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Details for Benchmark: KW1138

N 40° 16.500 W 076° 51.283 (NAD 83)

Altitude: 468.63

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

Location:
In DAUPHIN county, PA View Original Datasheet
Designation:
T 155
Marker Type:
bench mark disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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Logged during a benchmark run through the city today. It was covered completely, but fortunately descriptions from previous finders helped me locate it quickly.

[Photos:]
photoKW1138 - looking W after I dug it out - 11/16/14
photoKW1138 - closer shot - 11/16/2014

Found as described. It was covered with grass and mud, but previous photos made it easy to find.

[Photos:]
photobenchmark

In pretty good shape.

[Photos:]
photoKW1138

tftc

Grabbed this benchmark with my parents since they were in town - Their first. Benchmark was slightly covered with dirt and grass.

[Photos:]
photoKW1138

This was covered up with dirt and grass but we uncovered it. It should be visible for a while now.

[Photos:]
photoclose up view
photoview of benchmark area

Recovered in good condition - US 22 now runs to the north - disk is on the SW corner of 23rd & Walnut Streets..

[Photos:]
photoT 155 (KW1138) disk - Harrisburg, PA
photoT 155 (KW1138) area - view looking W

This one was under snow the first time I looked but was an easy find today.

N 40° 16.492 W 076° 51.297

This was a fairly easy find and the GPS was reading fairly close.

[last edit: 7/4/2002 10:48:50 AM PST]

[Photos:]
photoT 155
photoT 155 and GPS
photoT 155 Location

Documented History (by the NGS)

01/01/1942 by CGS (MONUMENTED)
01/01/1960 by CGS (GOOD)
DESCRIBED BY COAST AND GEODETIC SURVEY 1960 AT HARRISBURG. AT HARRISBURG, 1.5 MILES NORTHEAST ALONG U.S. HIGHWAY 22 FROM THE SOUTHWEST END OF THE LARGE BRIDGE OVER THE RAILROAD TRACKS, SET IN THE CENTER OF THE SOUTHWEST HEADWALL OF A LARGE DRAINAGE CULVERT AT THE INTERSECTION OF NO. 22, 23RD AND HOFFMAN STREETS, 36.6 FEET SOUTHEAST OF THE CENTERLINE OF THE HIGHWAY, 44 FEET NORTHEAST OF THE NORTH CORNER OF A RED BRICK HOUSE (NO. 2219), 26 FEET SOUTHWEST OF 23RD STREET. A STANDARD DISK.

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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