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Details for Benchmark: AW4721

N 29° 36.400 W 095° 39.800 (NAD 83)

Altitude: 77.54

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

Location:
In FORT BEND county, TX View Original Datasheet
Designation:
Z 804
Marker Type:
bench mark disk
Setting:
abutments and piers of large bridges
Stability:
Probably hold position/elevation well.

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Found it

Recovered as described in good condition.

[Photos:]
photoAW4721
photoAW4721 setting
Nicely marked!

Documented History (by the NGS)

01/01/1943 by CGS (MONUMENTED)
01/01/1973 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1973 1.9 MI W FROM SUGAR LAND. 1.9 MILES WEST ALONG U.S. HIGHWAY 90 ALT. FROM THE JUNCTION OF STATE HIGHWAY SPUR 58 AT SUGAR LAND, 0.2 MILE WEST OF THE JUNCTION OF A ROAD TO A STATE PRISON FARM, IN THE TOP AND 0.7 FOOT SOUTH OF THE NORTH END OF THE EAST CONCRETE ABUTMENT OF THE EASTBOUND LANES BRIDGE OVER BULLHEAD BAYOU, 17 1/2 FEET NORTH OF THE CENTER LINE OF THE EASTBOUND LANES OF THE HIGHWAY, AND ABOUT 1/2 FOOT HIGHER THAN THE HIGHWAY.
01/01/1987 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1987 (GCC) RECOVERED IN GOOD CONDITION.
01/01/1987 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1987 RECOVERED IN GOOD CONDITION.
01/01/1988 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1988 (LT) RECOVERED IN GOOD CONDITION.
01/01/1989 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1989 (MVM) RECOVERED IN GOOD CONDITION.
01/01/1990 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1990 (DB) RECOVERED IN GOOD CONDITION.
12/04/1993 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1993 RECOVERED IN GOOD CONDITION.
11/21/1998 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1998 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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