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Details for Benchmark: AW4690

N 29° 38.017 W 095° 49.017 (NAD 83)

Altitude: 94.56

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

Location:
In FORT BEND county, TX View Original Datasheet
Designation:
L 806 RESET
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:]
photoAW4690
photoAW4690 setting

Documented History (by the NGS)

01/01/1963 by CGS (MONUMENTED)
01/01/1973 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1973 5.65 MI N FROM ROSENBERG. 0.25 MILE WEST ALONG THE ATCHISON, TOPEKA AND SANTA FE RAILWAY FROM THE STATION AT ROSENBERG, THENCE 4.95 MILES NORTH ALONG FARM ROAD 723, THENCE 0.45 MILE NORTHWEST ALONG FARM ROAD 359, AT THE CROSSING OF A STEEL TOWER POWER TRANSMISSION LINE, 50 FEET SOUTHWEST OF THE CENTER LINE OF THE ROAD, 62.5 FEET NORTH-NORTHEAST OF THE EAST LEG OF THE FIRST STEEL TOWER SOUTHWEST OF THE ROAD, 40 1/2 FEET SOUTHEAST OF THE SOUTHEAST END OF A METAL GATE, 2 1/2 FEET NORTHWEST OF A T JUNCTION FENCE POST, 2 1/2 FEET SOUTHWEST OF A POWER POLE, 0.6 FOOT SOUTHWEST OF THE FENCE, 1.0 FOOT SOUTHWEST OF A WITNESS POST, ABOUT LEVEL WITH THE ROAD, AND SET IN THE TOP OF A CONCRETE POST PROJECTING 0.3 FOOT ABOVE THE GROUND.
01/01/1986 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1986 RECOVERED IN GOOD CONDITION.
01/01/1990 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1990 (DB) RECOVERED IN GOOD CONDITION.
01/08/1995 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1995 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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