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Details for Benchmark: KV1424

N 40° 56.883 W 075° 06.867 (NAD 83)

Altitude: 315.03

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

Location:
In NORTHAMPTON county, PA View Original Datasheet
Designation:
E 11
Marker Type:
bench mark disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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This was just a short hike down the tracks, and an easy find. This one is in good shape.

[Photos:]
photoKV1424

Found it.®

N 40° 56.902 W 075° 06.848

The gentleman at the Slateford Inn pointed out to us that there was this benchmark a short distance north.
Found easily.

[Photos:]
photoKV1424 Upper Mount Bethel Northampton PA Close Up
photoKV1424 Upper Mount Bethel Northampton PA View W
N 40° 56.898 W 075° 06.850

The north end of Slateford Road ends in a big curve that joins with 611. That curve is a large embankment that once was an overpass over the tracks below. The overpass was filled in, but the road is supported on the northeast by the old overpass pier. If you follow the tracks from the Slateford Inn, you will find the benchmark set vertically in the pier wall that supports Slateford road above.

[Photos:]
photoE 11 (KV1424) Portland, PA
photoKV1424 Setting, Portland, PA

Found on side of concrete wall.

[Photos:]
photoDISK
photoFULL VIEW OF DISK ON CONCRETE WALL

Documented History (by the NGS)

01/01/1932 by CGS (MONUMENTED)
01/01/1956 by CGS (GOOD)
DESCRIBED BY COAST AND GEODETIC SURVEY 1956 2 MI N FROM PORTLAND. 2.0 MILES NORTH ALONG THE DELAWARE, LACKAWANNA AND WESTERN RAILROAD FROM THE STATION AT PORTLAND, AT SLATEFORD JUNCTION, SET VERTICALLY IN THE EAST FACE OF A CONCRETE PIER SUPPORTING AN OVERPASS, 28 FEET WEST OF THE WEST RAIL OF THE EAST TRACK AND 4 FEET ABOVE THE LEVEL OF THE TRACK.
09/25/1994 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1994 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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