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Details for Benchmark: BM0443

N 30° 01.233 W 097° 16.850 (NAD 83)

Altitude: 372.9

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

Location:
In BASTROP county, TX View Original Datasheet
Designation:
G 806
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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Found in good condition during a 13 hour benchmark hunting day...
Corrected coordinates:
N 30 1.263 W 97 16.929

[Photos:]
photoBM0443
photoBM0443 setting

Documented History (by the NGS)

01/01/1953 by CGS (MONUMENTED)
01/01/1973 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1973 7.0 MI SE FROM BASTROP. ABOUT 7.0 MILES SOUTHEAST ALONG THE MISSOURI, KANSAS AND TEXAS RAILROAD FROM THE STATION AT BASTROP ABOUT 0.15 MILES SOUTHEAST OF A TRESTLE, 143.0 FEET WEST OF AND ACROSS THE TRACK FROM MILEPOST 961, 46.0 FEET SOUTHWEST OF THE SOUTHWEST TRACK, 41.5 FEET NORTHEAST OF THE CENTER LINE OF THE FARM ROAD 2571, 8.5 FEET SOUTHWEST OF A TELEPHONE POLE, 1730 ON TOP OF A LOW BANK CUT, 3.0 FEET ABOVE THE ROAD, 0.7 FEET NORTHEAST OF A METAL WITNESS POST AND IS A DISK IN THE TOP OF A CONCRETE POST PROJECTING ABOUT 5-IN.
01/01/1978 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978 RECOVERED IN GOOD CONDITION.

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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