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Details for Benchmark: AW4550

N 29° 52.467 W 095° 47.417 (NAD 83)

Altitude: 154.62

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

Location:
In HARRIS county, TX View Original Datasheet
Designation:
BL 228 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:]
photoAW4550
photoAW4550 setting
photoAW4550 setting

Documented History (by the NGS)

01/01/1967 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1967 8.2 MI NE FROM KATY. ABOUT 0.2 MILE WEST FROM THE POST OFFICE IN KATY TO D-AVENUE, THENCE 1.9 MILES NORTH ALONG D-AVENUE, THENCE 4.1 MILES NORTH ALONG THE KATY-HOCKLEY ROAD, THENCE 2.0 MILES EAST ALONG F.M. HIGHWAY 529 TO SITE OF BENCH MARK, 72 FEET SOUTH OF THE CENTER LINE OF THE HIGHWAY, 18 FEET WEST OF THE EXTENDED CENTER LINE OF PORTER ROAD, 12 FEET SOUTH OF THE RIGHT-OF-WAY FENCE, 1 FOOT EAST OF A NORTH-SOUTH FENCE LINE, 1 FOOT SOUTH OF A METAL WITNESS POST, AND AT TEXAS HIGHWAY DEPARTMENT 701 + 49. A C AND GS BENCH MARK DISK, SET IN A 12 X 12 IN. CONCRETE POST WHICH PROJECTS 5 INCHES ABOVE THE SURFACE OF GROUND.
01/01/1971 by USGS (MARK NOT FOUND)
RECOVERY NOTE BY US GEOLOGICAL SURVEY 1971 MARK NOT FOUND.
01/01/1978 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978 RECOVERED IN GOOD CONDITION.
01/01/1986 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1986 RECOVERED IN GOOD CONDITION WITH THE FOLLOWING EXCEPTIONS. DELETE--12 FEET SOUTH OF THE RIGHT-OF-WAY FENCE, AND 1 FOOT EAST OF A NORTH-SOUTH FENCE LINE.
01/01/1987 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1987 (BB) RECOVERED IN GOOD CONDITION.
01/01/1987 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1987 (MVM) RECOVERED IN GOOD CONDITION.
07/10/1987 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1987 (WVM) RECOVERED IN GOOD CONDITION.
01/01/1990 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1990 (WHA) RECOVERED IN GOOD CONDITION.
06/25/1994 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1994 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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