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Details for Benchmark: BL1529

N 30° 10.350 W 095° 59.200 (NAD 83)

Altitude: 300.7

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

Location:
In WALLER county, TX View Original Datasheet
Designation:
N 1030 RESET 1963
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 and in good condition. Made much easier since all the surrounding brush had been cleared.

[Photos:]
photoBL1529 setting
photoBL1529

Documented History (by the NGS)

01/01/1963 by TXHD (MONUMENTED)
DESCRIBED BY TEXAS HIGHWAY DEPARTMENT 1963 6.08 MI E FROM HOWTH. 0.35 MILES NORTH ALONG THE TEXAS AND NEW ORLEANS RAILROAD FROM THE STATION SIGN AT HOWTH, THENCE, 5.73 MILES EAST ALONG FARM ROAD 1736, 48.5 FEET SOUTH OF THE CENTERLINE OF FARM ROAD 1736, 1.5 FEET NORTH OF A FENCE, 2.5 FEET WEST OF A WITNESS POST, AND SET IN THE TOP OF A CONCRETE POST WHICH PROJECTS 0.5 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  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.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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