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Details for Benchmark: MB0157

N 41° 56.600 W 080° 28.750 (NAD 83)

Altitude: 701.48

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

Location:
In ERIE county, PA View Original Datasheet
Designation:
M 273
Marker Type:
bench mark disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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The mark is in good condition at N 41° 56.608 W 080° 28.754. Add to description, the mark is set in the west end of the culvert headwall. The concrete is crumbling but the mark is solid. This is actually a very large culvert!

[Photos:]
photoMB0157(M 273) - Springfield Twp Erie County PA
photoMB0157 - Eye level
photoMB0157 - Looking W from mark

Documented History (by the NGS)

01/01/1961 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1961 1.2 MI SW FROM WEST SPRINGFIELD. ABOUT 0.8 MILE WEST ALONG INTERSTATE HIGHWAY 90 FROM THE JUNCTION OF U.S. HIGHWAY 6N AND INTERSTATE HIGHWAY 90. IT IS DRILLED IN A SMALL CULVERT 5.0 FEET LOWER THAN THE HIGHWAY. IT IS 0.1 MILE EAST OF AN OVERHEAD BRIDGE, AND 47.0 FEET NORTH OF THE CENTER OF THE WEST BOUND LANE OF TRAFFIC.
01/01/1975 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1975 RECOVERED IN GOOD CONDITION.

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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