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Details for Benchmark: HS2776

N 37° 12.983 W 121° 44.400 (NAD 83)

Altitude: 257.54

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

Location:
In SANTA CLARA county, CA View Original Datasheet
Designation:
P 19
Marker Type:
bench mark disk
Setting:
mat foundation, concrete slab, etc.
Stability:
Probably hold position/elevation well.

Must Read!

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No access to base of water tank. Completely fenced off.

[Photos:]
photoimage
photoimage

Geoides’ pictures of the tank were so interesting that this was a “must see” on our list. Unfortunately, access to the legs is now fenced off (see photos) and there is a “No Trespassing” sign so we were unable to see or recover the mark.

The tank is a wonderful old riveted iron structure – hopefully it will stay around for a long time.

Congratulations to Marky for posting the first photos of the mark in 2002.

[Photos:]
photoTank at HS2776 location - Looking east-southeast.
Note the increased fencing compared to the earlier logged photos.
photoTank at HS2776 location - Looking southward.
photoExterior & interior legs of tank @ HS2776 location

Recovered this benchmark in good condition. I'd have to echo the previous finder's remarks being that this is quite possibly The Oldest benchmark in the greater Bay Area!

[Photos:]
photoBenchmark P19 1919 (HS2776)
photoBenchmark and Concrete Footing
photoWater Tower

Pretty neat, this may be the oldest benchmark I have done so far, not that I've done many. Interesting location too. Marky's coords were right on or close enough, its tough to get good EPE under a huge water tank. At first I thought the tank was dripping on my head but it turned out to be the start of a good rainshower! :) The disk looks like it - and the concrete surface around it - have seen better days but everything is still solid and legible, marked P-19 1919.

[Photos:]
photoHS2776
photoBase of support
photoOld railroad water tank

Stopped by this one on my way home today. Found in fairly good condition. Took a few pictures while I was there. My first benchmark!

[Photos:]
photoHS2776 Close Up
A close up view of the marker
photoTower Leg
A view of the tower leg that the marker is attached to.
photoTower View
A view of the tower from the NE about 200 feet away. Taken from the bait shop parking lot.
photoME!
A picture of me....taking a picture of....well, me :-)
N 37° 12.997 W 121° 44.419

Wasn't sure if this one would be accessible, but there was a break in the fences and we were able to get under the water tower. The leg that the benchmark was on was overgrown with brush so we had to clear it away to find it. The Benchmark is in fair condition.

[Photos:]
photoHS2776
HS2776 Benchmark
photoLeg of water tower
Here is the base of the leg of the water tower.
photoWater Tower
Looking south, towards the water tower.

Documented History (by the NGS)

01/01/1919 by CGS (MONUMENTED)
01/01/1953 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1953 AT COYOTE. AT COYOTE, ABOUT 45 YARDS NORTHWEST OF THE NORTHWEST END OF THE SOUTHERN PACIFIC COMPANY RAILROAD STATION, AT A LARGE SOUTHERN PACIFIC COMPANY WATER TANK, IN TOP OF THE SOUTH CORNER OF THE SOUTH ONE OF FOUR CONCRETE BASES SUPPORTING THE STEEL LEGS AT THE CENTER OF THE TANK, 50.4 FEET NORTHEAST OF THE NORTHEAST RAIL OF THE NORTHEAST TRACK, ADN 1 FOOT ABOVE THE GROUND.
01/01/1969 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1969 RECOVERED IN GOOD CONDITION.
01/24/1987 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1987 (CLM) RECOVERED IN GOOD CONDITION.
11/18/1988 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1988 RECOVERED IN GOOD CONDITION. A NEW TO REACH FOLLOWS. 0.2 KM (0.10 MI) NORTHWESTERLY ALONG THE SOUTHERN PACIFIC RAILROAD FROM THE JUNCTION OF BLANCHARD ROAD IN COYOTE.
02/02/1990 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1990 RECOVERED IN GOOD CONDITION.
11/02/1992 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992 0.1 KM (0.05 MI) NORTHWESTERLY ALONG MONTEREY ROAD FROM THE POST OFFICE IN COYOTE, 0.2 KM (0.10 MI) SOUTHEAST OF THE INTERSECTION OF BLANCHARD ROAD, NEAR THE SOUTH CORNER OF THE SOUTHERN MOST CONCRETE FOOTING THAT SUPPORTS THE INNER 4 LEGS OF A WATER TOWER, 43.6 M (143.0 FT) SOUTHWEST OF AND LEVEL WITH THE CENTERLINE OF THE SOUTHBOUND LANES OF THE ROAD, 15.3 M (50.2 FT) NORTHEAST OF THE NEAR RAIL OF THE SOUTHERN PACIFIC RAILROAD, AND 0.2 M (0.7 FT) ABOVE THE GROUND SURFACE.

Control Text

  • The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in February 1993.
  • The geoid height was determined by GEOID99.
  • The dynamic height is computed by dividing the NAVD 88 geopotential number by the normal gravity value computed on the Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45 degrees latitude (G = 980.6199 gals.).
  • The modeled gravity was interpolated from observed gravity values.

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