1882 US PBM
Mike, I thought it was this one, which doesn't have a GPS suitability line.
Linebender is a bit further from home than I expected.
I can't get too much further away and be in my work area - 60000 square miles give or take. The 1882 description is more accurate than the datasheet. The datasheet led us astray for a minute or two. That plus the owner had a bench (the kind you sit on) in front of the mark. Data sheet says AT THE SOUTHEAST CORNER OF THE INTERSECTION OF MAIN AND CEDAR STREETS. 1882 says on the south corner of Main and Cedar. It's definitely not SE of the intersection. It is south or possibly SW. The data sheet lat/long put us 110 ft SE of the intersection. The mark is on the other side of the street. Also Main and Cedar run parallel in town nowadays. They don't intersect. Note the difference in height. 167.7492m 1882 river datum vs 161.515m NAVD88. Looks like Mike one upped me by a few years on his BM.
No intent to one-up, I noted your image and recollected the historically significant BM A in Hagerstown, MD. The issue you mention with the description are not rare. I also recollect the effort to digitize BM descriptions as part of the NAVD88 project. The basic process was to use USGS quadrangle maps and level run information to plot the benchmarks then scale the position.
In my previous response I provided a link to a interesting history of US leveling. I captured the information pertaining to BM A below:
Appreciate the perspective and history. I found a BM A about 350 miles NW of the subject handsome hewn red granite BM a few years ago. I think it was for the Missouri River survey on a tributary. I have never been able to find any information on it other than the NGS data sheet.
Every construction site I've worked on all the plans were in feet and inch and we always used feet and tenth tape for the layout.
Really? I have never seen a set of civil plans in feet and inches.