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Details for Benchmark: PR1127

N 44° 53.367 W 097° 03.433 (NAD 83)

Altitude: 1788.71

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

Location:
In CODINGTON county, SD View Original Datasheet
Designation:
I29 178.01
Marker Type:
bench mark disk
Setting:
pavements (street, sidewalk, curb, apron, etc.)
Stability:
Mark of questionable or unknown stability.

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Documented History (by the NGS)

Unknown by SDDT (MONUMENTED)
07/03/1990 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1990 IN WATERTOWN, AT THE INTERSECTION OF U.S HIGHWAY 212 AND INTERSTATE HIGHWAY 29 (EXIT 177), IN THE EAST CONCRETE CURB OF THE INTERSTATE HIGHWAY OVERPASS OF THE U.S. HIGHWAY, 5.2 M (17.1 FT) EAST OF THE CENTERLINE OF THE SOUTHBOUND LANES OF THE HIGHWAY, 2.3 M (7.5 FT) SOUTH OF THE NORTH END OF THE OVERPASS, AND 0.3 M (1.0 FT) ABOVE THE LEVEL OF THE INTERSTATE HIGHWAY.
09/19/1995 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1995 (GAS) IN WATERTOWN, AT THE INTERSECTION OF INTERSTATE HIGHWAY 29 AND U.S. HIGHWAY 212, NEAR THE NORTH END OF THE EAST CONCRETE CURB OF THE SOUTHBOUND INTERSTATE HIGHWAY 0VERPASS OF THE U.S. HIGHWAY, 41.0 M (134.5 FT) SOUTHEAST OF MILEPOST 178, 33.7 M (110.6 FT) NORTH OF THE CENTERLINE OF THE U.S. HIGHWAY, 5.2 M (17.1 FT) EAST OF THE CENTERLINE OF THE SOUTHBOUND LANES OF THE HIGHWAY, 2.3 M (7.5 FT) SOUTH OF THE NORTH END OF THE OVERPASS, AND 0.3 M (1.0 FT) ABOVE THE LEVEL OF THE INTERSTATE HIGHWAY.
09/19/1995 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1995 (GAS) IN WATERTOWN, AT THE INTERSECTION OF INTERSTATE HIGHWAY 29 AND U.S. HIGHWAY 212, NEAR THE NORTH END OF THE EAST CONCRETE CURB OF THE SOUTHBOUND INTERSTATE HIGHWAY 0VERPASS OF THE U.S. HIGHWAY, 5.2 M (17.1 FT) EAST OF THE CENTERLINE OF THE SOUTHBOUND LANES OF THE HIGHWAY, 2.3 M (7.5 FT) SOUTH OF THE NORTH END OF THE OVERPASS, AND 0.3 M (1.0 FT) ABOVE THE LEVEL OF THE INTERSTATE HIGHWAY.
10/11/1996 by CHANCE (GOOD)
RECOVERY NOTE BY JE CHANCE AND ASSOCIATES 1996 (LH) RECOVERED AS DESCRIBED.

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 July 1998.
  • 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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