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Details for Benchmark: EW7261

N 34° 11.245 W 118° 12.459 (NAD 83)

Altitude: 1889

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

Location:
In LOS ANGELES county, CA View Original Datasheet
Designation:
CERRO NEGRO
Marker Type:
triangulation station disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

Reference Points

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Found while on a 5 mile hike with the Simi Trail Blazers this morning.

[Photos:]
photoEW7261 Station Mark
photoEW7261 Area
photoEW7261 RM 1
photoEW7261 RM 1 Area
photoEW7261 RM 2
photoEW7261 RM 2 Area

I was nearby for a newly published geocache and saw surveyors working. They pointed out this BM and the RMs

[Photos:]
photoBM
photoref mark
photoRM

great views up here

It's been quite some time since I have logged a benchmark. They are pretty tricky to find sometimes. Luckily Webfoot & Craig made it a point today to find this one.

Out for a day of bicycaching the hills with Larry the Pool Guy, MaddMaxx, and Webfoot. Found this benchmark right where we expected it to be. Didn't expect it to be covered with a sugary skull and ants.

veni vidi inveni

CraigsOutside aaaannnd loving it!

After a long bike ride Webfoot and I with the help of Craigsoutside and Mad max found this Benchmark. It is now a shrine for somebody who passed away.

Benchmarks and the two reference points were found very easily today while we rode our mountain bikes along the fire roads. Unfortunately, the benchmark is covered in ooze from what looks like a skull made out of sugar. Ants were all over it. I moved the skull to one of the nearby pedestals so people could see the benchmark. We also rinsed the benchmark off to get a better photo. Coins and other trinkets are all over the benchmark, because it's been turned into a shrine to someone who passed away.

One of the reference points has been pockmarked with BB shot.

[Photos:]
photoCerro Negro benchmark
photoReference Point #1
photoReference Point#2

Need to find this to find geocache!

My first benchmark find.

The benchmark and its two reference marks are easy to find in their obvious concrete pillars. Two gentlemen were using the pillars surrounding the benchmark as seats, but they kindly moved when I explained I wanted to get a look at the disk.
The surface of Cerro Negro BM (N 34 11.247, W 118 12.462) has some pockmarks, but the markings are clearly legible.
The surface of RM1 (N 34 11.242, W 118 12.455) has been defaced, so not all the markings can be read.
The surface of RM2 (N 34 11.246, W 118 12.469) is in decent condition with clearly legible markings.

[Photos:]
photoClose-up of CERRO NEGRO - EW7261 Benchmark
photoLocation of CERRO NEGRO - EW7261 Looking NW
photoClose-up of RM1 - EW7261 Benchmark
photoLocation of RM1 - EW7261 Benchmark Looking NE
photoClose-up of RM2 - EW7261 Benchmark
photoLocation of RM2 - EW7261 Benchmark Looking NW

Out for a run with the Foothills Hash House Harriers. Trail went right near this mark, so I took a few minutes to look. Found the mark right where it was supposed to be. Some erosion of the ground around the mark is observed, but the area is stable. The mark is surrounded by three additional concrete squares with bolts. I suspect the bolts in these concrete squares were either reference points used during the original monumenting of the mark, or may have been used a a base for erecting a tower over the mark during the survey. Also located both RMs. RM1 has been defaced, but enough of the stamping remains that along with location verify that it remains in good condition.

[Photos:]
photoEW7261
Close-up view of the mark.
photoEW7261 Location
Location of the mark.
photoEW7261 Area
View of the area around the location of the mark from near the lookout tower fence.
photoEW7261 Overhead
Overhead view of the area around the mark.
photoEW7261 Overhead Zoom
A zoomed in view of the overhead view. I've never seen a more clear view from overhead assets of a benchmark disk. Notice the other three concrete squares. I love this shot!
photoEW7261 RM 1
N34 11.241 W118 12.448 Close-up view of EW7261 RM 1.
photoEW7261 RM 1 Location
Location of EW7261 RM 1.
photoEW7261 RM 1 Area
The area around the location of RM 1 looking back towards EW7261.
photoEW7261 RM 2
N34 11.245 W118 12.470 Close-up view of EW7261 RM 2.
photoEW7261 RM 2 Location
Location of EW7261 RM 2.
photoEW7261 RM 2 Area
View of the area around the location of RM 2 looking back towards EW7261.

Found this disk while geocaching in the area. The surface of the disk is pockmarked but still legible.

