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Details for Benchmark: HT1213

N 37° 24.500 W 122° 04.133 (NAD 83)

Altitude: 37.3

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

Location:
In SANTA CLARA county, CA View Original Datasheet
Designation:
E 111
Marker Type:
bench mark disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

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If the description is accurate this is now under the newly built Shoreline Road exit from Northbound 101.

Coords far off. Description of position places this mark on the edge if not under a new freeway offramp. It is possible mark might become visible after construction crews leave and clean up the shoulder.

Documented History (by the NGS)

01/01/1932 by CGS (MONUMENTED)
01/01/1967 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1967 0.2 MI NW FROM MOUNTAIN VIEW. 0.15 MILE NORTHWEST ALONG THE BAYSHORE FREEWAY FROM THE MOFFETT BOULEVARD OVERPASS AT MOUNTAIN VIEW, 0.05 MILE EAST OF STATE HIGHWAY 85 OVERPASS, 46 FEET NORTH OF THE NORTH EDGE OF THE NORTH LANES OF THE FREEWAY, 88.7 FEET WEST OF THE NORTHWEST CORNER OF BRIDGE 48-04 OVER STEVENS CREEK, 30.2 FEET SOUTHWEST OF THE SOUTHWEST LEG OF A STEEL TOWER OF A POWER TRANSMISSION LINE, 1.8 FEET EAST OF A WITNESS POST, ABOUT 1 FOOT LOWER THAN THE FREEWAY, AND SET IN THE TOP OF A CONCRETE POST PROJECTING 0.6 FOOT ABOVE THE GROUND.

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  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.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