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Details for Benchmark: HT0517

N 37° 42.600 W 122° 27.600 (NAD 83)

Altitude: 295.5

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 1241
Marker Type:
bench mark disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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Heute auch besucht.

#38

[Photos:]
photoHT0517

Been by here before for a cache. Came by again to log this benchmark with a pic.

[Photos:]
photoHT0517

Found it as per GC1V82E - BMC.

Found as previously indicated, painted over with gray, east end of south wall of Alemany Blvd undercrossing of I-280, near corner of Crystal Street, at posted coords of geocache GC1V82E.

[Photos:]
photoHT0517

We found it!

[Photos:]
photoIMG_2525
photoIMG_2521

I actually found this one in October, just can't remember the date, when I was looking for the cache, "BMC." I did not know that they would place the bench mark in this type of orientation.

It's been a while since I logged a benchmark, but since I visited this one as part of a geocache, I just wanted to note that it is doing fine.

Took me too long, kept looking on the ground.

Graffiti painted over along with the BM numerous times. Scraped off enough paint to see designation Q 1241

[Photos:]
photoHT0517

The disk was heavily painted over, but I cut a small piece of paint off and indeed it was Q 1241.

Documented History (by the NGS)

01/01/1972 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1972 AT SAN FRANCISCO. AT THE WEST CORNER OF THE JUNCTION OF ALEMANY BOULEVARD AND CRYSTAL STREET AT SAN FRANCISCO, SET VERTICALLY IN THE NORTHEAST FACE OF THE SOUTHWEST CONCRETE ABUTMENT OF INTERSTATE HIGHWAY 280 OVERPASS, 2.1 FEET NORTHWEST OF THE SOUTHEAST END OF THE ABUTMENT, 10.4 FEET SOUTHWEST OF THE SOUTHWEST CURB OF THE BOULEVARD, 71.6 FEET NORTHWEST OF THE NORTHWEST CURB OF THE STREET, AND ABOUT 3 FEET HIGHER THAN THE BOULEVARD SIDEWALK.

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  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.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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