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Location monument


bigthicket

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Posted

On a US Dept. of Agriculture forest service map I've come across a USLM; it is designated by a solid triangle. According to the map legend this is a US location or mineral monument. On a 24k Geological Survey topo it's shown as a USMM. Can anyone tell me the significance of this type of monument, particularly as it relates to benchmarks? I would like to know about it before I attempt to locate it......it'll be quite a hike. Thanks

Posted

Location Monuments and Mineral Monuments are cadastral (boundary related) monuments. If a survey of a mining claim or other survey was to be performed in an area that had no cadastral monuments (i.e. PLSS section corners) within 2 miles, a Location Monument or Mineral Monument could be set to serve as an initial point for the survey.

 

Cadastral monuments have little to do with the geodetic marks that comprise the database of benchmarks that are loggable on GC.com. Occasionally the position and/or elevation of an existing cadastral monument was determined by a geodetic survey crew to save having to set their own monument, so there are exceptions.

 

Having said that, I'd encourage you to check it out anyway. They tend to be older chiseled stone monuments, which I always enjoy finding. I use National Geographic TOPO to scale the coordinates of the point on the map, and use that as search point.

 

Let me poke around and see if I can find a photo of one I've posted previously.

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