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Details for Benchmark: DX2221

N 33° 47.550 W 117° 51.083 (NAD 83)

Altitude: 200.55

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

Location:
In ORANGE county, CA View Original Datasheet
Designation:
J 1 RESET
Marker Type:
bench mark disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

Must Read!

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Walked over to campus specifically to locate this BM. Currently unobscured by paint.

[Photos:]
photoJ 1 RESET
photoJ 1 RESET area shot
BM is on south exterior wall of building, east of entrance

We were at the University doing CRAWILs Multi Cache when I spotted this cool Bench Mark.

J1 1924 (DX2221) Chapman College, Wilkinson Hall. (Coords. N 33 47.528, W 117 51.093). Vertical Benchmark

[Photos:]
photoDX2221 - J1 1924 Current Image
photoDX2221 - J1 1924 Close-up
photoDX2221 - J1 1924 Wilkinson Hall Plaque
Chapman College Wilkinson Hall Plaque

Found this one with AWEMM after having lunch with Crawil. He showed us this Benchmark after we did his Multi at the College. Great history at this location!

On the South side of Wilkinson Hall.

[This entry was edited by Mark1962 on Saturday, June 07, 2008 at 12:31:40 AM.]

[Photos:]
photoOne of a kind
photoA quiet weekend
new Carpeting for the Building???
photoPlaque
104 Years old and counting.
photoIMG_4064

Since part of campus is currently under construction, I had to walk right past this benchmark on the way to my office! I'm glad I finally had an opportunity to stop and notice it.

[Photos:]
photoBenchmark
photoLooking to the east.
photoLooking to the west.

Found this while walking around the campus during commencement. BMs are great.

Found it today on my lunchtime work at work.

N 33° 47.528 W 117° 51.093

Took a little detective work, and a 3 block walk from the nearest legal parking, but it's there! What WAS the northeast edge of the campus in not any longer. More like the center now. But with the coords above you can find it easily enough. From Glassel, take the 3rd walkway north of Palm to the east, for about 440 feet from the sidewalk, and you will find Wilkinson Hall and the mark.

[Photos:]
photoDX2221 Building Plaque, Orange CA
Located at Chapman College in Orange CA. This is one of 5 or 6 buildings from the early 20th century which are noted as Historic Places.
photoDX2221 Disc in Orange CA
photoDX2221 Area and building front
photoShowing that the mark is flat

Documented History (by the NGS)

1/1/1924 by CGS (MONUMENTED)
1/1/1955 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1955 AT ORANGE. AT ORANGE, 0.4 MILE NORTH ALONG NORTH GLASSELL STREET FROM THE PLAZA, AT THE CHAPMAN COLLEGE (FORMER UNION HIGH SCHOOL), ABOUT 167 YARDS EAST OF NORTH GLASSELL STREET, AT THE ACADEMIC BUILDING, SET VERTICALLY IN THE SOUTH FACE OF THE CONCRETE PILLAR ON THE EAST SIDE OF THE ENTRANCE, 12.4 FEET NORTH OF THE NORTH CURB OF A CONCRETE STREET ON THE SOUTH SIDE OF THE BUILDING, 11.6 FEET EAST OF THE EAST EDGE OF THE EAST BANISTER TO THE SOUTH ENTRANCE TO THE BUILDING, AND ABOUT 5 FEET HIGHER THAN THE GROUND.
1/1/1974 by CA-059 (MARK NOT FOUND)
RECOVERY NOTE BY ORANGE COUNTY CALIFORNIA 1974 MARK NOT FOUND.
1/1/1977 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1977 AT ORANGE, 0.4 MILE NORTH ALONG GLASSELL STREET FROM THE PLAZA AT THE CHAPMAN COLLEGE, AT THE NORTHEAST CORNER OF THE CAMPUS, 167 YARDS EAST OF NORTH GLASSELL STREET, AT WILKINSON HALL, SET VERTICALLY IN THE SOUTH FACE OF THE CONCRETE PILLAR ON THE EAST SIDE OF THE SOUTH SIDE OF THE BUILDING, 11.6 FT EAST OF THE EAST EDGE OF THE EAST BANISTER TO THE SOUTH ENTRANCE TO THE BUILDING, 5 FT. HIGHER THAN THE GROUND.
1/1/1988 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1988 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 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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