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Details for Benchmark: SQ0428

N 47° 35.150 W 107° 54.567 (NAD 83)

Altitude: 2384.89

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

Location:
In PHILLIPS county, MT View Original Datasheet
Designation:
L 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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A few broken posts and stubs remain of the fence.

This entry was edited by kayakbird on Tuesday, 08 June 2010 at 10:39:47.

[Photos:]
photoSQ0428 L 277 1935
photoSQ0428 E
photoSQ0428 W

Documented History (by the NGS)

01/01/1935 by CGS (MONUMENTED)
01/01/1965 by USGS (GOOD)
DESCRIBED BY US GEOLOGICAL SURVEY 1965 6.2 MI NW FROM LEGG. 2.1 MILES SOUTHEAST OF THE LOCKE RANCH, PHILLIPS COUNTY, IN THE NORTHEAST CORNER OF SECTION 18, TOWNSHIP 21 NORTH, RANGE 30 EAST, AT THE SOUTH EDGE OF HAWLEY FLAT ALONG A ABANDONED FENCE LINE. A STANDARD DISK STAMPED L 277 1965 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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