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Details for Benchmark: AA0432

N 24° 57.467 W 080° 34.317 (NAD 83)

Altitude: 6.63

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

Location:
In MONROE county, FL View Original Datasheet
Designation:
K 276
Marker Type:
bench mark disk
Setting:
footings/foundation walls of small/medium structures
Stability:
May hold, but of type commonly subject to surface motion.

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Documented History (by the NGS)

01/01/1966 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1966 3.4 MI NE FROM ISLAMORADA. 3.4 MILES NORTHEAST ALONG U.S. HIGHWAY 1 FROM THE POST OFFICE AT ISLAMORADA, ALSO 5.3 MILES SOUTHWEST ALONG U.S. HIGHWAY 1 FROM THE POST OFFICE AT TAVERNIER, ABOUT 1.0 MILE NORTHEAST OF A 200-FOOT CONCRETE BRIDGE OVER SNAKE CREEK, 300 FEET SOUTHEAST OF THE CENTER LINE OF HIGHWAY, ON THE GROUNDS OF A LARGE MUSEUM, SET IN THE TOP OF THE NORTH CORNER OF CONCRETE BASE WHICH SUPPORTS A LARGE ANCHOR, 24.0 FEET NORTH OF THE WEST CORNER OF THE BUILDING AND ABOUT LEVEL WITH THE HIGHWAY.
01/01/1979 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979 RECOVERED IN GOOD CONDITION.
01/01/1983 by USPSQD (MARK NOT FOUND)
RECOVERY NOTE BY US POWER SQUADRON 1983 SEARCHED FOR ANCHOR IS GONE AND STONE BASE MUSEUM KNOWN AS "THEATRE OF THE SEA"
01/01/1987 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1987 (TD) RECOVERED IN GOOD CONDITION.
01/01/1988 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1988 (TD) RECOVERED IN GOOD CONDITION.
11/14/1990 by FLDNR (GOOD)
RECOVERY NOTE BY FL DEPT OF NAT RES 1990 RECOVERED IN GOOD CONDITION, ADD MUSEUM IS NOW CLOSED AND BUILDING IS FOR SALE.

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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