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Details for Benchmark: LY1179

N 41° 20.083 W 075° 17.217 (NAD 83)

Altitude: 1649.94

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

Location:
In PIKE county, PA View Original Datasheet
Designation:
M 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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I found it but it wasn't easy. Took two trips and a look at the log and pictures of someone who had previously found it. The condition was fine although there is a lot of moss on the boulder. The main issue is that the benchmark is 107 feet from where my gps said it should be. I notice that two prior finders reported it to be at a different place also. Not sure how to account for this. It was actually on the other side of the road from where my gps took me. The location I recorded is 41 20.098 N 075 17.232 W.

Our recovery of tri-station PINE was followed by the search for this mark, which is located just across Beaver Dam Road from the trail we took to approach PINE. We spotted the right boulder from the road and walked directly to the mark, which was exposed and in good condition. The description is accurate except that Beaver Dam Road is T 389 rather than T 380.

[I]A report on the condition of this station has been submitted to NGS, along with the following recovery note:[/I]

Station mark recovered in good condition. The mark is located on Delaware State Forest land, directly across Beaver Dam Road (T 389) from a gated woods road and trailhead (Beaver Dam Trail, marker 120). It is set in a boulder as described, approximately 34 feet west of the centerline of Beaver Dam Road.

Autonomous (non-corrected) handheld GPS coordinates for the station are 41 20 5.76(N) 075 17 13.98(W).

Zhanna

[Photos:]
photoLY1179, Pike County, PA
photoEyelevel view of the mark on the boulder.
photoLooking E toward Beaver Dam Road and trailhead.
N 41° 20.096 W 075° 17.233

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

This second order vertical control station was found as described. The historical directions are still usable, except that the road is T-389 (not T-380) and is named Beaver Dam Road. The station is directly across from a gated woods road and a trailhead (Beaver Dam Trail, marker #120) on Delaware State Forest land. At the station a Garmin GPSmap76 receiver with remote active antenna was used to record autonomous (non-corrected) coordinates which were roughly 107.6 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:]
photoLY1179, “M 234 1959,” Pike County, PA.
photoGPSr and the station mark.
photoEyelevel view of station mark and setting.
photoOrientation view, facing east, Beaver Dam Road.

Documented History (by the NGS)

1/1/1959 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1959 1.7 MI NE FROM GREENTOWN. 1.20 MILE EAST ALONG COUNTY ROAD 51027 FROM THE POST OFFICE IN GREENTOWN THENCE 0.05 MILE TO T JUNCTION THENCE NORTH ON T 380 FOR 0.45 MILE, SET IN TOP CENTER OF A 4 FOOT BY 4 FOOT BOULDER PROJECTING 1 FOOT, 141 FEET NORTH OF STATE FOREST BOUNDRY LINE, 34 FEET WEST OF THE CENTERLINE OF 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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