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Details for Benchmark: DY2424

N 33° 44.717 W 118° 06.667 (NAD 83)

Altitude: 9.2

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

Location:
In ORANGE county, CA View Original Datasheet
Designation:
T 280 RESET 1975
Marker Type:
bench mark disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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Found while visiting friends

[Photos:]
photoThe Mark
photoThe Location
photoThe area.

I accidentally stumbled across this benchmark at N 33 44.733, W 118 06.697 while walking from my car to look for SGRT - Get On the Rocks.

[Photos:]
photoDY2424 aka T 280 RESET 1975

Found this while geocaching in Seal Beach. Looking for benchmarks is a nice addition to looking for geocaches.

Recovered as described.

[Photos:]
photoDY2424 Looking East on First St
photoDY2424 Area
photoDY2424 in Seal Beach CA
N 33° 44.731 W 118° 06.696

Out for a walk and some benchmarking while my wife ran the Seal Beach 10K. This mark was right where it was supposed to be.

[Photos:]
photoDY2424
Closeup of the mark.
N 33° 44.734 W 118° 06.700

Missed it the first time (12/15). Came back with a compass and followed the description to find the marker. The benchmark is at the edge of a construction area.

[last edit: 1/2/2004 6:11:22 PM PST]

[Photos:]
photoDY2424
photoMarker location

My first benchmark in Orange County! (Although it is just barely in Orange County.) This one was exactly where it was supposed to be.

[Photos:]
photoSW from DY2424
photoDY2424

Documented History (by the NGS)

01/01/1975 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1975 AT SEAL BEACH. AT SEAL BEACH, CEMENTED IN A DRILL HOLE FLUSH WITH THE TOP SURFACE OF THE SOUTHWEST CORNER OF A STORM DRAIN THAT IS LOCATED IN THE SOUTHWEST QUADRANT OF THE CROSSROAD INTERSECTION OF MARINA DRIVE AND FIRST STREET. IT IS 70.0 FEET SOUTH OF THE CENTER OF MARINA DRIVE, 41.0 FEET WEST OF THE CENTER OF FIRST ST., 29.5 FEET NORTH OF POWERLINE POLE NUMBER 2021503E, 17.0 FEET SOUTHWEST OF A STEEL STREET LIGHT AND TRAFFIC SIGNAL POLE, 5.3 FEET EAST OF A CHAINLINK FENCE AND 2.4 FEET SOUTHWEST OF THE CENTER OF A STEEL MANHOLE COVER IN THE TOP OF THE STORM DRAIN.

Control Text

  • The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.
  • The geoid height was determined by GEOID99.

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