Sea Lake and Overland Surges from Hurricanes (SLOSH) Maps

To display inundation or inundation depths for different hurricane categories, use the Layers menu widget in the upper right of the map window.
Use the About widget in the upper right (small i) to show the different legends for the layers in the map.

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Data Description and Usage

This dataset displays areas along the Maine coast that would potentially be inundated due to Category 1, 2, 3, or 4 hurricanes at mean high tide. Areas of inundation shown are expected to be below the overall storm tide, which is a combination of predicted astronomical tide and storm surge. Additional layers show potential inundation depths associated with the different events. These data were produced using the Sea, Lake, and Overland Surges from Hurricanes, or SLOSH, model. Data is meant to support emergency and evacuation planning purposes.

Data Disclaimer

Usage of this data is limited to general and emergency planning purposes. Users must assume responsibility in determining the usability of this data for their purposes. It is important to note that LiDAR data used to create these data represents bare earth conditions at the time it was captured (2006, 2010, and 2011) and thus, topography may have undergone changes since initial mapping occurred. It is also important to note that these datasets only account for combined predicted astronomical tides and potential storm surges from the SLOSH model, and thus do not account for the additional impacts of waves, precipitation, or freshwater flow. Neither the Maine Geological Survey nor the Department of Agriculture, Conservation and Forestry, nor its employees or agents: (1) make any warranty, either expressed or implied for merchantability or fitness for a particular purpose, as to the accuracy or reliability of the information shown on the map; nor are they (2) liable for any damages, including consequential damages, from using the map or the inability to use the map.

Frequently Asked Questions

The frequently asked questions provide more information about how the data layers were created, what they should be used for, usage limitations and general information on hurricanes in Maine.

Data Download

The SLOSH inundation and inundation depths layers can be downloaded as zipped shapefiles for each county for use in any GIS software to perform further spatial analysis.

CountyInundationInundation Depths
Cumberlandshapefile (ZIP 12.5MB)shapefile (ZIP 53.5MB)
Hancockshapefile (ZIP 17.0MB)shapefile (ZIP 67.6MB)
Kennebecshapefile (ZIP 0.7MB)shapefile (ZIP 2.7MB)
Knoxshapefile (ZIP 11.8MB)shapefile (ZIP 41.2MB)
Lincolnshapefile (ZIP 10.5MB)shapefile (ZIP 35.8MB)
Penobscotshapefile (ZIP 0.9MB)shapefile (ZIP 3.6MB)
Sagadahocshapefile (ZIP 8.8MB)shapefile (ZIP 35.5MB)
Waldoshapefile (ZIP 2.9MB)shapefile (ZIP 12.0MB)
Washingtonshapefile (ZIP 20.9MB)shapefile (ZIP 61.3MB)
Yorkshapefile (ZIP 6.9MB)shapefile (ZIP 29.7MB)


    Recommended citations for the project, web application, and datasets:

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