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What is it?

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I can't specifically identify it, but I'd say it is definitely a horizontal control point set by someone. It could be the agencies involved at Argonne Laboratory, the county, the state highway department since is close to a road, or even the railroad.

 

I'd think from the picture it was concrete, not stone as it says in the Waymarking description.

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I changed the descr to concrete. I don't know why I thought it was stone. Argonne used to be located in these woods about a half mile SSW.

 

Brendan

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It is most likely a right-of-way marker for the adjacent road/highway. The State of California DOT used similar concrete posts as right-of-way markers in the first part of the 1900's. They began to transition to underground monuments (pipes & 'T' bars) in the 40's & 50's.

 

Similar markers were also used in my area as County Line markers. This is a marker on the County Line between Fresno & Tulare Counties in California.

 

25945_1900.JPG

25945_2000.JPG

 

Hope this helps.

 

- Kewaneh

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Thanks. It is actually on a peak 50' higher than and 300' from the road on forest preserve property. The forest preserve uses standard ROW markers similar (but shorter) to the ones you showed. It has a triangle on the top surrounding a hole as though it was used for triangulation.

 

Brendan

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I always assumed it was a Cook-DuPage county border marker. It looks like the boundary currently follows the Des Plaines River, but maybe it didn't always.

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I always assumed it was a Cook-DuPage county border marker. It looks like the boundary currently follows the Des Plaines River, but maybe it didn't always.

 

That's a good call - some research is in order.

 

Brendan

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