When brass caps get replaced?

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08-17-2014 09:53 AM
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New Contributor III

I visited four peaks in Colorado and found only one brass cap. Is there a replacement policy and is it there a requirement for brass caps for peaks? Thank You

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Esri Notable Contributor

Do you mean surveying control marks or bench marks? I assume that it depends on whether they were ever surveyed to the standard. It's possible the marks have been removed or destroyed. You can see if there should be anything by using the NGS datasheet page. The descriptions will also describe how to find them and when last found.

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Regular Contributor

+1 for surveying control marks or bench marks?

Bench marks

OS_Benchmark_Bolt_St_Botolphs_church_Boston_-_geograph.org.uk_-_712831.jpg

Or even:

169595_90321e40.jpg

http://upload.wikimedia.org/wikipedia/commons/7/7d/OS_Benchmark_Bolt_St_Botolphs_church_Boston_-_geo...

Surface marks:

1904726_da00c8d1.jpg

(N.B I got these images off the internet)

The two types have different information written on them and in the UK look different...I know in the UK they are now being left until they are destroyed by erosion or the land being redeveloped. not much help as you're looking at Colorado... 🙂 but I guess they could have been destroyed or could have not been built.