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Details for Benchmark: AH5766

N 37° 16.417 W 121° 53.767 (NAD 83)

Altitude: 162

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

Location:
In SANTA CLARA county, CA View Original Datasheet
Designation:
Q 1122 RESET
Marker Type:
vertical control disk
Setting:
mat foundation, concrete slab, etc.
Stability:
May hold, but of type commonly subject to surface motion.

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Quick find using WERDAVE's coordinates. The benchmark is in good shape. The original light pole, not so much.

[Photos:]
photoQ 1122 closeup
photoQ 1122 setting
N 37° 16.435 W 121° 53.785

Even with the past logs, it took me a little to find it, partly I think because the "smoothing" of the curve has caused some of the references to be a little off. However, it was right next to a power pole as described in earlier logs. Still a bit of a mystery to me how one can have a horizontally placed "vertical control mark," but I guess it works.

[Photos:]
photoAH5766-Q1122

Can't beleive it's taken me so long to come and find this.
Walked around for awhile looking for this and then read a previous log about the BM being by the power pole in the N.W. corner and found it right after that.
Benchmark in great shape!

[Photos:]
photoAH5766
Left my usual picture at home, had to make do!

Found with my mom. I am new to this.

Found today with my daughter, SHHR. Forgot the camera though.

A few weeks ago I found the City marker in the middle of the intersection. Today I found the benchmark itself, my first benchmark find.

Instructions + GoogleEarth = easy find :-)

[Photos:]
photoAH5766

Easy find, my first benchmark!

I had to check three corners before I found this because of the conflicting info in logs and recoveries, including the latest recovery note in the real NGS database that's not shown here. In any case, it's about 5.5' from the power pole that's NW of the center of the intersection.

[Photos:]
photoAH5766

Had some trouble finding it the first time out because my GPS led me to a plaque in the middle of an interesection near by that said "City Monument". I thought this was it and logged it, only to discover after looking at photos it wasn't. Went back and got it the next day.

As decribed. pic to follow. Semi-Hex.

Found this benchmark by luck or accident. I saw that it hadn't been found even with diligent search. So my expectations were low. But I parked within 10 feet of it, and happened to see it as I stepped out of the car. The lightpost #16L134 apparently has moved. All that remains is the foundation for the lightpost with its 4 studs exposed and of course the embedded benchmark. The documented history description seems accurate aside from the missing streetlight.

[Photos:]
photoAH5766-1
Close up shot of benchmark
photoAH5766-2
Lightpost base minus the relocated lightpost

This one was curious. I found lightpost 16L134, but this was south-east of foxworthy, not north-west. No benckmark in the base. If you use the description (NW of Foxworthy, SW of Booksin), you end up at lightpost 16L242. The base of this post is completely covered with Juniper bushes. I pushed them away from the east corner of the base, but no benchmark there either. This intersection has changed a lot since 1976, so it may be been removed.

[Photos:]
photoLightpost
Lightpost 16L134
photoBase
Base of the lightpost, no benchmark

Documented History (by the NGS)

01/01/1976 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1976 2.2 MILES (3.5 KM) SOUTHEAST ALONG THE SOUTHERN PACIFIC COMPANY RAILROAD FROM THE STATION AT SAN JOSE, THENCE 2.0 MILES (3.2 KM) SOUTH ALONG ALMADEN ROAD, THENCE 1.05 MILES (1.69 KM) WEST ALONG FOXWORTHY AVENUE, AT THE INTERSECTION OF JARVIS AVENUE LEADING SOUTH AND BOOKSIN AVENUE LEADING NORTHWEST, IN THE TOP OF THE 2X3 FOOT CONCRETE BASE FOR LIGHT POLE 16L134, 147 FEET (44.8 M) NORTHWEST OF THE CENTERLINE OF FOXWORTHY AVENUE, 19.0 FEET (5.8 M) SOUTHWEST OF THE CENTERLINE OF BOOKSIN AVENUE, AND ABOUT 1/2 FOOT HIGHER THAN THE AVENUE, 0.5 FEET (15.2 CM) WEST OF THE EAST CORNER OF THE POLE BASE.

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.