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Whose Benchmark Is This?

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While geo-caching in Gilpin Co and walking down South Missouri Flats Road (cowpath for 4-wheeler) I stumbled on this benchmark located at

N39 - 47.000 W105 - 29.896 in the middle of the gravel road - 1.5 inch stainless steel cap embedded into a concrete base at grade with the following inscriptions:


Survey Monument


591 MS16537


S18 T35 R72W


PLS 20140


Mike helped me back in Dec 2003 on another mystery. Maybe he can identify this benchmark?

Thanks to anyone who can help.


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591 MS16537


Have not figured the above out yet



S18 T35 R72W

Section 18

Town 35 (should be a S or N after this)

Range 72 West


2000 year set


PLS 20140

PLS=Professional Land Surveyor

20140 is his state license number


Address Lakewood, CO 80226

Phone Number


License Number PLS-20140

License Type Professional Land Surveyor

License Status Active


License First Issued January 7, 1983

Last Renewal Date February 1, 2005

License Expiration Date January 31, 2007


So you found a land boundry monument and not a bench mark.

Edited by Z15
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It appears to me the monument is marking a corner of a mineral survey (MS 16537). I cannot begin to guess what "MS SD G2 & 591" would mean. I have only performed a couple of mineral survey retracements and have marked the caps with just my PLS number, year the survey was done, Mineral Survey number and corner number.

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