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Details for Benchmark: RK0460

N 46° 32.167 W 087° 30.183 (NAD 83)

Altitude: 1299.28

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

Location:
In MARQUETTE county, MI View Original Datasheet
Designation:
K 329
Marker Type:
bench mark disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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Found as described in good condition. Also found nearby a newly (2006) monumented K 329 RESET.

[Photos:]
photoRK0460
Benchmark with GPS
photoRK0460 Area
Benchmark is right next to the highway for easy finding.
photoK 329 Reset
This is NOT the benchmark described here, but is a newly monumented Reset located nearby--about 70 feet northwest of RK0460.
photoK 329 Reset Wider Shot
Again, NOT the BM described here, but a new reset mark located nearby. The fiberglass witness post is actually cemented right into the stone. The Reset was painted bright pink and has a complete witness post, so is much more visible than RK460. The reset Benchmark is about 70 feet northwest of RK460. Because the coordinates for RK460 are scaled and not precise and because the designation is similar, it would be easy for the casual observer to be confused.

Documented History (by the NGS)

01/01/1985 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1985 6.3 KM (3.9 MI) WEST FROM MARQUETTE. 6.3 KM (3.9 MI) WESTERLY ALONG STATE HIGHWAY 28 FROM ITS JUNCTION WITH WASHINGTON STREET IN MARQUETTE, IN THE NORTHEAST 1/3 OF A 10 BY 57 FOOT EXPOSED AREA OF OUTCROPPING BEDROCK, 0.1 KM (0.05 MI) SOUTHWEST OF THE INTERSECTION OF MIDWAY DRIVE, 10.8 M (35.4 FT) NORTHWEST OF THE CENTERLINE OF THE HIGHWAY, AND 1.6 M (5.2 FT) SOUTHWEST OF THE NORTHEAST END OF THE OUTCROP. THE MARK IS 0.3 METERS SE FROM A WITNESS POST THE MARK IS 1.0 M ABOVE 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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