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Details for Benchmark: AA1864

N 37° 02.314 W 121° 18.667 (NAD 83)

Altitude: 412

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

Location:
In SANTA CLARA county, CA View Original Datasheet
Designation:
HPGN D CA BELL
Marker Type:
survey disk
Setting:
aluminum alloy rod
Stability:
Probably hold position/elevation well.

Must Read!

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Found the benchmark and then the nearby cache. The lid of the benchmark doesn't appear to fully close, but I didn't try to force it. otherwise it's in good shape.

[Photos:]
photoBELL cover
photoBELL closeup

I came here for the geocache and was happy to find a BM. All is still in good condition.

[Photos:]
photoClose up
photoCover
photoSurroundings

Found the nearby cache long ago, but didn't record the benchmark. Rectified that oversight today.

Bell station! Named after me.

Found this benchmark while grabbing the nearby cache.

[Photos:]
photo2014-10-21 13.12.42

Spotted this calibration benchmark while finding the nearby cache here.

[Photos:]
photoBenchmark with GPSr
photoBenchmark in situ

Right near a cache.

Found with CarlottaP.

Oaknest and I spotted this benchmark while at the nearby cache, Bay Area Calibration Point #3.

[Photos:]
photoBenchmark BELL

Found this benchmark while geocaching, at GCVRXT, Bay Area Calibration Point #3.

[Photos:]
photoBenchmark HRGN-D 1992

Found this benchmark for the "Bay Area Calibration Point #3" geocache.

16:00. On the way back to San Jose from Springville. Finally had the time to stop at Bell Station for the GeoCache and this, my first Benchmark.

Found after a morning hike out to Dowdy and back.

[Photos:]
photoBM
photoBM placement
photoGeneral area of BM

Found this benchmark while finding the nearby geocache.

[Photos:]
photoAA1864

Marker in good shape, easy to read after a thin layer of mud was rubbed off. A few hours later, I wished I had someone to scrape a much thicker layer of Warrior Dash mud off me!

[Photos:]
photoGeocaching at this Survey Disc 10/29/2011

Out for a weekend of Birthday caching. We found this one when we found the nearby cache.

Found with Elk Grove Treasure Hunters while heading to Monterey. The BM was swimming, so EGTH bailed out as much water as he could so I could get my photos.

[Photos:]
photoa 002
the disk up close
photoa 003
disk plus lid
photoa 004
the wide shot

Just started Geocaching 2 days ago , on our way to the Renaissance Faire I stopped for the Cache hidden and spotted the BM here also, never knew these might make a difference in my stats but I guess now I do.

We found this one when we found the nearby cache.

Located in good condition while logging the nearby Bay Area Calibration Point #3 cache.

We don't generally actively search out benchmarks, but, if we trip over one while searching out a cache, what are we gonna do?

Bay Area Calibration Point #3 takes you right to it... got to love the two for one deals

Found while going after Bay Area Calibration Point #3

Found while going after Bay Area Calibration Point #3 - which was about 3 feet away.

found while finding Bay Area Calibration Point #3

Conveniently located near a cache. Or vice versa.

Found this while finding the nearby cache.

It's hard to miss when you are looking for a nearby cache.

Found this one while grabbing the cache nearby.

[Photos:]
photoAA1864 close up
photoAA1864 view

Found this benchmark while locating a nearby cache.

Found on a trip to Monterey from Sacramento. Liked the calibration cache nearby.

[Photos:]
photoBM AA1864

Found this one while finding a cache very close by. Funny thing, you can see both the benchmark and the cache in the picture by 'russellvt' below. Cool. :)

Found this as part of logging a nearby geocache. Saw our first roadrunner running up this dirt road!

Found as part of cache. (BM#1)

found while grabbing the cache!

next to cache..

Found while caching for Bay Area Calibration Point #3 geocache.

TFTC! On the drive home from Yosemite to Santa Cruz, the Cachemanian Devils (50sumtin, Grindylow, and Pink Static) stopped along the way to find a few caches. This was a bonus benchmark.

TFTC! On the drive home from Yosemite to Santa Cruz, the Cachemanian Devils (50sumtin, Grindylow, and Pink Static) stopped along the way to find a few caches. This was a bonus benchmark.

N 37° 02.315 W 121° 18.667

TFTC! On the drive home from Yosemite to Santa Cruz, the Cachemanian Devils (50sumtin, Grindylow, and Pink Static) stopped along the way to find a few caches. This was a bonus benchmark.

Yep, still there.

Nice 2 fer here.

While finding the nearby cache I took a close look at this benchmark, which was a style I hadn't seen before. Interesting.

Stopped for the cache and had to claim a find on the benchmark.

First one I saw that come with a cover.

Going back and logging now...found in October of last year.

Neat benchmark, nicely tucked away off an alternate entrance to Henry Coe...

[Photos:]
photoHPGN-D Benchmark
Sunset at HPGN-D outside of Henry Coe.

Start of our trek into Coe.

