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Details for Benchmark: AW0380

N 29° 49.683 W 095° 13.183 (NAD 83)

Altitude: 37.4

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

Location:
In HARRIS county, TX View Original Datasheet
Designation:
G 1020
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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Well, I agree, POOR condition. It looks like someone hacked at it with a hatchet. I have included a pic of the disk.

[Photos:]
photoDamaged AW0380
photoAW0380 setting

Documented History (by the NGS)

01/01/1954 by CGS (MONUMENTED)
01/01/1972 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1972 6.25 MI SW FROM SHELDON. ABOUT 6.25 MILES SOUTHWEST ALONG US HIGHWAY 90 FROM THE INTERSECTION OF SHELDON ROAD, SET IN THE TOP OF THE SOUTH END OF THE EAST CONCRETE HEADWALL OF A 24-INCH PIPE CULVERT UNDER A PRIVATE ROAD LEADING SOUTHEAST TO THE HOUSTON LIGHTING AND POWER COMPANY, 51 FEET SOUTHEAST OF THE CENTER LINE OF THE HIGHWAY, 23.8 FEET NORTHEAST OF THE CENTER LINE OF THE PRIVATE ROAD, 7 FEET WEST OF POWER POLE 12200, 1.1 FEET NORTH OF THE SOUTH END OF THE EAST HEADWALL, AND 0.5 FOOT ABOVE THE LEVEL OF THE HIGHWAY.
01/01/1978 by NGS (POOR)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978 MARK RECOVERED IN POOR CONDITION.
01/01/1983 by NGS (POOR)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1983 RECOVERED IN POOR CONDITION, THE STAMPING IS ILLEGIBLE.
01/01/1986 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1986 RECOVERED IN GOOD CONDITION.
01/01/1987 by USPSQD (POOR)
RECOVERY NOTE BY US POWER SQUADRON 1987 (LD) MARK RECOVERED IN POOR CONDITION.
01/01/1988 by USPSQD (POOR)
RECOVERY NOTE BY US POWER SQUADRON 1988 (CD) MARK RECOVERED IN POOR CONDITION.
09/11/1994 by USPSQD (POOR)
RECOVERY NOTE BY US POWER SQUADRON 1994 MARK RECOVERED IN POOR 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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