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Details for Benchmark: JT9285

N 38° 17.883 W 122° 17.150 (NAD 83)

Altitude: 20.4

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

Location:
In NAPA county, CA View Original Datasheet
Designation:
1190 C
Marker Type:
bolt
Setting:
pavements (street, sidewalk, curb, apron, etc.)
Stability:
Mark of questionable or unknown stability.

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The curbs sidewalks downtown have all been redone. I think many of these bolts are gone.

Documented History (by the NGS)

01/01/1971 by CA2330 (MONUMENTED)
DESCRIBED BY CITY OF NAPA CALIFORNIA 1971 AT FIRST AND BROWN STREETS, IN SOUTHWEST CORNER ON CURB, A CARRIAGE BOLT (NO. 2).

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  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.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