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Details for Benchmark: AX0041

N 29° 51.250 W 096° 20.783 (NAD 83)

Altitude: 304.28

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

Location:
In AUSTIN county, TX View Original Datasheet
Designation:
H 767
Marker Type:
bench mark disk
Setting:
retaining walls, concrete ledge, etc.
Stability:
May hold, but of type commonly subject to surface motion.

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Recovered as described in good condition.

[Photos:]
photoAX0041 setting
photoAX0041

Documented History (by the NGS)

01/01/1943 by CGS (MONUMENTED)
01/01/1973 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1973 1.35 MI W FROM CAT SPRING. 1.35 MILES WEST ALONG THE MISSOURI-KANSAS-TEXAS RAILROAD FROM THE CROSSING OF FARM ROAD 949 AT CAT SPRING, 7 1/2 POLES WEST OF MILE POLE 1023, 300 FEET WEST OF A DIRT ROAD CROSSING, 1/2 POLE EAST OF THE 3RD TELEPHONE POLE WEST OF THE ROAD CROSSING, IN THE TOP AND 0.8 FOOT WEST OF THE EAST END OF THE NORTH CONCRETE HEADWALL OF A LARGE ARCH RAILROAD CULVERT, 10.2 FEET NORTH OF THE NORTH RAIL, AND ABOUT 1 FOOT LOWER THAN THE TRACK.
01/01/1976 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1976 RECOVERED IN GOOD CONDITION.
01/01/1976 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1976 RECOVERED IN GOOD CONDITION.
01/01/1978 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978 RECOVERED IN GOOD CONDITION.
01/01/1986 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1986 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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