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Details for Benchmark: RL1462

N 46° 32.567 W 088° 09.400 (NAD 83)

Altitude: 1626.69

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

Location:
In BARAGA county, MI View Original Datasheet
Designation:
F 328
Marker Type:
bench mark disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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Mark not found, believed to be destroyed. The state has been cutting back rock outcroppings from the edge of the highway during construction, and this mark is believed to be a casualty.

A 2002 reset mark was found north of the described location. The photos included in this log are of the RESET mark, not the mark described in this datasheet.

[Photos:]
photoF 328 RESET
RESET for this mark, with GPS
photoF 328 RESET Area
I initially thought I had found the witness post from the original mark that had been tossed by construction workers into the woods. I then found it had been attached to a wooden post and driven into the ground, and had simply fallen over, and was marking the location of the pictured reset mark.

Documented History (by the NGS)

01/01/1985 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1985 15.9 KM (9.9 MI) WEST FROM CHAMPION. 15.9 KM (9.9 MI) WESTERLY ALONG STATE HIGHWAY 28 FROM THE POST OFFICE IN CHAMPION, IN THE NORTHEASTERN 1/3 OF A 15 BY 53 FOOT EXPOSED AREA OF OUTCROPPING BEDROCK, 35.1 M (115.2 FT) NORTHWEST OF THE EXTENDED CENTER OF OHIO MINE ROAD, 13.4 M (44.0 FT) SOUTHEAST OF THE NORTHWEST END OF THE OUTCROP, AND 11.9 M (39.0 FT) NORTHEAST OF THE CENTERLINE OF THE HIGHWAY. THE MARK IS 0.3 METERS SE FROM A WITNESS POST THE MARK IS 1.2 M ABOVE THE HIGHWAY.
09/20/1999 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1999 RECOVERED IN GOOD CONDITION.

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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