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Details for Benchmark: LY0566

N 41° 19.600 W 074° 47.817 (NAD 83)

Altitude: 508.61

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

Location:
In PIKE county, PA View Original Datasheet
Designation:
509 PADH
Marker Type:
survey disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

Must Read!

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I've never seen this type before.

[Photos:]
photoThe disk on the bridge wall
photoHiding behind the sign

Have driven by this one numerous times

Found as described.

Found it.®

N 41° 19.622 W 074° 45.833

Found it on the second try. Only 116 feet off. Another PADH disk with no inscription. This one is on Broad, near Sarah, though the coordinates were closer for the other disk I found. Oh, well.

[Photos:]
photoLY0566 Milford Pike Pa Close Up
photoLY0566 Milford Pike Pa View Northeast
photoLY0566 with GPS and Coordinates

Dolphin is nothing, if not obstinant! He saw where Sarah interesected Rte 209. Looked 31 yards northeast. He didn't see a bridge. The coordinates put this mark on Rte 209 (west side)! So, he wandered down the hill from the PennDot parking area. He found a lovely bridge (culvert?) about 31 yards northeast of Sarah! But about thirty feet below Rte 209. AND, he found a PADH disk on the southeast end of the headwall! When he returned home to log it, he found that he had found the wrong disk. AND, that this one does not have a PID. Oh, well. Maybe on the next visit. But, it's right where it should be! 31 yards northeast of Sarah! Oh, well. But, it's a nice disk!

[Photos:]
photoNot LY0566
But it's in the right place, if thirty feet below the highway.
photoNot where LY0566 is
But it's a lovely bridge (?) at the right location (?) Oh, well. But it is thirty feet below grade.
N 41° 19.622 W 074° 47.834

It was a little tricky to find the concrete bridge. At first we stayed on Route 209, missing the point at which that route and Broad Street diverge. After realizing we'd gone too far beyond the correct area, we turned around and I spotted the bridge through the trees. The marker itself was an easy find, thanks to the description and photos given by patw.

Zhanna and Aaron

[Photos:]
photoLY0566, Pike County, PA
photoThe marker located just behind the sign...
... and plenty of leftover snow on a gray and windy day.

Found in good condition. See photos. . . . patrick & shirley

[Photos:]
photoLY0566 disc
photoDisc is mounted in right wall of bridge.
Disc is immediately behind the yellow and black sign in the right foreground of photo.
photoPlaque in bridge wall from 1865!

#6 Public area, parking nearby. Near shops, restaurants and the courthouse. Easy find!

Documented History (by the NGS)

Unknown by PADH (MONUMENTED)
01/01/1956 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1956 AT MILFORD. AT MILFORD, 0.3 MILE NORTHEAST OF THE COUNTY COURTHOUSE, AT THE BROAD STREET BRIDGE OVER VANDEMARK CREEK, 31 YARDS NORTHEAST OF THE INTERSECTION OF BROAD AND SARAH STREET, ON TOP AND AT THE SOUTHWEST END ON THE SOUTHEAST CONCRETE HEAD WALL OF THE BRIDGE, 12 FEET SOUTHEAST OF THE CENTER LINE OF BROAD STREET, 0.8 FOOT NORTHEAST OF THE SOUTHWEST END OF THE HEAD WALL AND 3 FEET ABOVE THE LEVEL OF THE STREET.
01/01/1978 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978 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. WARNING-Repeat measurements at this control monument indicate possible vertical movement.
  • 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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