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Details for Benchmark: LY1532

N 41° 06.417 W 075° 50.217 (NAD 83)

Altitude: 1234.15

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

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

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On a cement bridge structure along Route 437 just after the junction of Honey Hole Road and just west of White Haven.

[Photos:]
photoIMG_1616
photoIMG_1618

No problems with this one only a little bit of vine had to be cleared away. The "BM" on the bridge was kind of a give away.

[Photos:]
photoLY1532

Couldn't take a picture of this one. My camera batteries died.

Third of three while running errands in the area today.

Excellent description but the coords were not that close.

the existential outlaw

We drive over ths every day at least twice and didn't know it. This is our first one.

[Photos:]
photoGeocaching 030.jpg
N 41° 06.402 W 075° 50.236

This was a simple drive-up find, most welcome after our bushwhacking adventures at nearby triangulation station OLEY (http://www.geocaching.com/mark/details.asp?PID=LY1542). This benchmark disk was easy to spot from a distance due to its bright aqua color. It is secured as described in the northwest wingwall of the north abutment of the stone bridge which carries the blacktop road (now PA Route 437) across Little Nescopeck Creek. The disk is in good condition with all stamping legible.

[i]An official report on the condition of this mark has been submitted to NGS.[/i]

Zhanna

[Photos:]
photoLY1532, Luzerne County, PA
photoLooking down at the northwest wingwall and the mark ...
photoLooking south from the mark ...
photoLooking northwest along PA Route 437 ...
Rich examines the mark.
photoPainted on the west sidewall of the bridge are the numbers “2/50” ...
... but I could not determine the significance of this even after consulting the PennDOT Historic Bridge Survey database.
N 41° 06.406 W 075° 50.232

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

This second order vertical control station is located on the top surface of the northwest wingwall of a stone bridge across Little Nescopeck Creek, approximately 110 yards south along PA Rt. 437 from the intersection of County Road 41. The historical description leads reliably to the station. At the station a Garmin GPSmap76 receiver with remote active antenna was used to record WAAS-corrected coordinates which were 96 feet from the scaled coordinates listed on the NGS datasheet. The disk is well exposed, in excellent condition, and the stamped designation is clearly legible. ~Rich in NEPA~

[Photos:]
photoLY1532, “8 JNP 1235 1942,” Luzerne County, PA
photoGPSr and the station mark.
photoEyelevel view of station mark and surroundings.
photoOrientation view, facing southeast along PA Rt. 437.
photoOrientation view, facing northwest along PA Rt.437.

Documented History (by the NGS)

1/1/1942 by USGS (MONUMENTED)
1/1/1959 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1959 4.7 MI N FROM WHITE HAVEN. 4.7 MILE NORTH ALONG A BLACKTOP ROAD NO. 40040 FROM THE SCHOOL HOUSE AT WHITE HAVEN, SET IN TOP OF THE NORTHWEST WINGWALL FOR THE NORTH ABUTMENT OF A 25 FOOT STONE BRIDGE OVER A CREEK, 0.05 MILE SOUTH OF A BLACKTOP ROAD JUNCTION, 18 FEET WEST OF THE CENTERLINE OF THE BALCKTOP ROAD AND 1 FOOT BELOW THE 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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