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Details for Benchmark: FV1580

N 35° 09.574 W 120° 45.273 (NAD 83)

Altitude: 75

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

Location:
In SAN LUIS OBISPO county, CA View Original Datasheet
Designation:
WHALER ISLAND
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:

Reference Points

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Two benchmarks close to each other--what a deal!

Found it.

Yeay!! I was really anticipating finding this one. Got to the port when the tide was still about +1/2 foot and had to scramble a few rocks (pillow lava actually). On my way back the tide was -1.7 feet and there was beach the whole way.

Previous logs have been in error: - this mark is not a disk mounted on a pipe.

This station is a drill hole and a triangle chiseled in a rock. It is just 27 inches south (198 deg) of FV1581 and covered with an inch or two of soil.. Please see my pic.

[Photos:]
photoFV1580 - Port San Luis, Ca
Drill hole inscribed with a chiseled triangle
photoFV1580
photoFV1580 & FV1581
View SE. Shows relationship between the two stations.
photoFV1580
with scale
photoWhalers Island - Port San Luis, Ca
View SE.
photoFV1580 - Creatures
On the way to FV1580
photoFV1580 - Creatures
On the way to FV1580
photoFV1580 - Creatures
On the way to FV1580
photoSunset from Avila Beach, Ca
View SW towards Whalers Island.

Stumbled upon this and the other benchmark while enroute the cache on Whalers Island. Great views.

Great location! found after going through a little PO.

Cachtopher and I were out finding Whaler's Island cache, and found both Bench marks. Pretty neat place! MR

Gotta do more benchmark hunting - there's something addicting about it!

[Photos:]
photo2nd

Found on top of Whalers Island. Intact and in good condition.

[This entry was edited by 4BACKRD on Wednesday, March 01, 2006 at 10:08:20 PM.]

[Photos:]
photoWhaler Island 1

Found this while looking for the cache. Although, my surveyor husband says this is actually a geodetic horizontal control point for Whalers Island. I'm taking credit anyway. He says he'd have to look at the NGS data sheet to see if it is actually a benchmark. Benchmarks usually say "benchmark" on them. I learned that benchmarks are for vertical measurements and control points are for horizontal measurements. Geocaching is also educational!

[Photos:]
photoSecond benchmark.
N 35° 09.574 W 120° 45.274

Found it. Hard to miss it. My 8 year old thought the raised maker was actually the cache at first.

[Photos:]
photoWhale Isle Benchmark 2
photoWhale Isle Benchmark 2 - Side View

Very easy to find since it is on a pedestal.
Only about 20 feet from the the other one on this island. Beautiful view.

What a nice hike.

There are two benchmark circular brass disks up here on top of Whalers Island. And there's also a geocache up here! Had a great time. The view is BEAUTIFUL!

Documented History (by the NGS)

01/01/1910 by CGS (MONUMENTED)
01/01/1933 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1933 (CP) THOROUGH SEARCH MADE FOR THIS STATION BUT NOT RECOVERED. PROBABLY MATERIAL REMOVED FROM THIS ISLAND IN CONSTRUCTION OF AVILA BREAKWATER AND STATION DESTROYED. RECOMMEND THAT THIS STATION BE DESCRIBED AS LOST.
01/01/1961 by CGS (MONUMENTED)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1961 (CTH) STATION RECOVERED AFTER INVERSE COMPUTATION FROM WHALER ISLAND 2 1933 (THE LATER BEING STAMPED WHALE ISLE NO 2 1933). PREVIOUS STATEMENT REFERING TO THE STATION IS CONTAINED IN A RECOVERY NOTE AND THE STATION CONSIDERED LOST IN 1933. RECOVERY CONSISTED OF A BURIED STONE WITH A FLAT-TOPPED SURFACE, BURIED 1 INCH BELOW THE SURFACE, IN WHICH IS DRILLED A HOLE 1/2 INCH IN DIAMETER TO A DEPTH OF 3/4 INCH, ABOUT WHICH IS INSCRIBED A TRIANGLE, AND NEARBY THE LETTERS U.S. THE RECOVERED STATION IS 2.27 FEET IN AZIMUTH 17 DEG - 03 MIN FROM WHALER ISLAND 2 1933. THE STATION CAN BE REACHED AFOOT AT LOW TIDE FROM THE MAINLAND NEAR THE LIGHT HOUSE. DISTANCE BETWEEN REFERENCE MARKS 45.25 FEET.
01/01/1976 by NGS (MONUMENTED)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1976 (RBM) THE STATION, STATION WHALER ISLAND 2 AND REFERENCE MARK 1, 1933 WERE RECOVERED IN GOOD CONDITION AS DESCRIBED BY THE HUSEMEYER BROTHERS IN 1961. REFERENCE MARK 2, 1933 WAS NOT RECOVERED AFTER A BRIEF SEARCH. AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN 2 MILES SW OF AVILA BEACH.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in June 1996. 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 scaled from a topographic map.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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