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Details for Benchmark: OM0530

N 43° 37.500 W 089° 46.300 (NAD 83)

Altitude: 905.59

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

Location:
In COLUMBIA county, WI View Original Datasheet
Designation:
B 903
Marker Type:
survey disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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The school on which this control point once was mounted no longer stands. This is now a a large park occupied by the new city library and the old one.

[Photos:]
photoSchool location
This old topographical map shows the footprint where the school once stood. (black rectangle with green dot)
photoThe old city library
Here is the old city library which was moved to this spot and now serves as a professional building. Another control point was once mounted on this building as well (See OM0544 Wisconsin Dells)
photoThe site today
From this point, we would be looking at the north wall of the school where this control point was mounted. In the background, you can see part of the new city library.

Documented History (by the NGS)

Unknown by USGS (MONUMENTED)
01/01/1934 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1934 AT WISCONSIN DELLS. VERTICAL MARK IN THE STONE WALL OF THE OLD PART OF WISCONSIN DELLS PUBLIC SCHOOL, 16 FEET EAST OF THE NORTH CENTER ENTRANCE, THENCE 33 FEET NORTH OF THE CONNECTING CORNER OF THE OLD AND NEW BUILDING, 1 FOOT ABOVE THE GROUND LEVEL.
01/01/1975 by USGS (MARK NOT FOUND)
RECOVERY NOTE BY US GEOLOGICAL SURVEY 1975 MARK NOT FOUND.
10/04/1995 by USPSQD (MARK NOT FOUND)
RECOVERY NOTE BY US POWER SQUADRON 1995 MARK NOT FOUND.

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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