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Details for Benchmark: JT0132

N 38° 02.867 W 122° 07.667 (NAD 83)

Altitude: 87.3

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

Location:
In SOLANO county, CA View Original Datasheet
Designation:
F 557
Marker Type:
bench mark disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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Documented History (by the NGS)

01/01/1956 by CGS (MONUMENTED)
01/01/1958 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1958 1.9 MI E FROM BENECIA. 1.9 MILES EAST ALONG THE SOUTHERN PACIFIC COMPANY RAILROAD FROM THE STATION AT BENECIA, THENCE ABOUT 75 YARDS NORTHWEST, AT THE NORTHWEST END OF STEEL TRUSS BRIDGE 33.31 OVER CARQUINEZ STRAIT, IN THE TOP OF THE SOUTHEAST END OF THE SOUTHWEST CONCRETE GUARD WALL OF THE NORTHWEST APPROACH TO THE BRIDGE, 9.0 FEET SOUTHWEST OF THE SOUTHWEST RAIL OF THE SOUTHWEST TRACK, AND 3 FEET HIGHER THAN THE TRACK.
01/01/1964 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1964 RECOVERED IN GOOD CONDITION.
01/01/1989 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1989 (JRM) RECOVERED IN GOOD CONDITION.

Control Text

  • The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.
  • The geoid height was determined by GEOID99.

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