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Details for Benchmark: DX3260

N 33° 56.417 W 117° 53.400 (NAD 83)

Altitude: 413.22

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

Location:
In ORANGE county, CA View Original Datasheet
Designation:
J 351
Marker Type:
bench mark 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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Re-find. Remains as described.

[Photos:]
photoDX3260 Disc in Brea CA

As Described, found eventually, after a couple false starts.

[Photos:]
photoDX3260 disc near Brea CA
photoDX3260 area near Brea CA

Documented History (by the NGS)

1/1/1949 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1949 1.5 MI NE FROM BREA. ABOUT 1.1 MILES NORTHEAST ALONG THE BREA CANYON ROAD FROM THE GRAMMAR SCHOOL AT THE NORTH EDGE OF BREA TO A DIRT SIDE ROAD LEFT. IT IS A 12 INCH SQUARE CONCRETE POST PROJECTING 4 INCHES WHICH IS 33 FEET NORTHWEST OF HIGHWAY CENTER LINE, 11 FEET SOUTHWEST OF THE CENTER OF DIRT ROAD, 7.8 FEET NORTH OF A TELEPHONE POLE AND 6 FEET NORTH OF THE NORTHEAST END OF A GUARD RAIL FENCE.
1/1/1974 by CA-059 (GOOD)
RECOVERY NOTE BY ORANGE COUNTY CALIFORNIA 1974 RECOVERED IN GOOD CONDITION.
1/1/1978 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978 RECOVERED IN GOOD CONDITION.
3/25/1994 by MWDSC (GOOD)
RECOVERY NOTE BY METRO WATER DISTR SO. CALIFORNIA 1994 (DEL) RECOVERED IN GOOD CONDITION. ADD THE FOLLOWING--72.0 FT (21.9 M) NORTHEASTERLY OF THE NORTHEAST END OF BRIDGE NUMBER 55-37. RECESSED IN 12 INCH SQUARE CONCRETE POST AND 4 INCHES ABOVE GROUND ON SHOULDER OF BREA CANYON RD. REFERENCE MWD FB 2011 02 059.
6/6/1998 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1998 RECOVERED IN GOOD CONDITION.

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 February 1997.
  • 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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