Skip to Content

Details for Benchmark: LY1180

N 41° 20.500 W 075° 17.883 (NAD 83)

Altitude: 1553.84

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

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

Must Read!

Benchmarks may be on private property or in dangerous locations. Obey local laws. By using the services on Geocaching.com you agree to this disclaimer.

I parked the motorcycle on the road and started looking for the mark when the owner of the property, Mr. Wayne Croft, approached me. He lives on the adjacent lot. Mr. Croft was very nice and showed me where the benchmark was. I think I would have found it on my own, thanks to the good notes and pictures left almost a year ago by Rich and Zhanna. The mark was approximately 100 feet from where my gps would have taken me.

N 41° 20.509 W 075° 17.892

We had achieved our main goal for the day—a successful recovery of nearby triangulation station PINE—and we stopped for a few simple benchmarks on our way back to the Interstate. This mark was a relatively easy find, though we stood on top of it for a minute before we noticed it was at our feet. While we photographed the mark and checked the reference objects, a man who'd been using a Bobcat nearby to clear brush approached Rich to ask what we were doing on his land. He was friendly and gave us no trouble, and seemed at least mildly interested in our explanation of benchmarks. He was surprised that he had never noticed the mark, having owned the land for years. Eventually the man went about his business and we finished up our measurements. We measured a slightly different distance from the centerline of Beaver Dam Road (noted in the official recovery) and took a measurement from the nearest pole (BT Co. 19/A-7/A-8) because the one mentioned in the 1959 description no longer exists (the landowner confirmed that the poles were replaced several years ago). We did not locate the trees that were originally used as reference objects. The disk is in good condition with legible stamping, and was found set in the boulder as described in the 1959 recovery note.

Those who seek this mark in the future should be aware that the mark is located on private—though non-posted—property owned by Mr. Wayne Croft, who lives in the house on the adjacent lot.

[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 near the T-intersection of Beaver Dam Road (T 389) and Bartleson Road (T 355). It is set in a boulder as described, approximately 72.3 feet (22 meters) west-southwest of the centerline of Beaver Dam Road and 71 feet (21.7 meters) west-northwest of telephone pole BT Co 19/A-7/A-8.

Autonomous (non-corrected) handheld GPS coordinates for the station are 41 20 30.30(N) 075 17 53.46(W).

Zhanna

[Photos:]
photoLY1180, Pike County, PA
photoEyelevel view of the mark on the boulder.
photoFacing ESE, toward T-intersection.
N 41° 20.505 W 075° 17.891

[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-350) and named Beaver Dam Road, which intersects with Bartleson Road (T-355). The station is roughly 72.3 feet (22 meters) west-southwest of the centerline of the road, and 71 feet (21.7 meters) west-northwest of powerpole BTCo. #19/A-7/A-8. At the station a Garmin GPSmap76 receiver with remote active antenna was used to record autonomous (non-corrected) coordinates which were roughly 47.5 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:]
photoLY1180, “H 234 1959,” Pike County, PA.
photoGPSr and the station mark.
photoEyelevel view of station mark and setting.
photoOrientation view, facing east and T-intersection.
photoPower pole ID numbers.

Documented History (by the NGS)

01/01/1959 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1959 2.5 MI NE FROM GREENTOWN. 1.20 MILE EAST ALONG COUNTY ROAD 51027 FROM THE POST OFFICE IN GREENTOWN THENCE 0.05 MILE TO T INTERSECTION THENCE 1.25 MILE NORTH ON T 350, SET IN TOP CENTER OF A 5 FOOT BY 3 FOOT BOULDER PROJECTING 3 INCHES, 134 FEET WEST-SOUTH WEST OF A 27 INCH RED MAPLE TREE, 47 FEET NORTH-NORTH EAST OF A 22 INCH RED MAPLE TREE, 33 FEET WEST OF A 24 INCH RED MAPLE TREE, 81 FEET WEST-NORTH WEST OF TELEPHONE POLE NO. A-28, 67 FEET WEST-SOUTH WEST OF THE CENTERLINE OF THE ROAD, 98 FEET WEST OF CENTERLINE OF T INTERSECTION, ABOUT 6 INCHES ABOVE THE GROUND.

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.

Advertising with Us

Return to the Top of the Page