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Details for Benchmark: HT1843

N 37° 45.033 W 122° 30.483 (NAD 83)

Altitude: 24.8

Coordinates may not be exact. Altitude is VERTCON and location is SCALED. (more info)

Location:
In SAN FRANCISCO county, CA View Original Datasheet
Designation:
Q 568
Marker Type:
bench mark disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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Was looking for a geocache, GC6MXVV, but instead found this CGS benchmark. Might as well log it and post the GPS photo.

[Photos:]
photoGPS with co-ords

Easy find with the prior logs and pics.

[Photos:]
photoimage

The coordinates are quite a ways off, Scaled, but the description takes you to the correct location. The disk has a little damage but still in useable condition.

N 37° 45.063 W 122° 30.496

Found in fair condition. The surface of the mark has been scraped and center may be difficult to use.

[Photos:]
photoHT1843 Q 568
photoHT1843 Q 568 setting

HT1843

This entry was edited by j2d2zhu on Wednesday, 28 December 2011 at 03:45:10 UTC.

[Photos:]
photo005
HT1843, Q568.
photo008
HT1843 at curb adjacent to sewer drain.
photo009
HT1843 at curb adjacent to sewer drain across the street from Muni #71 Bus Line Terminal.

My GPSr: N37 45.064, W122 30.498
Easily spotted curbside. Will post a few images. -Batch218-

[Photos:]
photoSurvey marker
photoMark with GPSr
photoIn situ

Easy to spot - 57 feet west of the hydrant

[Photos:]
photoQ 568
photoHT1843
photoLooking East

Today I found two Benchmarker when getting off from the bus This is my first time looking for Benchmark by accident.

Found it. A lot of new curbs in the area. I was surprised this benchmark was still intact. Benchmark is a bit scraped up.

[Photos:]
photoHT1843.jpg
photoHT1843 Location.jpg

Disk there as described.

Yippie, yahoo found it.
Crew member in area for work / pleasure.
Beautiful area.
Thanks to previous finders for description & photos,
ELECTRIC SHAVERS
Hamilton OH & D of C

N 37° 45.068 W 122° 30.499

This benchmark is pretty scrapped up, but I can still read the Q 568 mark. I noticed that the fender of the bus parked right next to the bench mark is just about the right height to put some gashes in the metal. Elevation was 2' above sea level.

I went benchmark hunting after a fun surf session at flyscheker's (sloat blvd.). The sun is out, the waves are mellow, and the crowd is friendly. What more could you ask for? and the Giants in the playoffs!

Documented History (by the NGS)

1/1/1939 by CGS (MONUMENTED)
1/1/1973 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1973 AT SAN FRANCISCO. AT SAN FRANCISCO, SAN FRANCISCO COUNTY, ON GREAT HIGHWAY, AT THE FOOT OF ORTEGA STREET, 57 FEET WEST OF A FIRE HYDRANT, 20 FEET WEST OF THE CENTERLINE OF THE LOWER LANE OF THE HIGHWAY, AND IN THE TOP OF THE CONCRETE CURB AT A CATCH BASIN. A STANDARD DISK, STAMPED Q 568 1939.

Control Text

  • The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.
  • The geoid height was determined by GEOID99.

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