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Details for Benchmark: LX0525

N 41° 55.750 W 072° 37.567 (NAD 83)

Altitude: 36.63

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

Location:
In HARTFORD county, CT View Original Datasheet
Designation:
M 8
Marker Type:
survey disk
Setting:
abutments and piers of large bridges
Stability:
Most reliable and expected to hold position/elevation well.

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This was an easy find. We drive over this bridge all the time.

[Photos:]
photobenchmark disk on bridge
disk stamped RESET 1991
photoSide view of benchmark setting
The spray paint helped us find the disk

The mark is labeled as M-8 Reset 1991. It appears to be in the same position as the M-8 as hole looks like it was chishled around the mark.

[Photos:]
photoLX0525 M-8 with GPS
photoLX0525 M-8 close
photoLX0525 M-8 setting

Technically a DNF because this was RESET in 1991 with bridge reconstruction and so marked.

[Photos:]
photoLX0525 Reset.jpg

Documented History (by the NGS)

01/01/1923 by CGS (MONUMENTED)
01/01/1967 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1967 AT WINDSOR LOCKS. AT WINDSOR LOCKS, HARTFORD COUNTY, AT THE HIGHWAY BRIDGE OVER CONNECTICUT RIVER, AT THE SOUTH END OF THE WEST ABUTMENT, AND IN THE TOP OF THE PARAPET WALL. A STANDARD DISK, STAMPED 37.401 M 8 1923.
01/01/1978 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978 RECOVERED IN GOOD CONDITION.
01/01/1986 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1986 RECOVERED IN GOOD CONDITION.
01/01/1989 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1989 (REM) 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.
  • 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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