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Details for Benchmark: MA1131

N 41° 28.883 W 079° 25.583 (NAD 83)

Altitude: 1076.53

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

Location:
In FOREST county, PA View Original Datasheet
Designation:
3 70+90
Marker Type:
survey disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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The former State Highway 66 has been closed at this location. The north head wall of the culvert was located, but the south head wall and wing walls were submerged beneath the waters of Tionesta Lake.

Documented History (by the NGS)

Unknown by PADH (MONUMENTED)
01/01/1935 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1935 3 MI E FROM TIONESTA. ABOUT 3.0 MILES EAST ALONG STATE HIGHWAY 66 FROM THE COUNTY COURTHOUSE AT TIONESTA, FOREST COUNTY, ABOUT 384 FEET WEST OF A 1-STORY WOODEN SCHOOLHOUSE, ABOUT 80 FEET NORTHWEST OF A 1-STORY WOODEN BUNGALOW, AT STATION 3-70+90, AT A 9-FOOT CULVERT, IN THE TOP OF THE SOUTHWEST WING WALL, 15 FEET SOUTH OF THE CENTER LINE OF THE HIGHWAY, AND ABOUT 1 FOOT LOWER THAN THE ROADWAY. A PENNSYLVANIA DEPARTMENT OF HIGHWAYS STANDARD DISK. NOTE-- THE DESCRIPTIONS FOR THE MARKS ON THIS LINE REFER TO THE 1935 LOCATION OF STATE HIGHWAYS 66 AND 666. THE PRESENT LOCATION OF THESE HIGHWAYS HAS BEEN RELOCATED DUE TO HIGH WATER OF THE TIONESTA DAM, THEREFORE MARKS FROM BM 4-58+70 TO Y-78 MAY OR MAY NOT BE RECOVERABLE DURING TIMES OF LOW WATER OF THE RESERVOIR. NOTE-- THE LOCATION OF STATE HIGHWAYS 66 AND 666, HAVE BEEN RELOCATED DUE TO HIGH WATER OF THE TIONESTA DAM, THEREFORE THE MARK MAY OR MAY NOT BE RECOVERABLE DURING TIMES OF LOW WATER OF THE RESERVOIR.

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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