Blue Plan Map Viewer


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 Long Island Sound Blue Plan process included (1) gathering data to develop an inventory of ecological resources and human uses and producing corresponding maps that were reviewed by experts and stakeholders for relevance and accuracy and (2) development of Blue Plan policy to be implemented though existing State permit processes that will minimize conflict with natural resources and traditional uses.


The Blue Plan Map Viewer contains all data layers for the project in a format for exploration.

Study Area

The Blue Plan legislation established two distinct areas of the Sound, one considered a “planning area” and the other a “policy implementation area.” The area within which Blue Plan policies and standards would apply is the area located “seaward of the bathymetric contour of minus ten feet NAVD to the state’s waterward boundaries with the states of New York and Rhode Island.” This policy area also extends into the rivers that flow into the Sound up to the first motor vehicle bridge or railroad bridge. The area considered for planning purposes was more inclusive and comprehensive, allowing for consideration of nearshore areas at the Mean High Water Line and, in some cases, upland areas connected in some way to offshore areas.


These map layers are based on (and limited to) available data. Within any map there may be areas of LIS that have not been assessed because of limited data.

Layers comprising “Ecologically Significant Areas” (ESAs) and “Significant Human Use Areas”(SHUAs) do not by themselves represent a full description of the Long Island Sound ecosystem or human uses. Rather, while ESAs and SHUAs call attention to priority areas, the Sound’s overall ecological integrity and the ways in which people use the Sound remains important. By recognizing an area as an ESA or SHUA does NOT mean non-ESA or non-SHUA areas are unimportant.

Reasonable attempts have been made to ensure that this data and documentation is accurate and reliable; however neither the Connecticut Department of Energy and Environmental Protection, nor its partners assumes liability for any damages caused by inaccuracies in this data or documentation, or as a result of the failure of the data or software to function in a particular manner. The Connecticut Department of Energy and Environmental Protection and the University of Connecticut make no warranty, expressed or implied, as to the accuracy, completeness, or utility of this information, nor does the fact of distribution constitute a warranty.