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Details for Benchmark: OM1223

N 43° 10.301 W 089° 15.897 (NAD 83)

Altitude: 988

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

Location:
In DANE county, WI View Original Datasheet
Designation:
070
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:
Probably hold position/elevation well.

Must Read!

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Oh, this one was easy! It's right alongside the road and fairly clearly marked. I stopped about 10 feet from it, got out of the car and there it was! Looks to be in great condition, with a good view of everything around. Took some pictures of a radio tower, microwave tower, and a water tower very far away. I will calculate what those benchmarks are and post some photos.

[Photos:]
photoHere it is!
photoWith GPS
photoView of the radio tower
photoA microwave tower is visible
photoA watertower is quite a distance away to the SSE

Documented History (by the NGS)

01/01/1988 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1988 THE STATION IS LOCATED ABOUT 3.6 KM (2.25 MI) EAST OF INTERSTATE HIGHWAY 90, 3.2 KM (2.00 MI) SOUTHWEST OF SUN PRAIRIE, 3.2 KM (2.00 MI) SOUTHEAST OF TOKEN CREEK AND ON ROAD RIGHT-OF-WAY. OWNERSHIP--STATE OF WISCONSIN, CONTACT PAUL G. RAPP, DEPARTMENT OF HIGHWAY AND TRANSPORTATION, COUNTY OF DANE, 2302 FISH HATCHERY ROAD, MADISON, WI 53713, PHONE 608-266-4261. TO REACH THE STATION FROM THE JUNCTION OF U.S. HIGHWAY 151 AND STATE HIGHWAY 19 IN SUN PRAIRIE, GO WEST ON STATE HIGHWAY 19 FOR 2.6 KM (1.60 MI) TO COUNTY ROAD C. TURN LEFT AND GO SOUTH ON COUNTY ROAD C FOR 1.7 KM (1.05 MI) TO THE MARK ON THE LEFT. THE STATION IS A DRIVEABLE MONUMENT WITH AN ALUMINUM CAP STAMPED---070 1987---, SET INSIDE A 5-INCH PVC PIPE THAT PROJECTS 2 CM ABOVE THE GROUND. THE ROD HAS BEEN DRIVEN 8 FEET INTO THE GROUND. LOCATED 8.7 M (28.5 FT) EAST FROM CENTER OF COUNTY ROAD C, 2.7 M (8.9 FT) SOUTH FROM POWERPOLE 8-10-12 AND 0.7 M (2.3 FT) WEST FROM A FIBERGLASS WITNESS POST. DANE COUNTY PART II, WI, 1988. THIS STATION IS SUITABLE FOR GPS SURVEYS. DESCRIBED BY D.A. BOWLING.

Control Text

  • The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in November 1991.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
  • The X, Y, and Z were computed from the position and the ellipsoidal ht.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The ellipsoidal height was determined by GPS observations and is referenced to NAD 83.
  • The geoid height was determined by GEOID99.

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