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Details for Benchmark: BL1644

N 30° 00.300 W 095° 48.883 (NAD 83)

Altitude: 203.61

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

Location:
In HARRIS county, TX View Original Datasheet
Designation:
E 1216
Marker Type:
bench mark disk
Setting:
a metal rod driven into the ground
Stability:
Mark of questionable or unknown stability.

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Found for 2006 Benchmark Contest.

[Photos:]
photoDisk Closeup
photoDisk Area

Mark was buried under about 1 inch of soil and it appeared the original witness post (actually a metal fence post) was broken off when new fencing was installed. Re-flagged new fence post that is offset about 1 1/2 inch from original witness post.

Submitted to NGS:
Mark found buried 1 inch below ground level. Witness post was missing. New fence has been installed along this road. Flagged new metal fence post as a witness post that is offset 1 1/2 inches from original witness post.

Documented History (by the NGS)

01/01/1953 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1953 2.7 MI SE FROM HOCKLEY. ABOUT 2 MILES SOUTHEAST ALONG US HIGHWAY 290 FROM THE JUNCTION OF US HIGHWAY 290 AND HEGAR RD., THENCE 0.7 MILE SOUTH ALONG KATY-HOCKLEY RD., 41.6 FEET NORTH OF A POWER POLE, 28.5 FEET EAST OF THE CENTER LINE OF THE ROAD, 0.6 FOOT WEST OF A FENCE, 0.8 FOOT SOUTH OF A METAL WITNESS POST, ABOUT LEVEL WITH THE ROAD, AND IS A DISK SET ON TOP OF A 4-FOOT LENGTH OF 5/8-INCH COPPER COATED STEEL ROD, AND PROTECTED BY A 6-INCH METAL PIPE WHICH PROJECTS 0.1 FOOT.
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.
01/01/1987 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1987 (MM) RECOVERED IN GOOD CONDITION.
03/26/1994 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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