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Details for Benchmark: JS0758

N 38° 47.467 W 121° 14.183 (NAD 83)

Altitude: 258.57

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

Location:
In PLACER county, CA View Original Datasheet
Designation:
J 1200
Marker Type:
bench mark disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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I found the benchmark easily. I was in the area so I thought I would try to find it.

Documented History (by the NGS)

01/01/1969 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1969 4 MI NE FROM ROSEVILLE. 3.95 MILES NORTHEAST ALONG THE SOUTHERN PACIFIC COMPANY RAILROAD FROM THE STATION AT ROSEVILLE, AT ROCKLIN, AT THE CROSSING OF ROCKLIN ROAD, IN THE TOP OF A 12- BY 25-FOOT GRANITE OUTCROP WHICH PROJECTS ABOUT 1 FOOT ABOVE THE GROUND, 104 FEET SOUTHEAST AND ACROSS RAILROAD AVENUE FROM THE SOUTHEAST RAIL OF THE SOUTHEAST TRACK, 46 FEET SOUTHEAST OF THE CENTER LINE OF RAILROAD AVENUE, 100 FEET NORTHEAST OF THE CENTER LINE OF ROCKLIN ROAD, 58.6 FEET SOUTHWEST OF THE WEST CORNER OF A WHITE STUCCO HOUSE, 106.6 FEET NORTHWEST OF THE NORTH CORNER OF ROCKLIN FIRE DEPARTMENT BUILDING, 67 FEET NORTHEAST OF A POWER POLE BEARING A STREET LIGHT AND THREE GUY WIRES, ABOUT 4 FEET HIGHER THAN THE AVENUE, AND 7 FEET HIGHER THAN THE TRACK.
01/01/1975 by CADH (GOOD)
RECOVERY NOTE BY CA DIV OF HIGHWAYS 1975 RECOVERED IN GOOD CONDITION.
01/01/1982 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982 THE FIRE HOUSE IS NOW A BODY SHOP AND THE WHITE STUCCO HOUSE IS NOW PALE YELLOW.
01/01/1986 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1986 (EJH) RECOVERED IN GOOD CONDITION.
07/11/1989 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1989 (EH) 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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