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Details for Benchmark: AI4534

N 33° 01.333 W 116° 26.350 (NAD 83)

Altitude: 2641.74

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

Location:
In SAN DIEGO county, CA View Original Datasheet
Designation:
SP 3
Marker Type:
survey disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

Must Read!

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On 1 January 1800, all of modern day California was still part of the Viceroyalty of Nuevo Espana. From 1821 to 1846, California was part of Mexico. In 1846, California became territory of the United States. The United States Geological Survey was established in 1879. The US Geological Survey has adopted assorted survey monuments established before their own survey work but I cannot determine who the monumenting entity, USE, is or why they surveyed a station in Neuvo Espana on New Year's Day 1800. (Perhaps they had been drinking the night before and hallucinated that they were future Americans?) Perhaps this is the oldest survey station (if not monument) in the Great State of California but a bit more work will be required before anyone has any clue when this station was first surveyed and who USE was.

N 33° 01.167 W 116° 26.368

Found as described. Metal witness post also as described.
Recovered in good condition.
The Fossillady

[Photos:]
photoSP 3
photoView looking south

This is the oldest benchmark I've ever found. I'll just assume that our government's official records are correct and this was indeed monumented in 1800.

[Photos:]
photoThe Disk
photoThe Location

By accident, overlanding to camp from Box canyon. It's a brass disc on a concrete pylon. Placed by the Army Corps of Engineers. Next to it is a steel stake with a tag from the San Diego County Engineer "Survey Marker #19" Coords N33 01.171, W116 26.339 (WGS84)

[This entry was edited by castlebrook on Tuesday, November 30, 2004 at 6:00:52 PM.]

I have been benchmark hunting for over a year. It is fun. It combines a scavenger hunt with real history. I find it fun to read the old descriptions to learn history and find out how much things have changed. This is the first time I am recording a benchmark find at geocaching.com/mark because this find maybe special. First of all, it would be wonderful to believe this benchmark is over 200 years old for the original datasheet indicates the benchmark was monumented in 1800. I have a little trouble believing this because there is little American/USA influence in this area until the 1840s. In fact the benchmark is beside the trail that has history going back to the 1840s. The trail has been known by several names, Butterfield Overland Stage Route, Sonora Colorado River Route, and the Southern Emigrant Trail. I hope someone else visits the site and gets a picture of the benchmark up close. Unfortunately this picture did not come out. I found the benchmark without a GPS, which is always more fun. And in this case a good thing because the benchmark is over 1000 feet from the published coordinates. Another question; the datasheet says the benchmark was monumented by USE. Who or what is USE?
Unfortunately I could only upload one picture. The benchmark is a classic brass disk on top of the cement monument in the lower right. The 150+ year old Butterfield Overland Stage Route is the immediate background and runs center left to the right and down a little. Many people travelled this trail over 150 years ago.

[This entry was edited by RockAndMjb on Thursday, February 19, 2004 at 7:01:50 PM.]

[This entry was edited by RockAndMjb on Thursday, February 19, 2004 at 7:03:05 PM.]

[Photos:]
photoButterfieldOverlandStageRoute.JPG

Documented History (by the NGS)

1/1/1800 by USE (MONUMENTED)
4/27/1995 by CADT (GOOD)
DESCRIBED BY CALTRANS 1995 (ATD) THE STATION IS LOCATED 10.1 MI (16.3 KM) EAST OF JULIAN, 6.0 MI (9.7 KM) SOUTH SOUTHEAST OF THE JUNCTION OF STATE ROUTE 78 AND COUNTY ROUTE S-2, KNOWN LOCALLY AS SCISSORS CROSSING, ABOUT 1300 FT (396.2 M) NORTH OF ROUTE S-2 AT POST MILE 25.4. TO REACH FROM THE JUNCTION OF STATE ROUTE 78 AND COUNTY ROUTE S-2, DRIVE SOUTHEAST ON S-2 FOR 5.9 MI (9.5 KM) TO A CURVE TO THE RIGHT IN A NARROW PASS. CONTINUE SOUTHWEST THEN WEST ON S-2 FOR 2.4 MI (3.9 KM) TO AN ASPHALT COVERED WASH ON THE LEFT, SOUTH, AND A SANDY WASH NORTH. THIS POINT IS 0.3 MI (0.5 KM) EAST OF THE BOX CANYON MONUMENT ON THE OLD OVERLAND STAGE ROUTE, AND THE END OF CAR TRAVEL. PROCEED ON FOOT NORTH UP SANDY WASH FOR 1000 FT (304.8 M) TO THE INTERSECTION OF AN ABANDONED DIRT ROAD ON THE LEFT, SOUTHWEST. TURN LEFT, SOUTHWEST ALONG DIRT ROAD FOR 300 FT (91.4 M) TO THE STATION MARK ON THE LEFT, EAST SIDE OF THE ROAD. THE STATION MARK IS AT TOP OF A CUTBANK ON THE EAST SIDE OF THE ROAD, 19 FT (5.8 M) EAST OF THE CENTER OF THE ROAD, 1 FT (0.3 M) WEST OF A METAL WITNESS POST, 6 FT (1.8 M) ABOVE THE ROAD. THE STATION WAS LEVELED TO BY CADT AS A PART OF THE 1995 PERIPHERAL RUN IN SAN DIEGO COUNTY TO ESTABLISH NAVD 1988.

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 May 2000.
  • 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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