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Details for Benchmark: DX2729

N 33° 53.867 W 117° 15.517 (NAD 83)

Altitude: 1530

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

Location:
In RIVERSIDE county, CA View Original Datasheet
Designation:
D 753
Marker Type:
bench mark disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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As previously stated, the mark is painted over, but still legible.

[Photos:]
photoDX2729
photoDX2729 setting

Found while on March ARB for training.

Woo-Hoo! FTF! And from 1945, too. Was able to access it during the recent Air Show at March Field, now March Air Reserve Base (ARB). Description is otherwise still valid.

[Photos:]
photoDFX2729 Disc Closeup
Painted,. but readable. Location as described.
photoDX2729 Area, showing building
Building is the old (original) base Operations building at what is once again March Field, on March Air Reserve Base (ARB). For a long time between 1945 and now it was March Air Force Base (AFB). Many, many pilots have come & gone through those doors (including Klemmer when he was an Air Force pilot, flying the C-9A). Sure didn't know what a benchmark was back then!
photoUS Air Force Thunderbirds
The day could have been clearer, but this one came out pretty good. Nice tight echelon formation. Enjoyed the Air Show!

Documented History (by the NGS)

01/01/1945 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1945 AT MARCH FIELD. AT MARCH FIELD, AT THE BASE OPERATIONS BUILDING (BLDG. 470), IN THE CENTER OF THE SOUTHWEST FACE OF THE WALL SURROUNDING THE BAY WINDOW WHICH PROJECTS FROM THE CENTER OF THE SOUTHWEST FACE OF THE BUILDING AND WHICH FORMS PART OF THE AIRCRAFT DISPATCHERS OFFICE, 2.8 FEET BELOW THE TOP OF THE CENTER OF WINDOW SILL FOR THE DOUBLE WINDOW, 2.5 FEET ABOVE THE GROUND, SET VERTICALLY.

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  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.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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