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Details for Benchmark: JS0788

N 38° 54.200 W 121° 03.983 (NAD 83)

Altitude: 1366.42

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

Location:
In PLACER county, CA View Original Datasheet
Designation:
U 1200
Marker Type:
bench mark disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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In the area

Got another one

Found while geocaching nearby

Found as described in good condition.

[This entry was edited by 2/3 Marine on Sunday, March 25, 2007 at 9:48:36 PM.]

[Photos:]
photoJS0788 U 1200

Easy find but too near the tracks for little children.

[Photos:]
photoMarker
photoA view from the wrong side of the tracks

Coordinates were way far off but I found it anyway.

[Photos:]
photoRail Road Overpass over HW49 in Auburn.
Close up of the Benchmark.

Documented History (by the NGS)

01/01/1969 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1969 AT AUBURN. AT AUBURN, 0.1 MILE NORTH ALONG THE SOUTHERN PACIFIC COMPANY RAILROAD FROM THE STATION, IN THE TOP AND 0.6 FOOT NORTH OF THE SOUTH END OF THE WEST CONCRETE GUARDRAIL CURB OF EL DORADO STREET UNDERPASS, 6.3 FEET WEST OF THE WEST RAIL OF THE WESTBOUND MAIN TRACK, AND ABOUT 1 FOOT HIGHER THAN THE TRACK.

Control Text

  • The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in June 1991.
  • The geoid height was determined by GEOID99.
  • The dynamic height is computed by dividing the NAVD 88 geopotential number by the normal gravity value computed on the Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45 degrees latitude (G = 980.6199 gals.).
  • The modeled gravity was interpolated from observed gravity values.

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