Management Plan...
Search relevance: 1.00 | Views last month: 34 | Catalog Last Checked: November 08, 2026 at 02:09 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...
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...
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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: 28 | Catalog Last Checked: November 08, 2026 at 02:09 AM -
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...
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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 -
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
