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Details for Benchmark: BM0673

N 30° 12.100 W 097° 38.250 (NAD 83)

Altitude: 453.1

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

Location:
In TRAVIS county, TX View Original Datasheet
Designation:
W 1221
Marker Type:
bench mark disk
Setting:
copper-clad steel rod
Stability:
Probably hold position/elevation well.

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So that's a hackberry tree! Found, in good condition, at night on the way home.

[Photos:]
photoBM0673
photoBM0673
photoBM0673
N 30° 12.114 W 097° 38.267

Recovered as described in good condition.

TxHiPowr

Documented History (by the NGS)

01/01/1973 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1973 1.45 MI SE FROM DEL VALLE. ABOUT 1.45 MILES SOUTHEAST ALONG STATE HIGHWAY 71 FROM THE MAIN ENTRANCE AND PRESIDENTIAL BLVD. UNDERPASS TO THE BERGSTROM AIRFORCE BASE AT DEL VALLE, 165.0 FEET NORTHEAST OF THE NORTH CORNER OF LA MAR SCHOOL WHICH IS A BRICK BUILDING, 123.0 FEET EAST OF THE CENTER LINE OF FARM ROAD 973, 85.5 FEET SOUTHWEST OF THE CENTER LINE OF THE SOUTHWEST LANE OF ST HIGHWAY 71, 6.4 FEET EAST OF THE EAST CORNER OF A SIDEWALK, 4.5 FEET EAST OF A 24-INCH HACKBERRY TREE, 3.5 FEET NORTHWEST OF A POWER POLE, 0.6 MILES SOUTHEAST OF V 1221, 1.3 FEET SOUTHWEST OF A METAL WITNESS POST AND IS A DISK ON TOP OF A COPPER COATED STEEL ROD FLUSH WITH THE GROUND PROTECTED BY A 6-INCH IRON PIPE. THE ROD WAS DRIVEN TO A REFUSAL OF 16.0 FEET.
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 (CGG) RECOVERED IN GOOD CONDITION.
01/01/1989 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1989 (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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