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Details for Benchmark: GG0400

N 36° 20.283 W 095° 36.867 (NAD 83)

Altitude: 627.25

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

Location:
In ROGERS county, OK View Original Datasheet
Designation:
T 17
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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The marker looks just as it did in 2005.

Found bench mark as described. Looks like someone was doing some serious surveying recently as "BM" with an arrow was painted on the road, and there was a red flag in the tree by the mark.

This 70-year old brass disk has seen better days. About 70% is missing, probably hit by a mower. There is no witness post. Not too hard to get to. Better position: 36°20.287 95°36.900

[Photos:]
photoBenchmark gg0400 - The Disk
photoBenchmark gg0400 - The Area

Documented History (by the NGS)

01/01/1933 by CGS (MONUMENTED)
01/01/1960 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1960 2 MI N FROM CLAREMORE. 2.0 MILES NORTH ALONG THE MISSOURI PACIFIC RAILROAD FROM THE STATION AT CLAREMORE, ROGERS COUNTY, ABOUT 1.2 MILES NORTH OF THE JUNCTION OF THE ST. LOUIS-SAN FRANCISCO RAILWAY, ABOUT 17 POLES NORTH OF MILEPOST 611, 63 FEET WEST OF THE CENTER LINE OF A COUNTY ROAD PARALLELING THE TRACK, AND 45 FEET EAST OF THE EAST RAIL. A STANDARD DISK, STAMPED T 17 1933 AND SET IN THE TOP OF A CONCRETE POST PROJECTING ABOUT 6 INCHES ABOVE GROUND.

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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