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Details for Benchmark: AW5470

N 29° 36.333 W 095° 38.067 (NAD 83)

Altitude: 79.64

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

Location:
In FORT BEND county, TX View Original Datasheet
Designation:
C 1505
Marker Type:
metal rod
Setting:
stainless steel rod
Stability:
Probably hold position/elevation well.

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No cap or collar with stamping was found. The rod has been hit with something and bent over. Part of the concrete is broken off and missing. Not sure if this should be logged as poor condition or destroyed. Edited to mark destroyed.

[This entry was edited by Doc Geo on Monday, June 04, 2007 at 12:58:38 PM.]

[Photos:]
photoAW5470

2:45 PM. I looked around the location my GPS and the benchmark description directed me. I located the telephone junction box, power pole with guy wires, guard rail. I could not even find the witness post. The location of where this benchmark should be is 9.0 miles from my home in Rosenberg, TX at a bearing of 62 by my GPS.

Documented History (by the NGS)

01/01/1987 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1987 1.3 KM (0.8 MI) SOUTH FROM SUGARLAND. 1.3 KM (0.8 MI) SOUTH ALONG STATE HIGHWAY 58 SPUR FROM THE JUNCTION OF US HIGHWAY 90 ALTERNATE IN SUGARLAND, AT A POWERLINE CROSSING, 14.6 METERS (47.8 FT) EAST OF THE CENTERLINE OF THE HIGHWAY, ABOUT 17.1 METERS (56 FT) SOUTH OF THE SOUTH EDGE OF A CANAL, 18.3 METERS (60.0 FT) SOUTH-SOUTHEAST OF THE SOUTHERNMOST METAL GUARD RAIL POST, 11.1 METERS (36.5 FT) WEST-NORTHWEST OF A TELEPHONE JUNCTION BOX, 6.4 METERS (21.0 FT) SOUTH OF THE CENTER OF A LOW LEVEE, 0.7 METER (2.3 FT) WEST OF A GUYED POWER POLE. NOTE--ACCESS TO DATUM POINT IS HAD THROUGH A 5-INCH LOGO CAP. THE MARK IS 0.6 METERS W FROM A WITNESS POST
01/01/1987 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1987 (PT) RECOVERED IN GOOD CONDITION.
01/01/1987 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1987 (GCC) RECOVERED IN GOOD CONDITION.
01/01/1989 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1989 (JLH) RECOVERED IN GOOD CONDITION.
02/28/1998 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1998 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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