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Details for Benchmark: BM0822

N 30° 18.100 W 097° 42.917 (NAD 83)

Altitude: 610.04

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

Location:
In TRAVIS county, TX View Original Datasheet
Designation:
R 1306
Marker Type:
vertical control disk
Setting:
abutments and piers of large bridges
Stability:
Probably hold position/elevation well.

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Woo hoo! Our 75th benchmark

[Photos:]
photo

Tough to find a place to park nearby, but mark is still visible through the paint

[Photos:]
photoBM0822 - Disk
photoBM0822 - Setting

Mark is still there as described, and still obscured by paint.

[Photos:]
photoBM0822
photoBM0822 setting
photoBM0822 location

As mentioned before, painted over with a textured paint and barely readable. See picture.

[Photos:]
photoPainted over BM0822
photoBM0822 setting

The structure of the bridge has not changed so the description in the Official history is still accurate. However, the marker itself has been sprayed over with a textured paint (anti-graffiti) which makes it difficult to read.

N 30° 18.125 W 097° 42.930

the hard part is not finding this one, but figuring out where to park your car...

Documented History (by the NGS)

01/01/1980 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1980 IN AUSTIN. IN AUSTIN, AT THE JUNCTION OF INTERSTATE 35 SOUTHBOUND AND AIRPORT BOULEVARD, SET VERTICALLY IN THE NORTHWEST FACE OF THE NORTHWESTERNMOST PIER OF THE FIRST ROW OF PIERS SOUTH OF AIRPORT BOULEVARD WHICH SUPPORT THE INTERSTATE 35 SOUTHBOUND OVERPASS, 7.8 METERS (25.7 FT) SOUTH OF THE CENTERLINE OF THE EASTBOUND LANE OF THE BOULEVARD, 9.3 METERS (30.6 FT) SOUTHEAST OF A HIGHWAY SIGN FOR INTERSTATE 35, LOOP 111 AND U.S. HIGHWAY 290 EAST. NOTE-BRIDGE PIERS ARE DRILLED INTO AUSTIN CHALK. THE MARK IS 1.5 M ABOVE THE GROUND.
01/01/1990 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1990 (GGB) RECOVERED IN GOOD CONDITION.
07/19/1991 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1991 (GGB) RECOVERED IN GOOD CONDITION.
11/20/1996 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1996 (GAS) IN AUSTIN, AT THE INTERSECTION OF INTERSTATE HIGHWAY 35 AND AIRPORT BOULEVARD, SET VERTICALLY IN THE NORTH FACE OF THE MOST NORTHWESTERLY OF 2 CONCRETE COLUMNS OF THE CENTER PIER OF THE HIGHWAY SOUTHBOUND OFF RAMP OVERPASS OF THE BOULEVARD, 7.8 M (25.6 FT) EAST OF THE CENTERLINE OF THE EASTBOUND LANES OF THE BOULEVARD, 3.6 M (11.8 FT) WEST OF THE CENTER OF THE HIGHWAY, AND 1.5 M (4.9 FT) ABOVE THE LEVEL OF THE BOULEVARD.

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.
  • 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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