Found with my wife as part of the Bay Area Calibration Point #3 cache.

[Photos:]
photoHPGN D CA BELL marker, Bell Station, CA
photoHPGN D CA BELL location, Bell Station, CA

Found this one while waiting to enter Coe, for their back country weekend.
-Found as described

Found while doing the nearby calibration point geocache.

[Photos:]
photoBell calibration point, Hwy 152, CA

Heading east for some business, stopped for the nearby cache and for this.

One of many bench marks I have found and saw no reason to log previously.

N 37° 02.316 W 121° 18.669

Found as described.

Grabbed this benchmark before entering Henry Coe for a Volunteer job our company was performing.

Found this one while out geocaching.

Found while out with FlyDog for a day of caching. Didn't think this one would be in the database, but was surprised to find it is. BM in good condition, as described.

Found with tlharrell on a day log cache trip.

We found this HPGN survey marker with Geocaching and trying to locate the “Bay Area Calibration Point #3” cache. We had two GPSrs with us and posted our measurements on the cache page.

[Photos:]
photoGCVRXT.jpg

Found when looking for bullits calibration point

Hey! I found this over two years ago, but it wasn't listed on the benchmark page. I'll dig out my pics and download them later. This means the process works as I emailed NGS and told them about this being not listed in the normal sheets.

Grabbed this one just as we were leaving on the way out placed some new caches as well and was glad we were 3rd to log. It was in great shape too.

[Photos:]
photoDusty But cool lookin.

We noticed this BM was unlogged while planning our Coe backcountry weekend trip. Found in good condition and it will now be part of my Bay Area Calibration Point Series

[Photos:]
photodisk with cover open
photowitness post
BM is in the foreground

Found as described in good condition, marked by a witness post.

[Photos:]
photoOpen up!
photoAA1864
photoWider shot showing witness post and location
photoBullit checks his Magellan (*scoff*)

Documented History (by the NGS)

01/01/1992 by CA-085 (MONUMENTED)
DESCRIBED BY SANTA CLARA COUNTY CALIFORNIA 1992 (JLP) THE STATION IS LOCATED NEAR THE BELL STATION ROAD HOUSE, ABOUT 14 MI (22.5 KM) EAST OF THE CITY OF GILROY AND ABOUT 13 MI (20.9 KM) NORTHEAST OF THE CITY OF HOLLISTER. TO REACH THE STATION FROM THE JUNCTION OF U.S. HIGHWAY 101 AND STATE HIGHWAY 152 (EAST) IN THE CITY OF GILROY, GO EAST ON STATE HIGHWAY 152 FOR 11.9 MI (19.2 KM) TO THE JUNCTION OF STATE HIGHWAY 156. CONTINUE EAST ON STATE HIGHWAY 152 FOR 6.15 MI (9.90 KM) TO THE HIGHWAY BRIDGE (NO. 37-30) OVER CEDAR CREEK. CONTINUE EAST ON HIGHWAY 152 FOR 0.7 MI (1.1 KM) TO AN ACCESS ROAD ON THE LEFT (NORTH) SIDE OF THE HIGHWAY AT POST MILE 28.83. (THE ACCESS ROAD IS ABOUT 400 FT (121.9 M) WEST OF BELL STATION ROAD HOUSE.) TURN LEFT AND GO NORTH ON THE ACCESS ROAD FOR ABOUT 330 FT (100.6 M) TO A SIDE ROAD RIGHT AND THE END OF PAVEMENT. CONTINUE NORTHERLY ON A WELL GRADED DIRT/GRAVEL ROAD FOR ABOUT 0.1 MI (0.2 KM) TO THE STATION ON THE LEFT (NORTHWEST) SIDE OF THE ROAD. THE STATION IS A 2.5 INCH SANTA CLARA COUNTY SURVEYOR ALUMINUM DISK INSIDE A 6 INCH ALUMINUM ACCESS COVER FLUSH WITH THE GROUND, ABOUT 300 FT (91.4 M) SOUTHEAST OF A STEEL WATER TANK, ABOUT 100 FT (30.5 M) SOUTHWEST OF A DEEP GULLY, 53.5 FT (16.3 M) NORTH OF THE CENTERLINE OF THE DIRT/GRAVEL ROAD, 2.6 FT (0.8 M) SOUTHEAST OF A BARBED WIRE FENCE, 2.6 FT (0.8 M) SOUTHEAST OF A FIBERGLASS WITNESS POST, AND ABOUT 6 FT (1.8 M) HIGHER THAN THE ROAD. THE DISK IS 0.25 FT (0.08 M) BELOW THE ACCESS COVER AND THE ROD IS DRIVEN TO REFUSAL AT A DEPTH OF 5.6 FT (1.7 M) . THIS STATION WAS OCCUPIED AS PART OF A CALIFORNIA HIGH PRECISION GEODETIC NETWORK (HPGN) DENSIFICATION SURVEY.

Control Text

  • The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in September 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 orthometric height was determined by GPS observations and a high-resolution geoid model.
  • 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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