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Details for Benchmark: SR0059

N 47° 35.700 W 108° 02.033 (NAD 83)

Altitude: 2223.46

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

Location:
In PHILLIPS county, MT View Original Datasheet
Designation:
4 CAP
Marker Type:
cap-and-bolt pair
Setting:
set into the top of a metal pipe driven into the ground
Stability:
Mark of questionable or unknown stability.

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Didn't find it; but these double PID's for the same station don't make sense for what must be a standard MORC combination of a quarried underground stone, four feet of four inch heavy-walled stand pipe topped off with the distinctive Bench Mark cap with a raised round button affixed to the top of the pipe with a through and through cross bolt.

The 1965 crew had a NOT FOUND recovery for this BOLT and no history for the CAP.

The published L/L for this set puts them near the toe of the bluffs about 0.60 mi NW of the original Army numbers adjusted with a correction factor that has been working all the way down from Fort Benton; and which matches the original call of 800 feet from the foot of the bluffs. Didn't find it there either - high and dry at this reservoir level but in heavy vegetation and maybe under several feet of silt.

Documented History (by the NGS)

Unknown by MORC (MONUMENTED)
01/01/1935 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1935 13.1 MI W FROM LEGG. 13.1 MILES WEST ALONG THE WILDER ROAD FROM LEGG, PHILLIPS COUNTY, 0.8 MILE NORTHEAST OF A FARMHOUSE, AND 78 FEET SOUTH OF THE CENTERLINE OF THE ROAD. A MISSOURI RIVER COMMISSION STANDARD CAP, FASTENED ON THE TOP OF AN IRON PIPE.

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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