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Details for Benchmark: SQ0429

N 47° 34.800 W 107° 53.017 (NAD 83)

Altitude: 2392.8

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

Location:
In PHILLIPS county, MT View Original Datasheet
Designation:
M 277
Marker Type:
bench mark disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

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POOR condition. Several pieces of a broken post found, but the disk is missing.

[Photos:]
photoSQ0429 POST CHUNKS
photoSQ0429 WNW

Documented History (by the NGS)

01/01/1935 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1935 4.9 MI NW FROM LEGG. 4.9 MILES NORTHWEST ALONG THE WILDER ROAD FROM LEGG, PHILLIPS COUNTY, 0.1 MILE EAST OF THE JUNCTION OF A T-ROAD LEADING NORTHWEST, AT THE CREST OF A RISE, AND 30 FEET SOUTH OF THE CENTERLINE OF THE ROAD. A STANDARD DISK, STAMPED M 277 1935 AND SET IN THE TOP OF A CONCRETE POST.

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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