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Details for Benchmark: AA0140

N 24° 39.233 W 081° 32.533 (NAD 83)

Altitude: 10.5

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

Location:
In MONROE county, FL View Original Datasheet
Designation:
C 272
Marker Type:
bench mark disk
Setting:
pavements (street, sidewalk, curb, apron, etc.)
Stability:
Mark of questionable or unknown stability.

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Documented History (by the NGS)

1/1/1966 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1966 17.8 MI NE FROM KEY WEST. 17.85 MILES NORTHEAST ALONG U.S. HIGHWAY 1 FROM THE CATHOLIC CHURCH AT KEY WEST, SET ON THE TOP OF THE WEST END OF THE NORTH CONCRETE CURB OF THE PARK CHANNEL VIADUCT, ON PARK KEY, 12 FEET NORTH OF THE CENTER LINE OF THE HIGHWAY AND 1.5 FEET ABOVE THE LEVEL OF THE BRIDGE FLOOR. FOR TIDAL STATION 79, FLORIDA.
1/1/1978 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978 RECOVERED IN GOOD CONDITION.
1/1/1982 by FLDNR (GOOD)
RECOVERY NOTE BY FL DEPT OF NAT RES 1982 RECOVERED IN GOOD CONDITION. THE DESCRIPTION IS ADEQUATE EXCEPT THAT THE EDGE OF THE DISK HAS BEEN SHEARED OFF BUT THE MARK IS STABLE. USE WITH CAUTION.
1/1/1982 by LOCSUR (GOOD)
RECOVERY NOTE BY LOCAL SURVEYOR (INDIVIDUAL OR FIRM) 1982 RECOVERED IN GOOD CONDITION.
1/1/1984 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1984 THE MARK IS ON THE OLD BRIDGE BR 8 A 1943 WHICH REMAINS FOR PEDESTRIAN USE AND NOT THE NEW BRIDGE 900112 WHICH IS IMMEDIATELY TO THE NORTH OF THE OLD BRIDGE.
1/1/1984 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1984 ABOUT 1/4 OF MARK CUT OFF BUT STILL A GOOD MARK.
1/1/1988 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1988 (JHF) RECOVERED IN GOOD CONDITION.
11/8/1988 by FLDNR (SEE DESCRIPTION)
RECOVERY NOTE BY FL DEPT OF NAT RES 1988 RECOVERED IN FAIR CONDITION AND AS DESCRIBED EXCEPT THAT A NEW BRIDGE HAS BEEN BUILT NORTH OF OLD U.S. HIGHWAY 1 AND THE EDGE OF THE MARK HAS BEEN SHEARED OFF.

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.
  • 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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