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Details for Benchmark: HS4130

N 37° 42.283 W 121° 43.967 (NAD 83)

Altitude: 527.8

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

Location:
In ALAMEDA county, CA View Original Datasheet
Designation:
F 1259
Marker Type:
bench mark disk
Setting:
massive structures with deep foundations
Stability:
Most reliable and expected to hold position/elevation well.

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Found where described

[Photos:]
photofor reference
photoeye level
photomark

Found 1benchmark, 0 cache.

[Photos:]
photoHS4130

Found while caching!

Found while searching for a Geocache

I happened to stumble across this one when I pulled over to get my bearings.

Found F1259/1974 in good condition as described except, as others have noted, the tower was replaced with a larger tower slightly to the south, so the benchmark is in the removed tower's old footing.

N 37° 42.270 W 121° 43.987

Found F1259/1974 in good condition as described except, as others have noted, the tower was replaced with a larger tower slightly to the south, so the benchmark is in the removed tower's old footing.

[Photos:]
photoHS4130 Environment
Looking SE showing the mark's relation to the NE corner of the new tower and the building under the tower. Mark is to the right of my GPSr on top of the SW "corner" of the old footing in the foreground.
photoHS4130

Still in good shape.

[Photos:]
photophoto (3)
photophoto (2)

RECOVERED IN GOOD CONDITION DRDEAN 2005

[Photos:]
photoLandscape
photoHS4130

Located benchmark today about 1:30pm.
Green Peas

[Photos:]
photoF 1259.jpg

Located as described in 1974 description except structure has been moved just south. Benchmark still in original foundation at site.

T&J (Scoobywatchers)

[Photos:]
photoStructure F 1259
photoF 1259

Documented History (by the NGS)

01/01/1974 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1974 0.7 KM (0.45 MI) NE FROM LIVERMORE. 0.45 MILES NORTHEAST ALONG INTERSTATE HIGHWAY 580 FROM THE STATE HIGHWAY 84 (FIRST STREET) OVERPASS IN LIVERMORE, AT THE CROSSING OF A STEEL TOWER POWERLINE, 148.5 FEET SOUTHEAST OF THE SOUTHEAST MOST CENTERLINE OF THE EAST BOUND HIGHWAY LANES, 59.5 FEET SOUTHEAST OF THE CENTERLINE OF A FRONTAGE ROAD, IN THE TOP OF THE SOUTHWEST SIDE OF THE CONCRETE FOUNDATION FOR THE SOUTHWEST STEEL LEG OF A TOWER, 27 FEET NORTHEAST OF THE CENTERLINE OF A DIRT ROAD LEADING SOUTHEAST, 0.3 FOOT SOUTHWEST OF THE SOUTHWEST STEEL TOWER LEG, AND ABOUT 1.5 FEET HIGHER THAN THE HIGHWAY.

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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