First lit in 1838 with oil lamps and reflectors this light happens to be atop a large cliff (80’+/-) and lies at a tight little passage where Isle Au Haut Bay meets East Penobscot Bay. The tidal current really hums between Eagle and the largely inaccessible Hardhead I. It wasn’t until 1858 that a fourth order Fresnel lens was installed in the lantern atop the rubble stone tower. Today the light flashes white every 4 seconds with a luminous range of 9 miles.
Keeper Howard Ball, an Audubon warden, who served the light from 1898 to 1913 is quoted twice in the 1909 ornithological journal The Auk: