29 Martin's Reef (MI 38)
latitude 45º 54' 47.3" N
longitude 84º 8' 55.2" W
September 2, 2003

Physically a duplicate of Poe's reef (see above), this light marks the corner for the boats going into the Dolomite mines on the Upper Peninsula.  When you see, it you say "what the big deal?"  Looking at the charts, it's clear why it's here.

Click on the photo for more detail. Note that the water's so still you can see the reflection of the tower.