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Details for Benchmark: SR0050

N 47° 35.417 W 108° 11.867 (NAD 83)

Altitude: 2256.61

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

Location:
In PHILLIPS county, MT View Original Datasheet
Designation:
1 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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Found the pipe with a quarried stone at the bottom. 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 GOOD recovery for this BOLT and no history for the CAP.

The published L/L for this set puts them 400 feet NE of the original Army numbers adjusted with a correction factor that has been working all the way down from Fort Benton.

[This entry was edited by kayakbird on Wednesday, September 30, 2009 at 9:11:41 PM.]

[This entry was edited by kayakbird on Wednesday, September 30, 2009 at 9:13:51 PM.]

[Photos:]
photoSR0050 MORC BM 62-2
STAND PIPE AT THE ADJUSTED L/L
photoSR0050 SW
MARK IS AT THE RIVER LEFT FULL POOL WAVE ACTION ERODING BANK

Documented History (by the NGS)

Unknown by MORC (MONUMENTED)
01/01/1935 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1935 29.8 MI NE FROM WILDER. IN PHILLIPS COUNTY, 12.5 MILES NORTH ALONG THE ZORTMAN ROAD FROM WILDER, FERGUS COUNTY, 17.3 MILES EAST ALONG THE LEGG ROAD. 0.5 MILE WEST OF A FORD THROUGH A WASH, 200 FEET EAST OF A GRADE LEADING INTO THE RIVER BOTTOM, AND 10 FEET NORTH OF THE CENTERLINE OF THE ROAD. A MISSOURI RIVER COMMISSION STANDRD CAP, FASTENED ON THE E 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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