Traveling around the Great Lakes State I visit a lot of historic and iconic places and landmarks. On occasion, I come across these round disks about 4 inches in diameter. They are survey markers placed by government agencies such as USGS, the Coast Guard, or NOAA. The markers, also called benchmarks, have the name of the location, a number, and some other information engraved into them. I have found them near lighthouses like this one at the Marquette Lighthouse. I am no expert in them but I believe they are used by surveyors as a reference point. It is one of those things that after you find a few of them you start noticing them more and more. Like the one in the Sacred Rock ( click HERE ) I also found a marker at the summit of Bundy Hill. ( you can see my post HERE)
I enjoy finding these survey markers by happenstance, but if you want to go out and look for survey markers you can find their location on this website HERE
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