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Details for Benchmark: AA0289

N 24° 42.250 W 081° 09.333 (NAD 83)

Altitude: 26.26

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

Location:
In MONROE county, FL View Original Datasheet
Designation:
V 278
Marker Type:
bench mark disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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Found while running the bridge. Great condition.

Saw this on a previous bike ride on bridge. This time I took the time to find PID and log it.

With my mom and dad (AstroD-Team) finding marks in the Keys!

[Photos:]
photoV278

Found as described and recovered in good condition.

Our yearly 2.1 mile pilgrimage to Pigeon Key. This time we came in search of benchmarks.

[Photos:]
photoclose up AA0289 - Monroe County, FL

Unable to find the cache; however, we discovered this benchmark.

Out and about looking for the 2 Mile Challenge by Silly Gilley. Came across this benchmark.

found as described on visit to pigeon key

Documented History (by the NGS)

01/01/1966 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1966 4.8 MI SW FROM MARATHON. ABOUT 4.85 MILES SOUTHWEST ALONG U.S. HIGHWAY 1 FROM THE POST OFFICE AT MARATHON, 1.95 MILES WEST OF THE EAST END OF THE SEVEN MILE BRIDGE, SET ON THE TOP OF THE NORTH CONCRETE CURB OF THE SEVEN MILE BRIDGE, NEAR THE JUNCTION OF A ROAD LEADING TO PIGEON KEY, 10 FEET NORTH OF THE CENTER LINE OF THE HIGHWAY AND 1/2 FOOT ABOVE THE LEVEL OF THE HIGHWAY.
01/01/1978 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978 RECOVERED IN GOOD CONDITION.
01/01/1982 by FLDNR (GOOD)
RECOVERY NOTE BY FL DEPT OF NAT RES 1982 RECOVERED IN GOOD CONDITION.
01/01/1982 by LOCSUR (GOOD)
RECOVERY NOTE BY LOCAL SURVEYOR (INDIVIDUAL OR FIRM) 1982 ABOUT 4.85 MILES SOUTHWEST ALONG U.S HWY 1 FROM POST OFFICE AT MARATHON, 1.95 MILE SOUTHWEST OF THE EAST OF OLD SEVEN MILE BRIDGE, SET ON THE TOP OF THE NORTH CONCRETE CURB, 10 FEET NORTH OF THE CENTERLINE OF HIGHWAY, 1/2 FOOT ABOVE LEVEL OF HIGHWAY.

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 6314 by the Center for Operational Oceanographic Products and Services.
  • This Tidal Bench Mark is designated as VM 6318 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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