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Details for Benchmark: NC0670

N 42° 14.025 W 079° 46.814 (NAD 83)

Altitude: 825.38

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

Location:
In ERIE county, PA View Original Datasheet
Designation:
ORTON
Marker Type:
triangulation station disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

Reference Points

Must Read!

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The station mark and Reference Marks 1 and 2 were not recovered. All bridge curbing has been removed.
A National Geodetic Survey reference mark disk stamped ---ORTON 1961 NO 3 1982--- was recovered in the top of the north end of the west banister of the eastbound overpass bridge of Interstate Highway 90 over U.S. Highway 20. A National Geodetic Survey reference mark disk stamped ---ORTON 1961 NO 4 1983--- was recovered in the top of the west banister of the westbound overpass bridge of Interstate 90 over Highway 20, 4 inches north of the first banister joint from the north end.

took a while to find, but its there in good shape

Documented History (by the NGS)

01/01/1961 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1961 (RWT) THE STATION IS LOCATED ABOUT 4-1/2 MILES SOUTHWEST OF RIPLEY, NEW YORK, 3.0 MILES EAST-NORTHEAST OF NORTH EAST, 1.0 MILE WEST OF THE NEW YORK-PENNSYLVANIA STATE LINE AND AT THE INTERSECTION OF INTERSTATE 90 AND U.S. HIGHWAY 20. IT IS ON PROPERTY OWNED BY THE STATE OF PENNSYLVANIA. TO REACH THE STATION FROM THE JUNCTION OF STATE HIGHWAY 89 AND U.S. HIGHWAY 20 AT THE SOUTHEAST CORNER OF THE PARK IN NORTH EAST, GO SOUTHEASTERLY ON U.S. HIGHWAY 20 FOR 2.9 MILES TO THE JUNCTION OF INTERSTATE 90 AND THE STATION ON THE LEFT AT THE NORTHEAST CORNER OF THE BRIDGE ON THE WEST BOUND TRAFFIC LANE. STATION, IS A STANDARD DISK SET IN A DRILL HOLE IN THE TOP OF THE CURBING AT THE NORTHEAST END OF BRIDGE WHICH PROJECTS ABOUT 6 INCHES ABOVE THE SURFACE OF HIGHWAY, STAMPED ORTON 1961. IT IS 29.8 FEET WEST OF THE APPROXIMATE CENTER OF THE WEST BOUND LANE OF INTERSTATE 90, 9.4 FEET NORTH OF THE NORTHEAST CORNER OF BRIDGE, 2.5 FEET EAST OF A GUARD RAIL. REFERENCE MARK 1, IS A STANDARD DISK SET IN A DRILL HOLE IN THE SOUTH CURBING OF THE WEST BOUND LANE OF INTERSTATE 90 WHICH PROJECTS ABOUT 6 INCHES ABOVE THE SURFACE OF THE HIGHWAY, STAMPED ORTON NO 1 1961. IT IS 16.3 FEET EAST OF THE APPROXIMATE CENTER OF THE WEST BOUND LANE OF INTERSTATE 90 AND 3.4 FEET NORTH OF THE SOUTHEAST END OF BRIDGE. REFERENCE MARK 2, IS A STANDARD DISK SET IN A DRILL HOLE IN THE FLOOR OF THE BRIDGE OVER U.S. HIGHWAY 20 WHICH IS FLUSH WITH THE BRIDGE FLOOR, STAMPED ORTON NO 2 1961. IT IS 26.7 FEET WEST OF THE APPROXIMATE CENTER OF THE WEST BOUND LANE OF INTERSTATE 90, 18.6 FEET SOUTH-SOUTHWEST OF THE NORTHWEST CORNER OF THE BRIDGE AND 8 INCHES EAST OF THE WEST CURBING. HEIGHT OF LIGHT ABOVE STATION MARK 1 METER.
01/01/1961 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1961 2.9 MI NE FROM NORTHEAST. TO REACH THE STATION FROM THE JUNCTION OF STATE HIGHWAY 89 AND U.S. HIGHWAY 20 AT THE SOUTHEAST CORNER OF THE PARK IN NORTH EAST, GO SOUTHEASTERLY ON U.S. HIGHWAY 20 FOR 2.9 MILES TO THE JUNCTION OF INTERSTATE 90 AND THE MARK ON THE LEFT AT THE NORTHEAST CORNER OF THE BRIDGE OF THE WEST BOUND LANE OF INTERSTATE 90. IT IS 29.8 FEET WEST OF THE APPROXIMATE CENTER OF THE WEST BOUND LANE OF INTERSTATE 90, 9.4 FEET NORTH OF THE NORTHEAST CORNER OF BRIDGE AND 2.5 FEET EAST OF A GUARD RAIL.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in January 1999.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in June 1991.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • 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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