Details for Benchmark: JW1695
N 39° 40.967 W 079° 00.083 (NAD 83)
Coordinates may not be exact. Altitude is ADJUSTED and location is SCALED. (more info)
- In GARRETT county, MD View Original Datasheet
- SHA 201
- Marker Type:
- survey disk
- abutments and piers of large bridges
- Probably hold position/elevation well.
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Documented History (by the NGS)
|01/01/1992 by MDSHA (MONUMENTED)
|DESCRIBED BY MARYLAND DOT HIGHWAY ADMINISTRATION 1992
THE MARKER IS LOCATED ABOUT 4.3 MI (6.9 KM) WEST-NORTHWEST OF FROSTBURG, 8.3 MI (13.4 KM) EAST OF GRANTSVILLE, AND 1.4 MI (2.3 KM) EAST OF ZION CHURCH. IT IS LOCATED ON INTERSTATE HIGHWAY 68 RIGHT-OF-WAY. TO REACH THE STATION FROM THE COURT HOUSE IN CUMBERLAND, GO WEST ON WASHINGTON STREET FOR 0.2 MI (0.3 KM) TO A CROSSROADS. TURN LEFT AND GO SOUTH ON LEE STREET FOR 0.25 MI (0.40 KM) TO THE ENTRANCE TO THE WESTBOUND LANE OF INTERSTATE HIGHWAY 68. ENTER THE WESTBOUND LANE ON INTERSTATE HIGHWAY 68 AND GO WEST FOR 13.4 MI (21.6 KM) TO A POINT WHERE STATE HIGHWAY 546 CROSSES OVER INTERSTATE HIGHWAY 68. CONTINUE WEST ON INTERSTATE HIGHWAY 68 FOR 1.85 MI (2.98 KM) TO THE MARKER ON THE RIGHT. THE POINT IS MARKED WITH A MARYLAND STATE HIGHWAY ADMINISTRATION SURVEY DISK, CEMENTED IN A DRILL HOLE IN THE WEST END OF A BACKWALL WHICH IS PART OF THE MOST NORTHERLY ABUTMENT FOR A BRIDGE NUMBERED 11043 WHERE OLD FROSTBURG ROAD CROSSES OVER INTERSTATE HIGHWAY 68. IT IS 0.6 FT (18.3 CM) NORTH OF THE MOST NORTHERLY BRIDGE EXPANSION JOINT, 2.6 FT (0.8 M) EAST OF THE EAST BASE OF THE MOST WESTERLY BRIDGE PARAPET WALL, 12.5 FT (3.8 M) WEST OF THE CENTERLINE OF OLD FROSTBURG ROAD, 27.5 FT (8.4 M) SOUTH OF THE NORTH END OF THE MOST WESTERLY BRIDGE PARAPET WALL, AND 42.0 FT (12.8 M) SOUTH OF THE CENTER OF A DROP INLET. IT IS ABOUT LEVEL WITH THE SURFACE OF THE HIGHWAY.
- 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.