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Details for Benchmark: JT0137

N 38° 03.050 W 122° 08.850 (NAD 83)

Altitude: 44.8

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

Location:
In SOLANO county, CA View Original Datasheet
Designation:
F 790
Marker Type:
bench mark disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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Documented History (by the NGS)

01/01/1946 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1946 AT BENICIA. AT BENICIA, AT THE INTERSECTION OF EAST FIFTH STREET AND EAST M STREET, 98 YARDS WEST OF THE CENTER LINE OF EAST FIFTH STREET, 39 FEET NORTH OF THE CENTERLINE OF EAST M STREET, SET IN TOP OF THE NORTH HEADWALL OF A 8- BY 8-FOOT CONCRETE BOX CULVERT, 0.9 FOOT WEST OF THE EAST END OF THE HEADWALL AND ABOUT 7 FEET LOWER THAN THE SURFACE OF EAST M STREET. NOTE-- REPORTED IN 1962 - OLD HEADWALL IS COVERED OVER WITH ABOUT 7 FEET OF FILL, MAKING THE MARK NON-RECOVERABLE.
01/01/1964 by NGS (MARK NOT FOUND)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1964 MARK NOT FOUND.

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  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.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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