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Details for Benchmark: HS5358

N 37° 08.770 W 121° 39.012 (NAD 83)

Altitude: 370.9

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

Location:
In SANTA CLARA county, CA View Original Datasheet
Designation:
M 357
Marker Type:
spike
Setting:
driven into the ground
Stability:
Mark of questionable or unknown stability.

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Remarked since 2009 -- "GPS" no longer there, but now has both the BM and GC.com ID. Saw it as I drove up, so didn't park on top of it!

[Photos:]
photoHS5358

In the road. Curb writing made it easy to spot.

Easy to miss from wrong angle in sunlight. Easy from better angle.

[Photos:]
photoimage
photoimage

It helps to find this if you do NOT park on it! :)

[Photos:]
photoHS5358

Found at N37 08.770 W121 39.012

[Photos:]
photoHS5358 - Morgan Hill, Ca
photoHS5358 - Setting

The coordinates were right on. I was showing about a 5 foot difference, which is below the resolution of the GPS. I thought at first the spike might have been paved over, but there it was.

[Photos:]
photoTowards the curb
photoLooking South
photoLooking North

The paint has been freshened up and the lovely three letters "GPS" have been added :)

[Photos:]
photoHS5358

Stopped while driving through on my way to Hollister.

Exactly as described, my first railroad spike! :)

Yes, we found it. Now to what job should I bill my time.

Found while doing a survey nearby. Railroad spike in very good condition with faint paint mark verifying M357. Located about 50' north of centerline of nearby driveway and fire hydrant just south of driveway.

37 deg 08.777
121 deg 39.025
WGS-84 coordinates

[last edit: 10/7/2002 1:28:37 PM PST]

[Photos:]
photoM357 looking east
photoRailroad spike closeup
photoM357 with faint surveyors paint marks

Documented History (by the NGS)

01/01/1988 by CREDAN (MONUMENTED)
DESCRIBED BY CREEGAN AND D ANGELO 1988 THE STATION IS LOCATED IN THE MORGAN HILL BUSINESS PARK OFF COCHRAN ROAD, IN THE CITY OF MORGAN HILL. TO REACH THE STATION FROM THE INTERSECTION OF COCHRAN ROAD AND MONTEREY HIGHWAY, GO EAST ON COCHRAN ROAD, APPROXIMATELY 0.8 KM (0.50 MI) TO SUTTER AVENUE. GO SOUTH ON SUTTER AVENUE TO JARVIS AVENUE THEN EAST ON JARVIS AVENUE TO STATION. THE STATION IS 2.1 M (6.9 FT) WEST OF THE EAST FACE OF CURB AND 152.4 M (500.0 FT) SOUTH OF THE BUILDING AT 685 JARVIS AVENUE. THE MARK IS A RAILROAD SPIKE SET FLUSH WITH THE ROAD SURFACE.

Control Text

  • The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in March 1994. The horizontal coordinates are valid at the epoch date displayed above. The epoch date for horizontal control is a decimal equivalence of Year/Month/Day.
  • 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 X, Y, and Z were computed from the position and the ellipsoidal ht.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The ellipsoidal height was determined by GPS observations and is referenced to NAD 83.
  • The geoid height was determined by GEOID99.

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