Natural Resource Information and Imagery
for Planning, Management, Education and Research

  • water
  • soils
  • aerials
  • geology
  • elevation
  • habitat
  • open space
  • contours
  • natural resources
  • watersheds


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Map Viewers

view and explore maps

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Map Catalog

printable static pdf maps by town

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Map Services

connect to data with GIS software

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information about map layers

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where to download GIS files

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FAQs, instructions and tips


IMPROVEMENT Open Space in the Advanced Viewer now has a transparency slider.
NEW 2017 imagery for the East Coast of CT, North Fork of Long Island and a small piece of the southwest RI coast.
Update The Advanced Viewer and the Coastal Hazards Viewer are back!
NEW Connecticut MS4 layers and viewer including statewide impervious surface layers for viewing and download.
Update The Download Manager instructions for multiple 2016 image and elevation tile download have been updated.
NEW Contours from the 2016 lidar available for download. Map service coming soon.


The Sea Level Rise Effects on Roads and Large Marshes. To better understand how Connecticut’s coastal area marshes and roads may respond to sea level rise (SLR), Sea Level Affecting Marshes Model (SLAMM) was applied to Connecticut’s shoreline by Warren Pinnacle Consulting, Inc. This viewer displays the model’s results for Connecticut’s 21 largest marshes and all coastal area roads.
A 2019 flight is in the works! The end result will be statewide, 6 inch, 4 band, tidal coordinated aerial imagery for Connecticut. Read more.
A viewer for the Long Island Sound Blue Plan is now part of CT ECO. The purpose of the Long Island Sound Blue Plan is to identify and protect places of traditional use and ecological significance, and to minimize conflicts, now and in the future. This includes preserving a collective vision of Long Island Sound, and facilitating a transparent, science-based decision-making process. The Blue Plan Map Viewer contains data layers for the plan in a format for exploration.
A new CT ECO Survey is actively collecting information about the value of CT ECO to different people for different uses in Connecticut. Please take a few minutes and fill out the survey (multiple times if you use CT ECO in multiple capacities) and share with other CT ECO Users. Thank you in advance!
The newly designed and updated Advanced Viewer is now online including help! The viewer contains loads of layers that can be combined in many different combinations along with advanced tools such as query, filter, identify all, drawing and locate me. Check it out!
A lot of changes have been made to the lidar-based elevation on CT ECO. First, seamless 2016 layers are now in the Elevation Viewer. Second, all lidar datasets with DEMs are available as image services with raster functions. The new Elevation Interact ArcGIS Online map includes all image services with raster functions. Finally, all help and instructional pages have been updated to reflect the updates.

CT ECO Webinar posted on the CLEAR website.

About this website

Connecticut Environmental Conditions Online (CT ECO) is the collaborative work of the Connecticut Department of Energy and Environmental Protection (DEEP) and the University of Connecticut Center for Land Use Education and Research (CLEAR) to share environmental and natural resource information with the general public. CT ECO's mission is to encourage, support, and promote informed land use and development decisions in Connecticut by providing local, state and federal agencies, and the general public with convenient access to the most up-to-date and complete natural resource information available statewide.

CT ECO includes a variety of online maps and tools for viewing Connecticut’s environmental and natural resources such as protected open space, farmland soils, wetland soils, aquifer protection areas, water quality classifications, and drainage basins. Each can be viewed separately or in conjunction with other environmental and natural resource information. In addition, CT ECO includes several dates of high resolution orthophotography as well as statewide elevation data..



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