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Details for Benchmark: DX0171

N 33° 06.667 W 116° 26.867 (NAD 83)

Altitude: 2106.14

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

Location:
In SAN DIEGO county, CA View Original Datasheet
Designation:
J 580
Marker Type:
bench mark disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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Another epic BenchMark run with Supercheeseburger!

[Photos:]
photoDX0171

Found it with Team Geo-Clarks using previous cachers updated coords. Directions are good.

[Photos:]
photoDX0171

As described, recoved in good condition. 2 foot from edge of highway, north side.

[Photos:]
photoJ580

Easy find.

[Photos:]
photoDX0171
N 33° 06.670 W 116° 26.873

Moderately easy find, at upper end of pullout. Had some debris fall on it from steep hillside above.

[Photos:]
photoDX0171
photoView looking SW - bm at lower right

Documented History (by the NGS)

01/01/1939 by CGS (MONUMENTED)
01/01/1956 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1956 13.7 MI E FROM JULIAN. 13.7 MILES EAST ALONG STATE HIGHWAY 78 FROM THE POST OFFICE AT JULIAN, 0.9 MILE WEST OF THE SOUTHWEST END OF CONCRETE BRIDGE 57-96 OVER SAN FELIPE CREEK, IN THE TOP OF A LEDGE ON AN OUTCROP, 230 FEET EAST OF A CORRUGATED METAL WATER TANK ON THE SLOPE OF A HILL, 102 FEET EAST OF THE APPROXIMATE CENTER OF A SMALL DRAW LEADING NORTHWEST, 15 FEET NORTH OF THE CENTER LINE OF THE HIGHWAY, AND ABOUT 1 FOOT HIGHER THAN THE HIGHWAY.
01/01/1969 by CA-073 (GOOD)
RECOVERY NOTE BY SAN DIEGO COUNTY CALIFORNIA 1969 RECOVERED IN GOOD CONDITION.
01/01/1978 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978 RECOVERED IN GOOD CONDITION.
06/28/1995 by CADT (GOOD)
RECOVERY NOTE BY CALTRANS 1995 (ATD) THE STATION WAS LEVELED TO BY CADT AS A PART OF THE 1995 PERIPHERAL RUN IN SAN DIEGO COUNTY TO ESTABLISH NAVD 1988.

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 May 2000. No vertical observational check was made to the station.
  • 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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