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Details for Benchmark: KW2777

N 40° 25.617 W 077° 00.517 (NAD 83)

Altitude: 360.14

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

Location:
In DAUPHIN county, PA View Original Datasheet
Designation:
A 411
Marker Type:
metal rod
Setting:
stainless steel rod in sleve
Stability:
Most reliable and expected to hold position/elevation well.

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Recovered in good condition with the help of a metal detector...

[Photos:]
photoA 411 (KW2777) metal rod - Dauphin County,PA
note - topo map puts this one in Perry County, but NGS datasheet lists in Dauphin County
photoA 411 (KW2777) access cover - Dauphin County,PA
photoA 411 (KW2777) area - view looking NW

Located just as Airnut described. The cover was under a bit of grass and dirt.

[Photos:]
photoKW2777 C 411 Perry County, PA
photoKW2777 C 411 Perry County, PA Access Cover
photoKW2777 A 411 Perry County, PA Location
N 40° 25.635 W 077° 00.556

This is my first metal rod. I noticed a depression in the grass. The sleeve was filled with water. The sign was in poor condition.

[Photos:]
photoA 411 Access Cover Dauphin County, PA
photoA 411 Cover Open
photoA 411 Area

Documented History (by the NGS)

01/01/1983 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1983 IN AMITY HALL. IN AMITY HALL, AT THE ENTRANCE OF AMITY FARM, 0.08 KM (0.05 MI) WEST OF THE ENTRANCE RAMPS OF U.S. HIGHWAY 11, 15 NORTH AND SOUTH, 16.45 METERS (54.0 FT) NORTH OF THE CENTERLINE OF THE ROAD RUNNING EAST AND WEST THROUGH AMITY HALL, 14.63 METERS (48.5 FT) SOUTHEAST OF TELEPHONE POLE 473 WITH 2 GUY WIRES, 11.27 METERS (37.0 FT) WEST OF THE CENTER OF THE PAVED ENTRANCE ROAD OF AMITY FARM, 0.76 METER (2.5 FT) NORTHEAST OF THE NORTHEAST CORNER OF THE STONE PLANTER WITH SIGN (AMITY FARM). THE MARK IS ABOVE LEVEL WITH ROAD.

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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