Skip to Content

Details for Benchmark: JT0138

N 38° 03.367 W 122° 07.700 (NAD 83)

Altitude: 38.7

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

Location:
In SOLANO county, CA View Original Datasheet
Designation:
1 QMC
Marker Type:
survey disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

Must Read!

Benchmarks may be on private property or in dangerous locations. Obey local laws. By using the services on Geocaching.com you agree to this disclaimer.

Documented History (by the NGS)

Unknown by DOD (MONUMENTED)
01/01/1956 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1956 AT BENICIA ARSENAL. AT BENICIA, ALONG THE SOUTHERN PACIFIC COMPANY RAILROAD, 0.6 MILE NORTH OF THE NORTHWEST END OF STEEL TRUSS BRIDGE 33.31 OVER THE SUISUN BAY, 5 RAILS SOUTH OF MILEPOST 35, AT A CONCRETE RAILROAD BRIDGE OVER BAYSHORE DRIVE, IN THE TOP OF THE APPROXIMATE CENTER OF THE SOUTHWEST CONCRETE WING WALL, 19.3 FEET WEST OF THE WEST RAIL OF THE NORTH BOUND TRACK, AND ABOUT 1/2 FOOT LOWER THAN THE TRACK.
01/01/1964 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1964 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  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.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.

Advertising with Us

Return to the Top of the Page