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Details for Benchmark: HT1859

N 37° 47.883 W 122° 11.083 (NAD 83)

Altitude: 465.5

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

Location:
In ALAMEDA county, CA View Original Datasheet
Designation:
R 1253
Marker Type:
bench mark disk
Setting:
abutments and piers of large bridges
Stability:
Probably hold position/elevation well.

Must Read!

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This is the closest Benchmark from my house. I decided to take a quick walk to Safeway, as opposed to the usual drive, and find this benchmark.

[Photos:]
photoHT1859

spotted this some time ago and never remember to look it up and log it

Another benchmark!

N 37° 47.926 W 122° 11.151

The abutment is now part of the sidewalk, and it is about level with the road, not the highway as stated in the NGS description. Except for a bit of accumulated dirt, the benchmark is in good condition.

[Photos:]
photoR 1253, Close Up
photoR 1253 and GPSr
I brushed away most of the dirt accumulated on top of the BM.
photoArea Around HT1859
Camera is pointing east. The benchmark is located on the sidewalk, in the shade, just west of the seam in the concrete.

Documented History (by the NGS)

01/01/1974 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1974 1.9 KM (1.20 MI) NORTH FROM OAKLAND. 1.2 MILES NORTH ALONG STATE HIGHWAY 13 FROM THE JUNCTION OF INTERSTATE HIGHWAY 580 IN OAKLAND, AT THE REDWOOD ROAD OVERPASS, IN THE TOP OF THE SOUTHWEST CONCRETE ABUTMENT, 15.5 FEET NORTH OF THE CENTERLINE OF THE WEST BOUND LANES OF THE ROAD, 9.4 FEET SOUTHEAST OF THE NORTHWEST END OF THE ABUTMENT, 1.0 FEET NORTH OF THE NORTH CONCRETE GUARDRAIL, AND ABOUT LEVEL WITH THE HIGHWAY.

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  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.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