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Details for Benchmark: KV1351

N 40° 40.783 W 074° 43.317 (NAD 83)

Altitude: 154.93

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

Location:
In SOMERSET county, NJ View Original Datasheet
Designation:
R 25
Marker Type:
bench mark disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

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N 40° 40.815 W 074° 43.315

This is located in Tewksbury, Hunterdon County, not Somerset. This was actually an easy find. Go 375 feet north of the bridge, and look for a telephone pole about five feet above the road and west. Only one of those. Probe 1.9 feet south of the pole, and there it is, buried about an inch below ground level.
Hand-held GPS coordinates: N 40 40 48.9 W 074 43 18.9.

[Photos:]
photoKV1351 Tewksbury Hunterdon NJ Close Up
photoKV1351 Tewksbury Hunterdon NJ View North
photoKV1351 Tewksbury Hunterdon NJ View North
From side of Black River Road toward the only telephone pole five feet above the road.

Documented History (by the NGS)

01/01/1942 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1942 2.5 MI S FROM POTTERSVILLE. 2.5 MILES SOUTH ALONG A MACADAM ROAD FROM THE POTTERSVILLE REFORMED CHURCH AT POTTERSVILLE, SOMERSET COUNTY, 375 FEET NORTHWEST OF A CONCRETE BRIDGE, 1.9 FEET SOUTH OF POLE 70031-TY, IN LINE WITH THE TOW OF POLES, 30.8 FEET WEST OF THE CENTERLINE OF THE ROAD, NEAR A WHITE WOODEN WITNESS POST PAINTED USBM, AND ABOUT 5 FEET HIGHER THAN THE ROAD.
05/07/1994 by USPSQD (MARK NOT FOUND)
RECOVERY NOTE BY US POWER SQUADRON 1994 MARK NOT FOUND.

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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