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CTDOT Office of the State Traffic Administration (OSTA) Interactive Map
Web Mapping Application containing all layers from the Office of the State Traffic Administration that enables the user to visually review, search, and query OSTA data,... -
Lake Bathymetry Contours Lines
See full Data Guide here. Lake Bathymetry describes the water depth for selected reservoirs, lakes, ponds, and coves in Connecticut. It includes depth contours, also called... -
CTDOT Roadway Basemap
A custom basemap created for internal Connecticut Department of Transportation in web apps and maps.The basemap represents the most recent and active Public Road Network as... -
CT Congressional Districts
This feature layer represents the boundaries of Connecticut's congressional districts based on the latest redistricting process following the 2020 Census. More information about... -
Soils Farmland Classification
Farmland classification identifies map units as prime farmland, farmland of statewide importance, farmland of local importance, or unique farmland. It identifies the location... -
Impaired 2006 River Lake Estuary Set
Connecticut 303(d) Impaired Waters 2006 is a subset of Connecticut 305(b) Assessed Waters 2006. If any one of the assigned designated uses is categorized as NOT Supporting, the... -
Connecticut State Parcel Layer 2023
The dataset has combined the Parcels and Computer-Assisted Mass Appraisal (CAMA) data for 2023 into a single dataset. This dataset is designed to make it easier for stakeholders... -
Coastal Area Polygon
Coastal Area & Boundary Polygon: The Coastal Area layer is a 1:24,000-scale, polygon feature-based layer that includes the land and waters that lie within the Coastal Area... -
Environmental Justice Block Groups 2024
Environmental Justice 2025 Set is comprised of two layers: Environmental Justice Block Groups 2024 and Environmental Justice Distressed Municipality 2025. All Census and ACS... -
Trail Roadway
DEEP Trails Set: Trail Access Points are point features in the Statewide Trails Database that describe where trails are accessed at trail heads, state and municipal parks and... -
Impaired 2008 River Lake Estuary Set
Connecticut 303(d) Impaired Waters 2008 is a subset of Connecticut 305(b) Assessed Waters 2008. If any one of the assigned designated uses is categorized as NOT Supporting, the... -
Local Emergency Planning Committees (LEPC)
In May 1987, pursuant to Section 22a-601(b) of the Connecticut General Statutes (CGS), the State Emergency Response Commission (SERC) designated local planning districts by... -
Broadband Data by Tract - 2023
This feature layer provides all OPM collected data at the tract level.------The Connecticut Broadband Availability and Adoption Maps were created to help citizens and... -
Coastal Boundary Polygon
Coastal Area & Boundary Polygon: The Coastal Area layer is a 1:24,000-scale, polygon feature-based layer that includes the land and waters that lie within the Coastal Area... -
Routing Segments
A custom basemap created for internal Connecticut Department of Transportation in web apps and maps.The basemap represents the most recent and active Public Road Network as... -
Connecticut Housing Data Hub
The Connecticut Housing Data Hub is a public resource developed by the Office of Policy and Management (OPM), Department of Housing (DOH), and Department of Economic and... -
305b Assessed 2020 River, Lake, Estuary 2020 Set
305b Assessed River, Lake, Estuary 2020: Connecticut 305b Assessed River 2020 is a 1:24,000-scale, line feature-based layer that includes rivers that have been assessed to... -
National Register District
The boundaries of the district polygons are both modified and unmodified pre-existing polygons provided by NPS and SHPO, as well as new, previously unmapped districts. For the... -
Quaternary Geology LIS Lacustrine Fan Deposits
Connecticut Quaternary Geology Long Island Submerged Marine Fluvial-Estuarine, Channel-Fill Deposits identifies early postglacial, channel-fill deposits submerged in Long Island... -
HUC Watershed Line
This data set is a digital hydrologic unit boundary layer that is at the Subwatershed (12-digit) level. The original data set was developed by delineating the boundary lines on...
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