I searched for "dangerous reef" & lighthouse and this one came up first. I had previously mentioned it in this post about the Fourteen Foot Shoal lighthouse, because that one (Fourteen Foot) was operated from this one, Poe Reef.
First, about the dangerousness. The Lighthouse Friends page about it says this: "From the southeast point of Bois Blanc Island, a spit covered with fifteen feet of water extends a mile into Lake Huron, and five-eighths of a mile beyond this spit lies dangerous Poe Reef, a detached shoal, with a least depth of just twelve feet."
OK, so it is dangerous. Thus and therefore, it has a lighthouse. Apparently the lighthouse is now in private hands, as it was auctioned off, but it has a decent history. (Still, if the shoal used to be dangerous, is it not dangerous anymore?)
So now from the Lighthouse Directory, the information below. A link to Google Maps to show where it is at the end of the text.
"1929 (lightship station established 1892). Active; focal plane 71 ft (21.5 m); white light, 1 s on, 1 s off. 60 ft (18 m) square cylindrical reinforced concrete tower with lantern and gallery, incorporating 3-story keeper's house and a fourth-floor watch room; solar-powered 375 mm lens. The tower is painted black with a broad white band encompassing two floors. ... In July 2017 the station was placed on auction sale by the General Services Administration, and in September it sold for $112,111. This sale failed to close when the high bidder defaulted, so the lighthouse was back on the auction block in 2019, selling in September for $97,000. The new owner has not been identified. Located on a shoal off Bois Blanc Island on the north side of the eastern entrance to South Channel about 6 miles (10 km) northeast of Cheboygan."
Four pictures of this one: