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Details for Benchmark: FV0384

N 35° 21.083 W 120° 38.150 (NAD 83)

Altitude: 1349.22

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

Location:
In SAN LUIS OBISPO county, CA View Original Datasheet
Designation:
H 25
Marker Type:
bench mark disk
Setting:
tunnels
Stability:
Probably hold position/elevation well.

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Found at N35 21.097 W120 38.106 (10m acc). Can barely read the station designation - had to get the right camera angle. Cannot see the township stamping mentioned in the 1970 recovery. 'Coast and Geodetic Survey' stamping almost completely obscurred.

[Photos:]
photoFV0384 - San Luis Obispo, Ca
photoFV0384 - Setting

Documented History (by the NGS)

Unknown by CGS (MONUMENTED)
01/01/1970 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1970 3.8 MI SW FROM SANTA MARGARITA. 1.4 MILES SOUTHWEST ALONG STATE HIGHWAY 58 FROM THE POST OFFICE AT SANTA MARGARITA, THENCE 1.75 MILES SOUTHWEST ALONG U.S. HIGHWAY 101, THENCE 0.65 MILE SOUTH ALONG THE SOUTHERN PACIFIC RAILROAD, 0.2 MILE SOUTH OF A U.S. HIGHWAY 101 OVERPASS, SET VERTICALLY IN THE WEST FACE OF THE EAST CONCRETE WALL OF TUNNEL NO. 6, RAILROAD MILEAGE 239.5, 6.0 FEET EAST OF THE EAST RAIL, 0.9 FOOT SOUTH OF THE NORTH END OF THE WALL, AND ABOUT 3 FEET HIGHER THAN THE TRACK. NOTE-- THE MARK IS NOW STAMPED H 25. T 30 S, R 12 E.
01/01/1977 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1977 RECOVERED IN GOOD CONDITION.
01/30/1989 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1989 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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