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US Dept of Agriculture Flood Control Survey (1942)
(hexbear.net)
Out at a place built by the Civilian Conservation Corps back in 1935/36. Found this while walking around. I think this was used for surveying changes to the land around where I am, as this area was dammed in the 1930s.
I've been searching for something specific to these but I think due to their age it might be lost to time.
I made another post about a building made by the CCC back in the mid 1930s, and this particular marker is at the top of a stair landing behind that building driven down into the surrounding rock.
There is another one I know of, sort of on the other side of a relatively large cove I was on earlier. Im not sure if these two particular ones are a pair, or are related to each other somehow.