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Details for Benchmark: DX3292

N 33° 55.883 W 117° 56.267 (NAD 83)

Altitude: 324.88

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

Location:
In ORANGE county, CA View Original Datasheet
Designation:
2 C 71 68
Marker Type:
survey disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

Must Read!

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Christmas Day, as it turns out, is also an excellent time to visit this benchmark. The marker appears to be in perhaps slightly less good condition than it was in 2007, but still easily findable and legible. East end of the long brick wall separating the Washington amphitheatre from La Habra Blvd; couldn't be easier.

[Photos:]
photo2 C 71 68 area view
Looking NW across La Habra Blvd
photo2 C 71 68 close view

Recovered as described. Easy one. Best to do this on a weekend. You don't want to be wandering around in this area on a weekday.

[Photos:]
photoDX3292 direction
photoDX3292 Area
photoDX3292 Disc in La Habra, CA

Documented History (by the NGS)

01/01/1968 by CA-059 (MONUMENTED)
DESCRIBED BY ORANGE COUNTY CALIFORNIA 1968 AT LA HABRA. 0.40 MILE EAST ALONG CENTRAL AVENUE FROM LA HABRA CIVIC CENTER TO ITS INTERSECTION WITH COLLEGE STREET, AT WASHINGTON JUNIOR HIGH SCHOOL, 48 FEET SOUTH OF THE CENTER LINE OF CENTRAL AVENUE, 88 FEET WEST OF THE CENTER LINE OF COLLEGE STREET, 21 FEET WEST OF THE WEST EDGE OF THE SIDEWALK LEADING INTO AN OUTDOOR STADIUM, 4.5 FEET SOUTH OF A CONCRETE DROP INLET, IN THE TOP OF A CONCRETE FOOTING FOR A BRICK WALL AT THE EAST END OF THE WALL, ABOUT 1.5 FEET ABOVE THE LEVEL OF 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 ADD--CENTRAL AVENUE IS NOW CALLED AND MARKED LA HABRA BOULEVARD.

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 1993. * This is a READJUSTED BENCH MARK height. Code A indicates a distribution rate of 0.0 thru 1.0 mm/km. The height was derived from older observations constrained to new heights in a crustal motion area. The height is approximate in relation to other heights in its vicinity.
  • 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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