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Details for Benchmark: AC8512

N 27° 47.567 W 097° 23.317 (NAD 83)

Altitude: 5.36

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

Location:
In NUECES county, TX View Original Datasheet
Designation:
90002 F=877 5351 F TIDAL
Marker Type:
bench mark disk
Setting:
stainless steel rod
Stability:
Probably hold position/elevation well.

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N 27° 47.500 W 097° 23.332

I got lost because of the bogus coordinates added earlier. I am including coordinates that will lead you to the benchmark, or at least pretty close.

[Photos:]
photoAC8512

Found

[Photos:]
photoProof

Out for a day of caching with WildGooseChase. Took a bit of measuring off the curb lines to narrow down the position, then we had to dig out 2 inches of mud.

[Photos:]
photoBlucher Institute for Surveying Disk, 90002F
N 27° 47.664 W 097° 23.478

think i missed this the first time because a family was sitting on it! second time lucky with a little help from a friend.

located as described

Documented History (by the NGS)

Unknown by CBI (MONUMENTED)
02/09/1997 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1997 (GAS) 0.3 KM (0.20 MI) EASTERLY ALONG THE LAWRENCE STREET T-HEAD ENTRANCE ROAD FROM THE INTERSECTION OF SHORELINE BOULEVARD IN CORPUS CHRISTI, THENCE 0.1 KM (0.05 MI) SOUTHERLY ALONG THE T-HEAD, 33.5 M (109.9 FT) EAST OF THE CENTERLINE OF THE SOUTHBOUND LANES OF THE T-HEAD, 33.1 M (108.6 FT) WEST OF THE CENTER OF THE NORTHBOUND LANES OF THE T-HEAD, 27.0 M (88.6 FT) WEST OF THE EAST END OF THE 2ND MEDIAN NORTH OF THE SOUTH END OF THE T-HEAD, 26.2 M (86.0 FT) SOUTH OF UTILITY LIGHT POLE NUMBER 21 A, 2.5 M (8.2 FT) SOUTH OF THE NORTH EDGE OF THE MEDIAN, 0.6 M (2.0 FT) NORTH OF THE SOUTH EDGE OF THE MEDIAN, AND 0.3 M (1.0 FT) ABOVE THE LEVEL OF THE T-HEAD. NOTE--THE DISK IS ENCASED IN A 6-INCH PVC PIPE AND IS FLUSH WITH THE GROUND SURFACE.

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 December 1997.
  • This Tidal Bench Mark is designated as VM 15609 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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