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Details for Benchmark: RK0456

N 46° 32.967 W 087° 27.367 (NAD 83)

Altitude: 945.95

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

Location:
In MARQUETTE county, MI View Original Datasheet
Designation:
T 329
Marker Type:
metal rod
Setting:
stainless steel rod
Stability:
Probably hold position/elevation well.

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Found easily with description. The witness post is marked L 329, apparently grabbed from RK0458 up the road which was destroyed last summer.

[Photos:]
photoRK0456
photoRK0456 Area

Documented History (by the NGS)

01/01/1985 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1985 2.3 KM (1.4 MI) WEST FROM MARQUETTE. 2.3 KM (1.45 MI) WESTERLY ALONG STATE HIGHWAY 28 FROM ITS JUNCTION WITH WASHINGTON STREET IN MARQUETTE, 17.1 M (56.1 FT) NORTH OF THE CENTERLINE OF THE WEST BOUND LANES OF THE HIGHWAY, 11.8 M (38.7 FT) WEST OF THE CENTERLINE OF WRIGHT STREET, AND 0.8 M (2.6 FT) WEST OF A UTILITY POLE. NOTE--ACCESS TO DATUM POINT IS HAD THROUGH A 5-INCH LOGO CAP. THE MARK IS 0.3 METERS E FROM A WITNESS POST THE MARK IS ABOVE LEVEL WITH THE HIGHWAY.

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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