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Portsmouth Harbor Lighthouse is a historic lighthouse located within Fort Constitution in New Castle, New Hampshire,.

Location: Portsmouth Harbor, Piscataqua River, New Castle, New Hampshire
Coordinates: 43°4′15.7″N 70°42′30.9″W
Constructed: 1771-original tower-1878-current tower
Construction: Cast-iron & Brick
Automated: 1960
Height: 48-foot (15 m)
Shape: Conical
First lit: 1878
Focal height: 16 m (52 ft)
Lens: Fourth order Fresnel, 1854
Range: 12 nautical miles (22 km; 14 mi)
Characteristic: Fixed Green

I saw this light on July 14 2022.

The lighthouse is owned by the Coast Guard and leased to Friends of Portsmouth Harbor Lighthouses a chapter of the American Lighthouse Foundation. Grounds/tower open during open houses, dwelling closed.

Added to the National Register of Historic Places on October 8 2009

Access: Car. Park in the Fort Constitution parking lot and walk to the fort from where you can get a good view of the lighthouse. The fort was closed on the day I was there so I saw this from a distance.