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Details for Benchmark: DY0786

N 33° 48.617 W 118° 04.600 (NAD 83)

Altitude: 39.65

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

Location:
In ORANGE county, CA View Original Datasheet
Designation:
CC 5
Marker Type:
traverse station disk
Setting:
abutments and piers of large bridges
Stability:
Probably hold position/elevation well.

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Part of a nice walk finding local benchmarks.

N 33° 48.619 W 118° 04.585

Out for a bike ride and noticed this mark along the way. Funny thing is that it was actually not loaded into my GPSr at the time. I photo'd anyway just in case. Most times, these "extra" marks are not NGS listed marks, but this one happened to be one of interest.

[Photos:]
photoDY0786
Close-up of the mark.
photoDY0786 Location
Location of the mark.
photoDY0786 Area
The area around the mark.

Right on my bike path in good condition. My photo was same as one previously posted.

Out on a power benchmarking day with Sparqui & LBGUZ5...one of 13 located today. Pictures to follow.

Recovered as described.

[Photos:]
photoDY0786 disc closeup near Los Alamitos CA
photoDY0786 mark area
Note water in the LA "style" concrete river. Not at all common!
N 33° 48.622 W 118° 04.583

Recovered in good condition. This benchmark was placed in 1957.

[Photos:]
photoBenchmark
photoLooking east

Documented History (by the NGS)

01/01/1957 by DOD (MONUMENTED)
01/01/1968 by CA-037 (GOOD)
DESCRIBED BY LOS ANGELES COUNTY CALIFORNIA 1968 AT LOS ALAMITOS. 900 FEET WEST ALONG CERRITOS AVENUE FROM ITS INTERSECTION WITH LOS ALAMITOS BOULEVARD TO BRIDGE B 1110 OVER COYOTE CREEK, 15 FEET SOUTH OF THE CENTER OF THE EAST BOUND TRAFFIC LANES OF CERRITOS AVENUE, 2.5 FEET WEST OF THE WEST END OF THE STEEL GUARD RAIL ON THE SOUTH SIDE OF THE BRIDGE, 0.4 FOOT NORTH OF THE SOUTH EDGE OF THE BRIDGE, IN THE TOP OF THE CONCRETE BRIDGE ABUTMENT, ABOUT 1.0 FOOT ABOVE THE LEVEL OF THE ROAD.
01/01/1978 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978 RECOVERED IN GOOD CONDITION.
04/17/1989 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1989 RECOVERED IN GOOD CONDITION. A NEW DESCRIPTION FOLLOWS. 0.4 KM (0.25 MI) WESTERLY ALONG CERRITOS AVENUE FROM THE JUNCTION OF LOS ALAMITOS BOULEVARD IN LONG BEACH, IN TOP OF AND 0.4 M (1.3 FT) NORTHEAST OF THE SOUTHWEST END OF THE WEST CONCRETE ABUTMENT OF THE BOULEVARD BRIDGE SPANNING COYOTE CREEK, 5.1 M (16.7 FT) SOUTH OF THE CENTERLINE OF THE EASTBOUND LANES OF THE BOULEVARD, AND 0.3 M (1.0 FT) ABOVE THE LEVEL OF THE BOULEVARD.
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 NATIONAL GEODETIC SURVEY 1989.

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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