Details for Benchmark: MC0470
N 41° 07.833 W 083° 17.117 (NAD 83)
Coordinates may not be exact. Altitude is ADJUSTED and location is SCALED. (more info)
- In SENECA county, OH View Original Datasheet
- BM RESET
- Marker Type:
- survey disk
- abutments and piers of large bridges
- Probably hold position/elevation well.
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Documented History (by the NGS)
|01/01/1939 by USGS (MONUMENTED)
|01/01/1968 by NGS (GOOD)
|DESCRIBED BY NATIONAL GEODETIC SURVEY 1968
AT BASCOM. AT BASCOM, ABOUT 0.3 MILE SOUTH ALONG STATE HIGHWAY 635 FROM THE CROSSING OF THE BALTIMORE AND OHIO RAILROAD, ABOUT 0.2 MILE SOUTH OF THE INTERSECTION OF STATE HIGHWAY 18, SET IN THE TOP OF THE WEST END OF THE SOUTH ABUTMENT OF A 60-FOOT CONCRETE BRIDGE OVER THE EAST BRANCH OF WOLF CREEK, 18 FEET WEST OF THE CENTER LINE OF THE HIGHWAY AND ABOUT LEVEL WITH THE HIGHWAY.
|10/22/1992 by NGS (GOOD)
|RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
9.0 KM (5.60 MI) WESTERLY ALONG THE CHESSIE SYSTEMS RAILROAD FROM THE JUNCTION OF STATE HIGHWAY 53 IN TIFFIN, THENCE 0.5 KM (0.30 MI) SOUTHERLY ALONG STATE HIGHWAY 635, IN TOP OF AND 0.15 M (0.49 FT) EAST OF THE WEST END OF THE SOUTH CONCRETE ABUTMENT OF A HIGHWAY BRIDGE SPANNING WOLF CREEK, 5.8 M (19.0 FT) WEST OF AND LEVEL WITH THE CENTER OF THE HIGHWAY, AND 0.15 M (0.49 FT) SOUTH OF THE NORTH EDGE OF THE ABUTMENT.
- 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 April 1995.
- 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.