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Details for Benchmark: LY1185

N 41° 20.933 W 075° 18.433 (NAD 83)

Altitude: 1570.7

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

Location:
In PIKE county, PA View Original Datasheet
Designation:
G 234
Marker Type:
bench mark disk
Setting:
in a boulder
Stability:
May hold, but of type commonly subject to surface motion.

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The pictures taken by Rich in NEPA last July 2004 were extremely helpful in finding this mark.

N 41° 20.938 W 075° 18.429

[B]Recovered in good condition.[/B]

This second order vertical control station is set in the top of a large flat exposed boulder. The historical description was sufficiently helpful in finding the station but some of the reference items have changed. The station is 43 feet east of PP&LCo powerpole number 67057-N44025-13664, 110½ feet north-northeast of BTCo utility pole A-7-1, and 42 feet south-southwest from the center of the “PP&L Ledgedale Recreation & Camping Area” sign. At the station a Garmin GPSmap76 receiver with remote active antenna was used to record WAAS-corrected coordinates which were 35.5 feet from the scaled coordinates listed in the NGS datasheet. The mark is well exposed, in good condition, and the stamped designation is legible.

~Rich in NEPA~

[Photos:]
photoLY1185, "G 234 1959," Pike County, PA.
photoGPSr and the station mark.
photoEyelevel view of station mark and setting.
photoOrientation view, facing NNE and PP&L sign.
photoPowerpole ID numbers.
photoPowerpole ID number.
photoUtility pole ID numbers.

Documented History (by the NGS)

1/1/1959 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1959 3.6 MI NE FROM NEW FOUNDLAND. 3.6 MILE NORTH EAST ALONG STATE 507 FROM THE FIRST NATIONAL BANK AT THE INTERSECTIONS OF ROUTES 90, 507 AND 290 IN NEW FOUNDLAND TO THE JUNCTION OF T 380, SET IN TOP OF A 5 FOOT BY FOUR FOOT BY FOUR FOOT (TRIANGLE) BOULDER PROJECTING 1 FOOT, 75 FEET EAST OF THE CENTERLINE OF ROUTE T 380, 86 FEET SOUTH EAST OF THE CENTERLINE OF THE INTERSECTION, 66 FEET SOUTH EAST OF POLE NO. HL-15-17, 61 FEET EAST-NORTH EAST OF TELEPHONE POLE NO. A7, 84 FEET SOUTH OF THE CENTERLINE OF STATE 507.

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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