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Details for Benchmark: AW1908

N 29° 58.850 W 095° 48.517 (NAD 83)

Altitude: 179.77

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

Location:
In HARRIS county, TX View Original Datasheet
Designation:
R 1009
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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Recovered as described in good condition.

[Photos:]
photoAW1908
photoAW1908 setting

found easily. marked (with a stake labeled RM2, interestingly enough) and flagged recently.

Documented History (by the NGS)

01/01/1954 by CGS (MONUMENTED)
01/01/1973 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1973 4.7 MI SE FROM HOCKLEY. ABOUT 2 MILES SOUTHEAST ALONG US HIGHWAY 290 FROM THE JUNCTION OF US HIGHWAY 290 AND HEGAR RD., THENCE 2.7 MILES SOUTH ALONG KATY-HOCKLEY RD., 37.6 FEET EAST OF THE CENTER LINE OF THE ROAD, 15.6 FEET NORTH OF THE CENTER LINE OF A PRIVATE ROAD LEADING EAST, 7.7 FEET EAST OF A NORTH-SOUTH FENCE, 1.6 FEET SOUTH OF AN EAST-WEST FENCE, 1/2-FOOT BELOW THE LEVEL OF THE ROAD, AND SET IN THE TOP OF A CONCRETE POST PROJECTING 0.2 FOOT.
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.
01/01/1987 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1987 (MM) RECOVERED IN GOOD CONDITION.
01/01/1987 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1987 (MGB) RECOVERED IN GOOD CONDITION.
11/06/1993 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1993 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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