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Details for Benchmark: HT1608

N 37° 18.417 W 122° 02.750 (NAD 83)

Altitude: 344.1

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

Location:
In SANTA CLARA county, CA View Original Datasheet
Designation:
P 180=2710 CAGS
Marker Type:
survey disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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Found under pipe, same part of disc seems to be hanging on.

[Photos:]
photoStill visible but only a partial disc
N 37° 18.429 W 122° 02.766

As with FredHyden previously, I found half of this benchmark. The "P180" stamping is visible on the remaining portion. The distance to Rainbow Ave. is a bit closer, just under 0.5 miles.

[Photos:]
photoArea Around HT1608
Camera is pointing west. The BM is located on the left concrete culvert below the pipe.
photoWhat Remains of P180=2710

Half of the disk is broken away. The description of the location is accurate. There is another disk, T1077, on the other side of the tracks. Best approach I could find was to walk down the dirt service road that parallels the tracks starting from McClellan Road. Distance .6 miles.

[Photos:]
photoHT1608

Documented History (by the NGS)

Unknown by CAGS (MONUMENTED)
01/01/1954 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1954 3.6 MI N FROM SARATOGA. 2.1 MILES NORTH ALONG STATE HIGHWAY 9 FROM THE POST OFFICE AT SARATOGA, THENCE 1.5 MILES NORTHWEST ALONG THE SOUTHERN PACIFIC COMPANY RAILROAD, AT BRIDGE 42.12, IN THE TOP OF THE SOUTHWEST END OF THE RAISED PORTION OF THE SOUTHEAST CONCRETE ABUTMENT, 23.1 FEET SOUTHWEST OF THE SOUTHWEST RAIL, AND ABOUT 1 FOOT LOWER THAN THE TRACK.
01/01/1960 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1960 RECOVERED IN GOOD CONDITION.

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  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.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