I am doing some photo control on hwy 92, east of half moon bay. I found a bench mark labeled "bm 216" on the half moon bay quad sheet.
BUT ngs does not have info of this bench mark. Does anyone have a way too find the data for this bm?
It is a brass cap on a bridge . It has gwk 7.9 1946 & reset 1965 stamped on it. Any help would be appreciated.
Thanks in advance
Around Pilarcitos Creek
If it's along a highway, try your Caltrans district Surveys office for that mark or other un-published marks. Alternately, USGS Menlo Park or USGS Rocky Mountain Mapping Center?
216 is likely the approx. elevation
scale or Garmin a lat/lon and Search NGS datasheets by that criteria.
Also, if you have a Lat and Long for the BM (even an approximate one) you can use this site: http://www.ngs.noaa.gov/cgi-bin/datasheet.prl to do a radial search for any NGS control monuments around that area. It sometimes will turn up several documents, but if you grab the text, you can do a search for the text stamped on the cap and possibly turn up the monument that way.
You might try http://ask.usgs.gov if Caltrans or the County Surveyor can't help you .