Welcome to Seavey Island, NH

Seavey Island sits on the north side of Portsmouth Harbor. The debate over whether it is located in Maine or New Hampshire has gone on for generations, though court rulings have put the island in Maine.

Several U.S. Navy activities, including the Portsmouth Naval Shipyard and a regional medical clinic, are on Seavey Island.

For the nearest harbor info and local resources, visit the Portsmouth Harbor or Kittery Point Harbor Guides.

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Featured Local Businesses

Marine Supplies

Hamilton Marine - Kittery, ME
An aerial view of Safe Harbor Kittery Point

Safe Harbor Kittery Point
Maritime Boats by Chislett Marine

Maritime Boats
Great Bay Marine

Great Bay Marine

Boating Resources for Seavey Island, NH

Important Contacts

Harbormaster in Seavey Island, NH

Local Coast Guard Station

Charts, Navigation, & Guides

Online Nautical Chart for Seavey Island, NH

Pilot Guide Info for Seavey Island, NH

Important Locations & Services

Local Marinas

Weather Conditions & Forecasts

Check Tides in Seavey Island, NH

Marine Weather

Print a Tide Chart for Seavey Island, NH

Other Resources

Get a Fishing License in New Hampshire

Register Your Boat in New Hampshire

Coastal News Updates See All

Image Credits: Flickr.com.

Remarkably Bright Creatures: A Story of Octopus Intelligence Set in the Pacific Northwest

6/9/2026

By Janet Green Hammerman, best4boats.com. The Netflix adaptation of Shelby Van Pelt’s bestselling novel Remarkably Bright Creatures is drawing renewed attention to one of the ocean’s most fascinating inhabitants — the giant Pacific octopus. Set in a fictional Pacific Northwest coastal town, the story follows an aging widow, a drifting… SEE MORE

Physician Dr. Larry Spetka swims with his namesake, Larry the whale shark, in the Gulf in May 2025. Credit: BWRI/Jamison Smith

A Year in the Life of Larry the Whale Shark

6/8/2026

By fisheries.noaa.gov, fisheries.noaa.gov. One year ago today, researchers deployed a satellite tag on a whale shark off the coast of Tampa Bay, Florida. They never could have anticipated the epic journey that would ensue. On May 28, 2025, researchers set out from Boca Ciega Bay, Florida, heading into the Gulf… SEE MORE

This image is of a salt marsh in coastal Maine. The high-resolution, land cover mapping NOAA has done for the state captures the tidal creeks, pannes, pools and vegetation with far greater precision and detail than past, 30-meter mapping. (Image credit: NOAA)

The Coast Is Clear-er: NOAA Unveils New Land Cover Maps 900 Times Greater In Detail

6/7/2026

By noaa.gov, noaa.gov. NOAA is releasing new, higher-resolution land cover maps for coastal Alabama, Mississippi, Northeastern Ohio, Rhode Island, and the Puget Sound in Washington. The data will be made available through the Digital Coast website and will provide these communities with better information for decisions related to stormwater management, water quality… SEE MORE

Photo Credits

New Hamshire Seacoast - Image by Chinem McCollum from Pixabay