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Details for Benchmark: AX0193

N 29° 40.217 W 096° 01.283 (NAD 83)

Altitude: 118.5

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

Location:
In AUSTIN county, TX View Original Datasheet
Designation:
S 806
Marker Type:
bench mark disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

Must Read!

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I walked across the bridge over the river and back before I found this disc on the side that I had started on.... It was a bit scary... This bridge has not been used for a long time and looks like it might be torn down soon... Benchmark was recovered in very good condition though.

[Photos:]
photoAX0193
photoWorried wife
I had left my wife in the truck but found her waiting for me on my return across the bridge.
photoAX0193 setting
Shown from wife's location

Documented History (by the NGS)

01/01/1943 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1943 2.65 MI SW FROM SIMONTON. TO REACH FROM THE TEXAS AND NEW ORLEANS (SOUTHERN PACIFIC) RAILROAD STATION AT SIMONTON-- PROCEED 2.65 MILES WESTERLY ALONG THE RAILROAD TO SITE OF BENCH MARK. BENCH MARK IS SET HORIZONTALLY IN THE SOUTHEAST END OF THE SOUTHWEST CONCRETE PIER OF A LARGE STEEL RAILROAD BRIDGE OVER BRAZOS RIVER. IT IS ABOUT 40.0 FEET SOUTHWEST OF MILEPOST 41, AND 9.0 FEET SOUTHEAST OF AND ABOUT 7.5 FEET BELOW THE SOUTHEAST RAIL OF TRACK. A STANDARD DISK, STAMPED S 806 1943.

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  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.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