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Details for Benchmark: MA0093

N 41° 46.517 W 078° 00.100 (NAD 83)

Altitude: 1703.83

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

Location:
In POTTER county, PA View Original Datasheet
Designation:
A 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 mark as described. This was my first 'underwater' BM as there was quite a bit of runoff flowing today. I had a tough time getting a decent pic, but I used a rag to make a temporary dam and did manage to get one.

Documented History (by the NGS)

01/01/1968 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1968 1 MI E FROM COUDERSPORT. 1.0 MILE EAST ALONG U.S. HIGHWAY 6 FROM THE COURT HOUSE IN COUDERSPORT, SET IN THE TOP OF THE EAST END OF BACKWALL OF A CATCH BASIN, 23 FEET NORTH OF THE CENTERLINE OF HIGHWAY, 14 FEET SOUTHEAST OF A GUYED LINE POLE, 0.5 FOOT WEST OF THE EAST END OF BACKWALL 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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