Coastal Sand Dune Geology 1:4,800-scale Maps Digital Data

Maine's coastal beaches and dune are constantly changing. Erosion or accretion can reshape the beach and dunes over time so remapping is needed for resource protection and coastal development. Original Coastal Sand Dune Geology Maps, created in 2006, used 2003 aerial photography, 2004 LiDAR, and field work to delineate Coastal Sand Dune and Erosion Hazard Area (EHA) boundaries. From 2015 to 2021, MGS updated these boundaries and mapped new coastal sand dunes and erosion hazard areas in York, Cumberland, and Sagadahoc Counties. This was done using newer aerial imagery, newer LiDAR data, and additional field work. Updated digital data representing these boundaries is available for download, below, and are visualized in the Web Map below. Coastal sand dune boundaries and erosion hazard areas presented in the Web Map should be used for permitting pursuant to the Coastal Sand Dune Rules (Chapter 355) and supersede the original Coastal Sand Dune Geology Maps. In addition, MGS mapped new coastal sand dune boundaries and erosion hazard areas for the remaining communities in Lincoln, Waldo, Hancock and Washington counties. Mapping in these areas should be considered provisional, and are presented as best-available information. The original Coastal Sand Dune Geology Maps are still available for download at the bottom of the page.

Web Map


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Digital Data

Online Maps