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Details for Benchmark: BM0666

N 30° 11.017 W 097° 32.633 (NAD 83)

Altitude: 438.17

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

Location:
In TRAVIS county, TX View Original Datasheet
Designation:
D 1225
Marker Type:
bench mark disk
Setting:
a metal rod with base plate buried/screwed into the ground
Stability:
May hold, but of type commonly subject to surface motion.

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My wife wasn't sure about going after one numbered 666 at night, but it was no problem at all...

[Photos:]
photoThe anti-benchmark...
photoBM0666 setting

Documented History (by the NGS)

01/01/1973 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1973 1.0 MI E FROM GARFIELD. ABOUT 1.0 MILES EAST ALONG STATE HIGHWAY 71 FROM A GULF SERVICE STATION AND STORE AT GARFIELD, 0.75 MILES EAST OF GARFIELD WATER TOWER ON A HILL 93 YARDS (P) EAST OF THE NORTHEAST CORNER OF A TIN FRAMED BUILDING WHICH IS A TEXACO SERVICE STATION, 60.0 FEET SOUTH OF THE CENTER LINE OF THE SOUTH LANE OF THE HIGHWAY, 84.5 FEET NORTHEAST OF THE NORTHEAST CORNER OF A FRAME HOUSE OF JAMES FORADORY, 29.5 FEET NORTHEAST OF A POWER POLE BRACED BY 2 GUY WIRES, THE MARK WILL BE INSIDE OF A FENCE CORNER LATER ON, 0.75 MILES EAST OF THE BENCH MARK C 1225, 0.8 FEET SOUTH OF A METAL WITNESS POST AND IS A DISK ON TOP OF A 4-FOOT LENGTH OF COPPER COATED STEEL ROD FLUSH WITH THE GROUND AND FASTENED TO A BASE PLATE. THE MARK IS PROTECTED BY A 6-INCH IRON PIPE WHICH PROJECTS 4-INCHES.
01/01/1978 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978 RECOVERED IN GOOD CONDITION.
01/01/1989 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1989 (CAG) RECOVERED IN GOOD CONDITION.
01/01/1990 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1990 (CAG) RECOVERED IN GOOD CONDITION.
01/01/1991 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1991 (CAG) RECOVERED IN GOOD CONDITION.
07/18/1998 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. WARNING-Repeat measurements at this control monument indicate possible vertical movement.
  • 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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