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Details for Benchmark: AX0220

N 29° 58.150 W 096° 02.450 (NAD 83)

Altitude: 168

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

Location:
In WALLER county, TX View Original Datasheet
Designation:
MONA RM 1
Marker Type:
reference 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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Found for 2006 Benchmark Contest.

[Photos:]
photoDisk Closeup
photoMonument Area

Disk is approx. 1/2 inch below ground level but still visible. No telephone pole E of station any more.

Documented History (by the NGS)

01/01/1954 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1954 10.2 MI S FROM HEMPSTEAD. 2.45 MILES EAST ALONG U.S. HIGHWAY 290 FROM THE COURTHOUSE AT HEMPSTEAD, THENCE 7.75 MILES SOUTH ALONG FARM ROAD 359, 50 FEET EAST OF THE CENTER LINE OF THE FARM ROAD, 14 FEET NORTH OF THE CENTER LINE OF A DRIVEWAY LEADING TO A CHURCH, 61.5 FEET SOUTHWEST OF TRIANGULATION STATION MONA 1954, 2 FEET ABOVE THE LEVEL OF THE ROAD 2 FEET EAST OF A TELEPHONE POLE, SET IN THE TOP OF A CONCRETE POST WHICH PROJECTS 0.3 FOOT ABOVE THE GROUND.

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  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.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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