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Details for Benchmark: BM0821

N 30° 19.217 W 097° 42.767 (NAD 83)

Altitude: 670.39

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

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

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Found for my 6th period CEA class

Found this benchmark for Mrs. Windolph's 4th period CEA class!

Our 24th benchmark!

[Photos:]
photo

Windolph 5 period Samuel Santos

Made the spot after a quick walk.

Easy to find. A short walk from the apparently unoccupied business on the corner.

[Photos:]
photoBM0821 - Disk
photoBM0821 - Setting

Found it easily. The hardest part was finding a place to park nearby.

[Photos:]
photoBM0821
N 30° 19.234 W 097° 42.751

Recovered as described in good condition.

[Photos:]
photoBM0821
Benchmark set vertically
photoBM0821 location
In vertical post

Easily found and in good condition. See picture.

[Photos:]
photoBM0821 in good condition
photoBM0821 setting

Found in good condition as described in 1996.

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 RANCH ROAD 2222, AIRPORT BOULEVARD, AND U.S. HIGHWAY 290, SET VERTICALLY IN THE NORTHWEST FACE OF THE NORTHEASTERNMOST SQUARE PIER OF THE HIGHWAY 290 OVERPASS OVER AIRPORT BOULEVARD, 14.0 METERS (46.0 FT) NORTHEAST OF THE CENTERLINE OF THE BOULEVARD, 2.9 METERS (9.6 FT) NORTHEAST OF A METAL GUARDRAIL, 1.0 METER (3.4 FT) SOUTHEAST OF A METAL GUARDRAIL. NOTE-BRIDGE PIERS ARE DRILLED INTO HARD LIMESTONE AND AUSTIN CHALK. THE MARK IS 1.8 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 U.S. HIGHWAY 290 AND AIRPORT BOULEVARD, SET VERTICALLY IN THE NORTH FACE OF THE MOST NORTHERLY OF 2 CONCRETE COLUMNS OF THE 1ST PIER WEST OF THE EAST ABUTMENT OF THE HIGHWAY OVERPASS OF THE BOULEVARD, 14.0 M (45.9 FT) EAST OF THE CENTER OF THE BOULEVARD, 5.0 M (16.4 FT) NORTH 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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