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Details for Benchmark: SQ0430

N 47° 33.850 W 107° 52.100 (NAD 83)

Altitude: 2358.03

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

Location:
In PHILLIPS county, MT View Original Datasheet
Designation:
N 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. Broken post with cementing material found along the SE side of the center triangle of the road intersections.

[Photos:]
photoSQ0430 N 277 1935
POST PORTION ONLY
photoSQ0430 N
LOOKING ACROSS DRY LAKE WHICH MARKS THE NORTHERN EXTREMITY OF THE UL BEND IN THE MISSOURI RIVER.

Documented History (by the NGS)

01/01/1935 by CGS (MONUMENTED)
01/01/1965 by USGS (GOOD)
DESCRIBED BY US GEOLOGICAL SURVEY 1965 5.1 MI S FROM MARTIN MATOVICH RANCH. 5.1 MILES SOUTH ALONG A DIRT ROAD FROM THE MARTIN MATOVICH RANCH ACROSS A DRY LAKE BED TO THE WEST SIDE, 35 FEET SOUTH OF A ROAD Y WEST AND 36 FEET FROM THE CENTERLINE OF THE SOUTH ROAD EAST A STANDARD DISK STAMPED N277 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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