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Details for Benchmark: LZ1475

N 41° 46.367 W 077° 59.033 (NAD 83)

Altitude: 1710.02

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

Location:
In POTTER county, PA View Original Datasheet
Designation:
1710
Marker Type:
survey disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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The wingwall has been replaced. A PENNDOT disk 1711.17 was set in 2006 in the new wingwall.

Found as decribed

Found mark as described.

Found with no problem.

[Photos:]
photoRoutes 6 and 872
photoRoutes 6 and 872

Documented History (by the NGS)

Unknown by PADH (MONUMENTED)
01/01/1968 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1968 2 MI E FROM COUDERSPORT. 2.0 MILES EAST ALONG U.S. HIGHWAY 6 FROM THE COURT HOUSE IN COUDERSPORT, 2.1 MILES WEST OF SWEDEN VALLEY, 0.05 MILE EAST OF STATE HIGHWAY 872, SET IN THE TOP OF THE SOUTHWEST WINGWALL OF A BRIDGE, 19 FEET SOUTH OF THE CENTERLINE OF HIGHWAY, AND IS ABOUT 1 FOOT BELOW THE LEVEL OF THE HIGHWAY.

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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