30 DeTour Reef (MI 37) latitude 45° 56' 56.8" N longitude 83° 54' 11.9" W September 8, 2009 A significant light marking the entrance to the St. Mary's river. Last time, we were in full fog. This time it was beautiful (as you can see). Tours of the light are available from the village of DeTour. ARLHS # USA-226
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