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Details for Benchmark: BM0080

N 30° 08.317 W 096° 04.400 (NAD 83)

Altitude: 262.8

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

Location:
In WALLER county, TX View Original Datasheet
Designation:
A 207
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 for 2007 benchmark hunting contest.

[Photos:]
photoBM0080
photoBM0080 setting

Found for 2006 Benchmark Contest.

[Photos:]
photoDisk Closeup
photoMonument Area

Found easily 1 foot west of a witness post, 2 feet west of fence. Mark projects about 1 foot.
n30 08 19.5 w096 04 31.1

[Photos:]
photoCloseup
photoArea photo looking south
photoMark and witness post

Documented History (by the NGS)

01/01/1933 by CGS (MONUMENTED)
01/01/1954 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1954 1.4 MI S FROM HOWTH. 1.4 MILES SOUTH ALONG THE TEXAS AND NEW ORLEANS RAILROAD FROM THE STATION SIGN AT HOWTH, 0.5 MILE NORTH OF MILEPOST 53, 50 FEET SOUTHEAST OF THE CENTER LINE OF A GRAVELED ROAD, 46 FEET EAST OF THE EAST RAIL, 14 FEET SOUTH OF A FENCE CORNER, 1 FOOT WEST OF A FENCE, 3 FEET SOUTH OF A WITNESS POST, SET IN THE TOP OF A CONCRETE POST WHICH PROJECTS 0.7 FOOT ABOVE THE GROUND.
07/14/1991 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1991 (RAL) RECOVERED IN GOOD CONDITION.

Control Text

  • The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.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 geoid height was determined by GEOID99.

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