Highest Annual Tide (HAT) Levels for Year 2018 Maine Coast - DEPLW-HAT 1/2018

Oct 13, 2026

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Highest Annual Tide (HAT) level values for 2018 are listed for Maine’s coast from Eastport to Kittery, organized by coastal location and two reference datums: HAT (MLLW) and HAT (NAVD88), including the corresponding tide-table and elevation values in feet. Notes explain the regulatory use of HAT elevations for locating the upland edge of coastal wetlands under Maine’s Natural Resources Protection Act and Mandatory Shoreland Zoning Act.

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Maine DEP Highest Annual Tide (HAT) Levels for Year 2018 Maine Coast from Eastport to Kittery Location HAT (MLLW) HAT (NAVD88) (Tide Table-feet) (elev. feet) Station Name: Pettegrove Point, Dochet Island EASTPORT Garnet Point, Pennemquan River Coffins Point Birch Islands Gravelly Point, Whiting Bay Cutler, Little River Cutler Naval Base Stone Island, Machias Bay Machiasport, Machias River Shoppee Point, Englishman Bay Steele Harbor Island Milbridge, Narraguagus River Green Island, Petit Manan Bar Prospect Harbor BAR HARBOR Southwest Harbor Bass Harbor Winter Harbor, Frenchman Bay Blue Hill Harbor Mackerel Cove Ellsworth, Union River Burnt Coat Harbor, Swans Island Center Harbor Little Deer Isle Isle Au Haut Oceanville, Deer Isle Stonington, Deer Isle Matinicus Harbor, Wheaton Island Vinalhaven, Vinalhaven Island North Haven Castine Pulpit Harbor, North Haven Island Fort Point Gross Point, Eastern Channel Bucksport Winterport Sandy Point Bangor Belfast Rockland Tenants Harbor Monhegan Island Burnt Island, Georges Islands Port Clyde 23.4 22.6 23.5 20.9 21.2 20.5 17.1 16.0 15.4 15.6 14.9 15.0 14.1 13.7 13.6 13.5 12.9 12.5 12.8 12.8 12.7 13.6 12.0 12.8 12.7 11.7 12.6 12.3 11.5 11.7 12.3 12.8 13.0 13.4 13.4 13.6 15.0 13.4 16.5 13.1 12.8 12.0 11.4 11.6 11.6 13.1 12.7 14.4 12.3 12.7 11.4 9.4 9.3 8.3 8.5 7.6 7.9 7.8 7.2 7.2 7.5 6.7 6.4 6.6 6.9 6.7 7.8 6.2 6.9 6.8 5.9 7.0 6.6 5.8 6.0 6.5 6.9 7.2 7.5 7.3 7.4 8.6 7.4 10.0 7.3 7.1 6.4 6.0 6.2 6.2 Maine DEP Highest Annual Tide (HAT) Levels for Year 2018 Maine Coast from Eastport to Kittery Location HAT (MLLW) HAT (NAVD88) (Tide Table-feet) (elev. feet) Otis Cove Thomaston New Harbor, Muscongus Bay Muscongus Harbor, Muscongus Sound Friendship Harbor Pemaquid Harbor, Johns Bay Jones Neck Waldoboro East Boothbay Walpole Newcastle Damariscove Harbor, Damariscove Islan Boothbay Harbor Southport, Townsend Gut Isle of Springs Cross River entrance Wiscasset Sheepscot (below rapids) Back River Robinhood, Sasanoa River Mill Point, Sasanoa River Hunniwell Point Phippsburg Bath Sturgeon Island, Merrymeeting Bay Androscoggin River entrance Brunswick, Androscoggin River Bowdoinham, Cathance River Cundy Harbor, New Meadows River Howard Point, New Meadows River South Harpswell, Potts Harbor Wilson Cove, Middle Bay South Freeport Prince Point Doyle Point Falmouth Foreside Great Chebeague Island Cliff Island, Luckse Sound Vaill Island Long Island Cow Island Presumpscot River Bridge Back Cove Great Diamond Island Peak Island Cushing Island PORTLAND Fore River Portland Head Light 11.8 11.8 11.4 11.7 11.7 11.4 11.8 12.3 11.6 12.0 12.0 11.4 11.4 11.6 11.6 11.8 12.2 12.4 11.8 11.4 11.4 11.3 10.4 9.2 6.8 6.1 5.0 7.4 11.6 11.7 11.6 11.8 11.7 11.8 11.8 11.8 11.8 11.8 11.6 11.8 11.8 11.9 11.4 11.8 11.7 11.7 11.8 11.8 11.4 6.7 7.3 6.0 6.3 6.3 5.9 6.3 6.8 6.1 6.2 6.1 6.1 6.1 6.4 6.4 6.6 6.7 6.9 6.3 6.2 6.2 6.5 5.8 4.8 2.4 1.4 0.3 2.9 6.5 6.5 6.5 6.5 6.5 6.7 6.7 6.7 6.7 6.7 6.6 6.7 6.7 6.7 6.2 6.7 6.6 6.6 6.5 6.5 6.4 Maine DEP Highest Annual Tide (HAT) Levels for Year 2018 Maine Coast from Eastport to Kittery Location HAT (MLLW) HAT (NAVD88) (Tide Table-feet) (elev. feet) Pine Point Old Orchard Beach Camp Ellis, Saco River Entrance Biddeford, Saco River Cape Porpoise Kennebunkport Wells Cape Neddick York Harbor Fort Point, York Harbor Seapoint, Cutts Island Jaffrey Point Gerrish Island Fort Point Kittery Point Seavey Island Portsmouth Dover Point Salmon Falls River 11.4 11.4 11.6 12.6 11.2 11.8 11.5 11.2

FAQs

What do HAT (MLLW) and HAT (NAVD88) represent in this table?

The document provides Highest Annual Tide elevations referenced to Mean Lower Low Water (MLLW) and a converted elevation reference to NAVD88, with values listed in feet.

How are the HAT elevations intended to be used?

They may be used to survey the upland edge of coastal wetlands for regulatory purposes under both the Natural Resources Protection Act and the Mandatory Shoreland Zoning Act.

Where do the tidal station elevations come from and how are they converted?

Elevations referenced to MLLW are taken from NOAA tide station data, then compiled and converted to NAVD88 using NOAA VDatum (v. 3.4) software by the Maine Geological Survey.

Oct 13, 2026

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