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Details for Benchmark: HT1655

N 37° 19.800 W 122° 01.917 (NAD 83)

Altitude: 231.5

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

Location:
In SANTA CLARA county, CA View Original Datasheet
Designation:
WELL 42
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:
Probably hold position/elevation well.

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Documented History (by the NGS)

Unknown by CGS (MONUMENTED)
01/01/1954 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1954 0.5 MI N FROM CUPERTINO. 0.5 MILE NORTH ALONG STATE HIGHWAY 9 FROM THE POST OFFICE AT CUPERTINO, AT THE INTERSECTION OF MARIANI AVENUE LEADING EAST AND A DIRT FARM ROAD LEADING WEST, AT SANTA CLARA VALLEY WATER CONSERVATION DISTRICT WELL 42, THE 1-INCH SECTION ON THE NORTHWEST SIDE OF THE TOP OF THE CASING BETWEEN TWO CHISELED NOTCHES, 98.1 FEET WEST OF THE CENTER LINE OF THE HIGHWAY, 10 1/2 FEET NORTH OF THE CENTER LINE OF THE ROAD, 3.8 FEET SOUTH OF A WITNESS POST, ABOUT LEVEL WITH THE HIGHWAY, 0.2 FOOT ABOVE GROUND, AND LEVEL WITH THE 2-FOOT DIAMETER CIRCULAR CONCRETE BLOCK AROUND THE TOP OF THE WELL.
01/01/1967 by NGS (MARK NOT FOUND)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1967 MARK NOT FOUND.

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  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.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