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Butler Flats Light is a sparkplug lighthouse located in the outer harbor of New Bedford, Massachusetts, at the mouth of the Acushnet River. Built in 1898 by the United States Lighthouse Board, it is the only known caisson lighthouse designed by a marine architect.

Location: New Bedford Channel, Acushnet River, New Bedford, Massachusetts
Coordinates: 41°36′13.5″N 70°53′40″W
Constructed: 1898
Foundation: Cast iron/Concrete Caisson
Construction: Brick
Tower shape: Conical on cylindrical base
Markings: White tower with black base and lantern
First lit: 1898
Automated: 1978
Deactivated: 2014
Focal height: 53 feet (16 m)
Lens: Fifth order Fresnel lens
Characteristic: Flashing white 4s.

I was here on August 18 2021, Saw it again on July 12 2022

The lighthouse is privately owned. Tower closed.

Added to the National Register of Historic Places on June 15 1987

Access: Car : You can get a decent view from land on East Rodney French Blvd. There is also a pier in Fort Taber Park from which you can get a good view