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Details for Benchmark: JS0763

N 38° 48.550 W 121° 12.667 (NAD 83)

Altitude: 311.75

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

Location:
In PLACER county, CA View Original Datasheet
Designation:
M 1200
Marker Type:
bench mark disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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Documented History (by the NGS)

01/01/1969 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1969 5.9 MI NE FROM ROSEVILLE. 5.9 MILES NORTHEAST ALONG THE SOUTHERN PACIFIC COMPANY RAILROAD FROM THE STATION AT ROSEVILLE, 0.1 MILE SOUTHWEST OF THE CROSSING OF BANKHEAD ROAD, IN THE TOP AND 0.9 FOOT NORTHWEST OF THE SOUTHEAST END OF THE SOUTHWEST CONCRETE ABUTMENT OF BRIDGE 112.51, 19.6 FEET SOUTHEAST OF THE SOUTHEAST RAIL OF THE WEST BOUND TRACK, AND ABOUT 1 1/2 FEET LOWER THAN THE TRACK.
11/11/1988 by USPSQD (MARK NOT FOUND)
RECOVERY NOTE BY US POWER SQUADRON 1988 (EH) MARK NOT FOUND.

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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