Details for Benchmark: LY1228
N 41° 23.500 W 075° 08.017 (NAD 83)
Coordinates may not be exact. Altitude is ADJUSTED and location is SCALED. (more info)
- In PIKE county, PA View Original Datasheet
- L 235
- Marker Type:
- bench mark disk
- in a boulder
- May hold, but of type commonly subject to surface motion.
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||Zhanna posted a note for LY1228
I concur with all of Rich's observations. This is in fact the second time I've searched this area; this time I felt more confident that we'd find the mark since we had more time and resources to devote to the task. I'd like to search at least one more time before giving up on this benchmark.
||Rich in NEPA posted a note for LY1228
This vertical control station is described as being located on the top surface of a large outcropping boulder along the east side of Rt. 402. The historical description leads to what is now a large open parking area at the south end of Lake Shore Drive. A number of likely boulders were inspected within the wooded area just south of this space, but no mark was found. Measurements taken from the centerlines of Rt. 402 and Lake Shore Drive seem to indicate the boulder could have been within the bounds of this clearing, and may have been removed or pushed off to the edge when the parking area was created. This is pure speculation, and I intend to return and attempt a better search in the near future. ~Rich in NEPA~
Documented History (by the NGS)
|01/01/1959 by CGS (MONUMENTED)
|DESCRIBED BY COAST AND GEODETIC SURVEY 1959
7.1 MI SE FROM HAWLEY. 4.4 MILE SOUTHEAST ALONG U.S. HIGHWAY NO 6 FROM HAWLEY TO THE JUNCTION OF STATE HIGHWAY 402, THENCE 2.7 MILE SOUTH ALONG STATE HIGHWAY 402, SET IN TOP AND 2 FEET NORTH OF THE SOUTH END OF A 7 FOOT BY 4 FOOT BY 2 FOOT BOULDER, 72 FEET SOUTH OF THE CENTERLINE OF A GRAVEL ROAD EAST WITH A SIGN LAKE SHORE DRIVE R 402-2, 57 FEET EAST AND 1 FOOT BELOW THE CENTER LINE OF STATE HIGHWAY 402.
- 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.