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Details for Benchmark: HS3038

N 37° 21.300 W 121° 50.967 (NAD 83)

Altitude: 98.3

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

Location:
In SANTA CLARA county, CA View Original Datasheet
Designation:
RV 2603 CAGS
Marker Type:
rivet
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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DNF but didn't look very hard as the bridge was apparently replaced or upgraded very recently and it may very well have been destroyed.

[Photos:]
photoMarkings and condition suggest new bridge

Documented History (by the NGS)

Unknown by CAGS (MONUMENTED)
01/01/1954 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1954 1.4 MI SW FROM ALUM ROCK. 1.4 MILES SOUTHWEST ALONG ALUM ROCK AVENUE FROM JAMES LICK HIGH SCHOOL AT ALUM ROCK, BETWEEN MC CREERY AND SUNSET AVENUE, AT CONCRETE BRIDGE 37-19 A-0.34, IN THE TOP OF THE SOUTHEAST CONCRETE CURB, 48.9 FEET SOUTHEAST OF THE CENTER LINE OF THE AVENUE, 7.4 FEET NORTHEAST OF THE SOUTHWEST END OF THE CURB, ABOUT LEVEL WITH THE AVENUE, AND 0.4 FOOT ABOVE THE BRIDGE FLOOR.
01/01/1969 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1969 RECOVERED IN GOOD CONDITION.
01/01/1986 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1986 (DSP) 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  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.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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