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Details for Benchmark: AQ0254

N 29° 54.600 W 081° 19.217 (NAD 83)

Altitude: 9.22

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

Location:
In ST JOHNS county, FL View Original Datasheet
Designation:
F 141
Marker Type:
bench mark disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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Saw this benchmark while caching in the area.

[Photos:]
photoAQ0254

Found it 4/15/16 at 6:36p. My coords: N29-54.627 W081-19.233

[Photos:]
photoF 141
photoArea photo

Weather cooled down so I went on a benchmark hunting trip.

[Photos:]
photoAQ0254
photoAQ0254 location

Quick find in a cold morning. :-)

[Photos:]
photoimage

I WENT TO LOOK FOR THIS ONE BECAUSE IT IS ON THE SAME STEET THAT I LIVE ON BUT WHARE THE BENCHMARK WAS SUPPOSE TO BE THE BUILDING HAS BEEN GONE FOR TREE YEARS AND THEY BULLDOZE THE HOLE SITE OVER

I see this hasn't been logged in a while. I found this as described, but wished I had taken a picture of it. The benchmark sits right outside the window of a restaurant.

Located as described in good condition, thank the guys who applied the last coat of stucco to the building and didn't cover the marker. Building is now a Tuxedo Rental Store.

Documented History (by the NGS)

01/01/1954 by CGS (MONUMENTED)
01/01/1961 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1961 AT ST AUGUSTINE. AT ST. AUGUSTINE, AT THE INTERSECTION OF SAN MARCO AVENUE AND NELMAR AVENUE, 18 FT. EAST OF THE EAST CURB OF SAN MARCO AVENUE, 11 FT. SOUTH OF THE SOUTH CURB OF NELMAR AVENUE, 1.3 FT. ABOVE THE SIDEWALK, SET VERTICALLY IN THE WEST WALL OF A VACANT WHITE STUCCO BUILDING, 1.5 FT. SOUTH OF THE NORTHWEST CORNER OF THE BUILDING.
01/01/1975 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1975 RECOVERED IN GOOD CONDITION.
01/01/1989 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1989 (JD) RECOVERED IN GOOD CONDITION.
01/01/1989 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1989 (SD) RECOVERED IN GOOD CONDITION.
04/12/1991 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1991 IN SAINT AUGUSTINE, SET VERTICALLY IN THE WEST FACE OF THE STATE IRON AND METAL COMPANY AT 185 SAN MARCO AVENUE, 8.1 M (26.6 FT) SOUTH OF THE CENTER OF NELMAR AVENUE, 0.7 M (2.3 FT) ABOVE THE GROUND SURFACE, AND 0.5 M (1.6 FT) SOUTH OF THE NORTHEAST CORNER OF THE BUILDING.

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. The observed gravity was obtained from relative gravimeter ties to the IGSN71 gravity network.

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