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Details for Benchmark: AW4172

N 29° 21.283 W 095° 47.017 (NAD 83)

Altitude: 76.14

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

Location:
In FORT BEND county, TX View Original Datasheet
Designation:
Y 1214
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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N 29° 21.306 W 095° 47.082

Pictures & coordinates accompany

[Photos:]
photoThe Mark
photoWide View
photoFrom Above

Found it

Recovered as described in good condition.

[This entry was edited by Doc Geo on Monday, June 04, 2007 at 8:23:06 AM.]

[Photos:]
photoAW4172
photoAW4172 setting

Documented History (by the NGS)

01/01/1973 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1973 0.6 MI NW FROM GUY. 0.6 MILE NORTHWEST ALONG STATE HIGHWAY 36 FROM THE JUNCTION OF FARM ROAD 1994 AT GUY, 0.3 MILE NORTHWEST OF THE CROSSING OF THE ATCHISON, TOPEKA AND SANTA FE RAILWAY, IN THE TOP AND 1.5 FEET NORTHWEST OF THE SOUTHEAST END OF THE SOUTHWEST CONCRETE HEAD WALL OF A LARGE CONCRETE BOX CULVERT, 25 FEET SOUTHWEST OF THE CENTER LINE OF THE HIGHWAY, 61 FEET NORTHWEST OF THE EXTENDED CENTER LINE OF A DRIVEWAY TO A HOUSE AT 17915 STATE HIGHWAY 36, AND ABOUT 1/2 FOOT LOWER THAN THE HIGHWAY.
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 (PRH) RECOVERED IN GOOD CONDITION.
01/01/1989 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1989 (MAR) RECOVERED IN GOOD CONDITION.
10/22/1994 by USPSQD (MARK NOT FOUND)
RECOVERY NOTE BY US POWER SQUADRON 1994 MARK NOT FOUND.

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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