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Details for Benchmark: LY1556

N 41° 02.900 W 075° 58.317 (NAD 83)

Altitude: 1150.15

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

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

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Located by the description provided with prior logs assuring us it was still there. Disk was again covered by dirt and debris but is still in good condition.

[Photos:]
photoBM Disk "4 B, 1942" close-up.
photoBM "4 B, 1942" situated on stone culvert.

Previous note was very helpful. Still had to search a good bit before finding.

the existential outlaw

Found the culvert still in place and the disk in good condition, the stamping very legible.
There is not a telephone pole here now that I could see.
There has been a lot of construction in the area, probably new sewer lines, and it looks like this mark was used because there is a yellow line on the back wall of the culvert pointing right to the disk. When I got there, there was 2 inches of fresh dirt covering the disk, which was easily scraped away.
-Brub2

Documented History (by the NGS)

1/1/1942 by USGS (MONUMENTED)
1/1/1959 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1959 2.6 MI NE FROM ST JOHN. 1 MILE EAST ALONG A BLACK TOP ROAD FROM THE ST. JOHN LUTHERAN CHURCH AT ST. JOHN, THENCE 1.8 MILE NORTH EAST ALONG A BLACK TOP ROAD, SET IN THE TOP, AND 1 1/2 FEET NORTH EAST OF THE SOUTH WEST END, OF A ROCK BACK WALL FOR A CULVERT, 24 FEET NORTH EAST OF TELEPHONE POLE NO. 2619, 16 FEET NORTH WEST OF THE CENTERLINE OF THE BLACK TOP 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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