This cache is located on one of the two range light structures that guide ships into the St. Clair River under the Blue Water Bridges. What a view in all directions. This navigation marker has been integrated in the river walk so that you can enjoy the scenery from the elevated area at the base of the light.
Cords should get you close enough.
Gur pnpur vf n anab gung vf snfgrarq qbja jryy.