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Details for Benchmark: LY1116

N 41° 10.767 W 075° 25.067 (NAD 83)

Altitude: 1933.55

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

Location:
In MONROE county, PA View Original Datasheet
Designation:
DLW
Marker Type:
survey disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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Found, as described and in good condition (markings somewhat obscured) while visiting the steam train at Tobyhanna station during the January 2011 ice harvest on Millpond #1.

[Photos:]
photoLY1116 DLW mark 1
Mark from about 1m away
photoLY1116 DLW mark 2
Closeup of mark
photoLY1116 DLW view NW
View to the NW; mark is al lower right and steam train from Steamtown National Park is in background
photoLY1116 DLW view SE
View to the SE; Mark is at lower left, hard to see but in line with edge of concrete pad to the left of the tower structure on the right.
photoLY1116 DLW view NE
View to the NE; mark is at lower left. Old Canadian National steam locomotive is in background, having moved from my earlier photo (view to NW).

Rode the Steamtrain from Steamtown N.H.S. Walked up to this one while the engine was switching around.

Thanks to pictures of Zhanna and Rich, walked right up to this one. Thanks guys.

N 41° 10.770 W 075° 25.070

On our way to pick up a moving geocache in the nearby Tobyhanna State Park, Rich and I drove past the railroad station and control tower and he mentioned that he thought a benchmark was located nearby. Although it was a horribly cold and windy day and we could barely stand to be outside, on our way back home we did stop to search for the mark. We found it beneath some gravel at the base of the control tower as described, just east of Route 423. The stamping is eroded and very difficult to make out, but the mark doesn't appear to have been disturbed.

[i]A report on the condition of this mark was submitted to NGS, along with the following recovery note:[/i]

The stamping is worn and difficult to discern. The mark appears to be in good condition otherwise.

Zhanna

[Photos:]
photoLY1116, Monroe County, PA
photoEye-level view of the mark, with the north wall of the control tower in the background.
photoView of the control tower, looking east, with the general location of the mark indicated.
N 41° 10.771 W 075° 25.074

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

This second order vertical control station is set in the northeast corner of a concrete slab flush with the ground and adjacent to an abandoned two-story concrete railroad control tower. The 1956 historical description leads reliably to the station. The mark was covered with dirt and gravel. At the station a Garmin GPSmap76 receiver with remote active antenna was used to record autonomous (non-corrected) coordinates which were 40.2 feet from the scaled coordinates listed on the NGS datasheet. The station mark is in fair condition, and the stamped designation is barely legible. ~Rich in NEPA~

[Photos:]
photoLY1116, “DLW,” Monroe County, PA.
photoGPSr and the station mark.
photoEyelevel view of station mark and setting.
photoOrientation view, facing north and RR crossing.
photoView facing east and the railroad control tower.

Documented History (by the NGS)

1/1/1932 by USGS (MONUMENTED)
1/1/1956 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1956 AT TOBYHANNA. AT TOBYHANNA, ALONG THE DELAWARE, LACKAWANNA AND WESTERN RAILROAD, ON TOP OF THE NORTHWEST CORNER OF A CONCRETE PLATFORM AROUND A CONTROL TOWER, 41.3 FEET EAST OF THE CENTER LINE OF THE FIRST STREET CROSSING EAST OF THE STATION, 8.2 FEET NORTHEAST OF THE NORTHWEST CORNER OF A TWO-STORY CONCRETE CONTROL TOWER, 2.4 FEET SOUTH OF THE SOUTH RAIL AND 1-FOOT BELOW THE LEVEL OF THE TRACK.
1/1/1961 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1961 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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