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Details for Benchmark: AW6880

N 29° 20.302 W 095° 51.377 (NAD 83)

Altitude: 74.3

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

Location:
In FORT BEND county, TX View Original Datasheet
Designation:
TT 18 WWF USGS 1953
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:]
photoAW6880
photoAW6880 setting

Documented History (by the NGS)

01/01/1953 by USGS (MONUMENTED)
DESCRIBED BY US GEOLOGICAL SURVEY 1953 B.M. TT18 WWF (USGS) WAS USED AS THE AZIMUTH MARK AND A TRAVERSE CONNECTION WAS MADE. IT IS A STANDARD U.S.G.S. BENCH MARK DISK SET IN A 6 INCH CIRCULAR CONCRETE POST, 69.5 FEET SOUTH OF THE CENTER OF FARM ROAD NO. 442, 60.3 FEET EAST OF THE CENTER OF A CHURCHYARD DRIVEWAY, 18.0 FEET SOUTH OF A FENCE CORNER AND 1.0 FOOT WEST OF A FENCE. IT PROJECTS 6 INCHES AND IS STAMPED TT 18 WWF 1951. TO REACH THE STATION FROM THE RAILROAD DEPOT IN BOLING, GO SMALL WHITE CHURCH ON THE RIGHT.
01/10/1998 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1998 RECOVERED IN GOOD CONDITION.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in February 1996.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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