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Details for Benchmark: AA0158

N 24° 39.700 W 081° 30.867 (NAD 83)

Altitude: 1.97

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

Location:
In MONROE county, FL View Original Datasheet
Designation:
T 328
Marker Type:
bench mark disk
Setting:
retaining walls, concrete ledge, etc.
Stability:
May hold, but of type commonly subject to surface motion.

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Documented History (by the NGS)

1/1/1970 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1970 19.6 MI NE FROM KEY WEST. ABOUT 19.65 MILES NORTHEAST ALONG U.S. HIGHWAY 1 FROM THE CATHOLIC CHURCH AT KEY WEST, AT CUDJOE KEY, AT THE EAST END OF BOW CHANNEL VIADUCT, 67 FEET SOUTH OF THE CENTER LINE OF THE HIGHWAY, 57.7 FEET SOUTHWEST OF BENCH MARK M 70 RESET 1938=TIDAL BENCH MARK, 20 FEET WEST OF THE EAST END OF THE SOUTH WING WALL FOR VIADUCT, ABOUT 10 FEET BELOW THE LEVEL OF THE HIGHWAY AND SET IN TOP OF THE WING WALL. PIRATES COVE.
1/1/1978 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978 RECOVERED IN GOOD CONDITION.
1/1/1979 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979 RECOVERED IN GOOD CONDITION.
1/1/1982 by FLDNR (GOOD)
RECOVERY NOTE BY FL DEPT OF NAT RES 1982 RECOVERED IN GOOD CONDITION.
1/1/1984 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1984 RECOVERED IN GOOD CONDITION.
1/1/1985 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1985 RECOVERED IN GOOD CONDITION.
11/8/1988 by FLDNR (GOOD)
RECOVERY NOTE BY FL DEPT OF NAT RES 1988 RECOVERED IN GOOD CONDITION.
1/1/1989 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1989 (JHF) RECOVERED IN GOOD CONDITION.

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.
  • This Tidal Bench Mark is designated as VM 6962 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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