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Details for Benchmark: JS2355

N 38° 33.633 W 121° 30.900 (NAD 83)

Altitude: 40.1

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

Location:
In SACRAMENTO county, CA View Original Datasheet
Designation:
P 1102
Marker Type:
bench mark disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

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Mark was found in 2004 by CalTrans.

It may be there...it may not be there. There are thick layers of pine needles in the area and requires extensive searching to determine that benchmark has been destroyed. I may come back when weather or grooming removes or diminishes the pine needle cover.

I did find a mile pole, but it is mile '2' instead of mile '91'. It is old and probably been remiled with a different starting point. See photo.

I did find an emptied concrete circular foundation that may have had the benchmark disk on it. See photo.
47Dad47

[last edit: 10/3/2003 10:29:39 PM PST]

[last edit: 10/3/2003 10:30:53 PM PST]

[Photos:]
photoMilepost 2 may be the old milepost 91.
photoCould this road have been paved over the benchmark?
photoThis could be the concrete post the benchmark was sitting on.
But alas, only a single nail is standing embedded in the top.

Documented History (by the NGS)

01/01/1960 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1960 1.4 MI S FROM SACRAMENTO. 1.45 MILES SOUTH ALONG THE SOUTHERN PACIFIC RAILROAD FROM THE CROSSING OF CAPITOL AVENUE AT SACRAMENTO, NEAR THE SOUTH TIP OF MILLER PARK, 37 FEET SOUTH-SOUTHWEST AND ACROSS THE TRACK FROM MILEPOLE 91, 12.1 FEET SOUTHWEST OF THE SOUTHWEST RAIL, 7 FEET EAST OF THE SOUTHEAST ONE OF A GROUP OF THREE SMALL TREES, 1.5 FEET SOUTHWEST OF A WITNESS POST, ABOUT 3 1/2 FEET LOWER THAN THE TRACK, AND SET IN THE TOP OF A CONCRETE POST PROJECTING 0.4 FOOT ABOVE THE GROUND.

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  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.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