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Details for Benchmark: DY0075

N 33° 51.517 W 118° 02.650 (NAD 83)

Altitude: 56.36

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

Location:
In ORANGE county, CA View Original Datasheet
Designation:
CC 27
Marker Type:
survey disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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Found it at N 33 51.517 W 118 02.565.

Found this Benchmark with the help of the logs before me, thanks.

I found it!

[Photos:]
photostamp.jpg

Busy bridge, but safe enough. Parked by Mickey-D's!

[Photos:]
photoDY0075 disk in bridge support in Southern CA
photoDY0075 Area shot. Long way down!

Cool Corps of Engineers disk on top of the south end of the eastern pier wall. I got N33/51.518 W118/2.563. This is a popular spot for surveyors, with nail 2833 (LA Co. Flood Control District) and BM 2013 in the sidewalk.
-Hopscotch

Documented History (by the NGS)

01/01/1958 by DOD (MONUMENTED)
01/01/1968 by CA-059 (GOOD)
DESCRIBED BY ORANGE COUNTY CALIFORNIA 1968 IN LA PALMA. 0.55 MILE WEST ALONG ORANGETHORPE AVENUE FROM THE OVERCROSSING OF THE ARTESIA FREEWAY TO THE OVERCROSSING OF COYOTE CREEK, 225 FEET EAST OF THE WEST END OF THE BRIDGE, 110 FEET WEST OF THE EAST END OF THE BRIDGE, 27.5 FEET SOUTH OF THE CENTER LINE OF ORANGETHORPE AVENUE, 2 FEET SOUTH OF THE STEEL HAND RAIL, IN THE TOP OF A CONCRETE PILE BRIDGE SUPPORT, ABOUT LEVEL WITH THE ROAD.
01/01/1974 by CA-059 (GOOD)
RECOVERY NOTE BY ORANGE COUNTY CALIFORNIA 1974 RECOVERED IN GOOD CONDITION.
01/01/1978 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978 RECOVERED IN GOOD CONDITION.
08/16/1994 by CA-059 (GOOD)
RECOVERY NOTE BY ORANGE COUNTY CALIFORNIA 1994 (JK) RECOVERY NOTE BY ORANGE COUNTY CALIFORNIA 1994. RECOVERED AS DESCRIBED BY ORANGE COUNTY CALIFORNIA 1968.

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 1995.
  • 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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