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Details for Benchmark: JT9134

N 38° 17.983 W 122° 16.950 (NAD 83)

Altitude: 20

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

Location:
In NAPA county, CA View Original Datasheet
Designation:
54 J
Marker Type:
survey 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 it's still there it's paved over.

Documented History (by the NGS)

01/01/1971 by CA2330 (MONUMENTED)
DESCRIBED BY CITY OF NAPA CALIFORNIA 1971 AT INTERSECTION OF SOUTHERN PACIFIC RAILROAD AND FIRST STREET, IN NORTHWEST QUADRANT, A WELL TYPE CONCRETE MONUMENT WITH A BRASS CAP.

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  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.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