Egg Rock Light is located on Egg Rock, near Winter Harbor. The station was established in 1875. The current tower (40 feet tall, 64 foot high focal plane) was built in 1875. The original optic was a 5th-order Fresnel, but now is VRB-25. The lighthouse flashes red every 5 seconds and the fog signal sounds two blasts every 30 seconds. It was automated in 1976. The lighthouse is an active aid to U. S. Coast Guard navigation. It is part of the Maine Coastal Islands Wildlife Refuge and maintained by the U. S. Fish and Wildlife Service.

The lighthouse (1875), keeper's house (1875), fog signal building (1904), oil house, boathouse, and generator house are still standing.