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Details for Benchmark: MA0083

N 41° 44.550 W 078° 04.683 (NAD 83)

Altitude: 1590.04

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

Location:
In POTTER county, PA View Original Datasheet
Designation:
D 352
Marker Type:
bench mark disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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The catch basin has been replaced.

Found this mark. Speed limit sign is gone, but there was a stake with orage tape at the top of the catch basin making this an easy find.

Documented History (by the NGS)

01/01/1968 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1968 4.1 MI W FROM COUDERSPORT. 4.1 MILES WEST ALONG U.S. HIGHWAY 6 FROM THE COURT HOUSE IN COUDERSPORT, 5.0 MILES EAST OF THE POST OFFICE IN ROULETTE, SET IN THE TOP OF THE APPROXIMATE CENTER OF THE BACKWALL OF A CATCH BASIN, 22.5 FEET NORTHWEST CENTERLINE OF HIGHWAY, 8.0 FEET NORTHEAST OF A LARGE METAL SPEED LIMIT SIGN, AND IS ABOUT 1.0 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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