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Details for Benchmark: AQ0272

N 29° 53.550 W 081° 18.667 (NAD 83)

Altitude: 7.23

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

Location:
In ST JOHNS county, FL View Original Datasheet
Designation:
872 0576 TIDAL 10
Marker Type:
tidal station disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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Documented History (by the NGS)

01/01/1937 by CGS (MONUMENTED)
01/01/1972 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1972 AT ST AUGUSTINE. AT ST. AUGUSTINE, AT THE WEST END OF BRIDGE OF LIONS (STATE HIGHWAY A1A OVER MATANZAS BAY, IN THE TOP OF THE SOUTH COAMING OF WEST ABUTMENT OF BRIDGE, 31 FEET SOUTH OF CENTER LINE OF HIGHWAY, 10 FEET EAST OF EAST END OF BASE OF THE SOUTH ONE OF TWO STONE LION STATUES AND ABOUT 1 FOOT ABOVE LEVEL OF HIGHWAY.
01/01/1975 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1975 RECOVERED IN GOOD CONDITION.
01/01/1978 by FLDNR (GOOD)
RECOVERY NOTE BY FL DEPT OF NAT RES 1978 RECOVERED IN GOOD CONDITION.
01/01/1989 by USPSQD (MARK NOT FOUND)
RECOVERY NOTE BY US POWER SQUADRON 1989 (JD) MARK NOT FOUND.
03/24/1991 by NGS (MARK NOT FOUND)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1991 THE MARK APPEARS TO HAVE BEEN COVERED WITH CEMENT WHEN THE SIDEWALK WAS REPAIRED.
04/03/1991 by USPSQD (MARK NOT FOUND)
RECOVERY NOTE BY US POWER SQUADRON 1991 (JD) MARK NOT FOUND.

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. WARNING-Repeat measurements at this control monument indicate possible vertical movement.
  • This Tidal Bench Mark is designated as VM 5206 by the Center for Operational Oceanographic Products and Services.
  • 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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