[Photos:]
photoCERRO GORDO EW7261 Disk, Los Angeles County, CA

Quick find while doing the Ultimate Destination cache.

Found all three BM disks.

Another first-timer thanks to the Ultimate Destination Cache.

Found on the way to the Ultimate Destination Cache. As with others, it is my first logged benchmark.

One of the many who found this as part of the Ultimate Destination cache. This was my first benchmark.

I found this today while searching for the Cerro Negro cache. I knew I'd found the right one from the logs that mention how the benchmark has been defaced. Indeed it looks like bb shots. You can clearly read "CERRO NEGRO," though.

Finally getting around to logging this.

This was the first benchmark I've found. Out with Huggeles and Weightlosscoach trying to find the Ultimate Destination Cache. It got too dark to finish today.

Out on a hike with TinkGirl and Huggeles. We did this as waypoint one of the Ultimate Destination Cache.

Easy find. Right on top of the old pylon. The benchmark has been defaced. The wording is barely readable. It appears someone was shooting it with a pellet or BB gun. Kids!!!!

Found it doing the Ultimate Destination Geocache (GCC6C7). Added a picture of the much defaced Reference Point 1. Reference Point 2 and the Station Mark are already pictured below.

[Photos:]
photoLooks like someone has disturbed this mark ...

I found this benchmark as part of the Ultimate Destination Geocache. The view from the site was great!

This was my first benchmark. Found it for use with the 'Ultimate Destination' Cache. Great views from up here today.

Used it for the Ultimate Destination Geocache.

First Benchmark for me, I've seen them before but never gave them much thought?
Thanks
PS. got my picture taken with this benchmark by a nearby spy cam with a recorded warning. "PARK IS CLOSED, YOUR PICTURE HAS BEEN TAKEN, PLEASE LEAVE NOW!" ?

Found it going to Ultimate Destination Cache.
-Frodo'n'Sam

Found as part of Ultimate Destination Geocache.

Found this after finding Cerro Negro cache and getting the info for the Ultimate Destination coordinates.

N 34° 11.246 W 118° 12.461

I've never seen a triangulation disk before, so this was interesting to me.

[last edit: 8/16/2003 9:57:40 PM PST]

[Photos:]
photoTriangulation Station Disk
I have seen many benchmarks, but this is the first time I've seen a triangulation station disk. Pretty impressive. Each concrete block was big enough to sit on.
photoCloseup of bronze disk
Still in pretty good shape for being almost 70 years old.
photoCloseup of GPS coordinates
This picture shows the coordinates on my Garmin Venture.
photoReference Mark 2

Found it while doing the Ultimate Destination Geocache

Found it.

coolbet, Cuba, NY

found it as part of ultimate destination.

Found 2 of the 3 marks while searching for Ultimate Dest. and Cerro Negro caches nearby

We found it as part of ultimate destination.

Found it as part of the Ultimate Destination clue.

Found it for Ultimate Destination cache.

I found this one first while out on the Ultimate Destination Cache. I found it at night with my new LED headlamp. I also found the other benchmark a bit to the west.

Easy find, beautiful views...

N 34° 11.246 W 118° 12.460

Found it as part of the Ultimate Destination Cache, this is our first Benchmark. And we did it with our newly initiated (into the sport) CDN Nomad friends.

I never saw one of these WW2 Siren sites, it was a great trip into history!

This first disk, I got as being 9' lower than the benchmark.

We didn't find the third either.

[last edit: 1/26/2003 7:42:02 PM PST]

Found as described... also found Ref disk #2. Disk #1 eluded me Probably off in the bushes The Glendale K 1 triangulation station benchmark is over by the Bobby Cache
-O M Navstar

N 34° 11.246 W 118° 12.461

Stumbled across this while looking for the Cerro Negro cache. The coordinates from our GPS agreed well with the listed benchmark details.

[last edit: 9/15/2002 8:41:23 PM PST]

[Photos:]
photoEW7261
photoLooking northish

Documented History (by the NGS)

01/01/1965 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1965 (JJL) THE STATION IS LOCATED ABOUT 1-1/2 MILES SOUTHEAST OF MONTROSE, 1 MILE SOUTHWEST OF LA CANADA, ON THE MOST NORTHERLY HILL OF THE SAN RAFAEL HILLS AND ON THE SAME HILL AS THE SAN RAFAEL LOOKOUT TOWER. TO REACH THE STATION FROM THE POST OFFICE IN LA CANADA, GO WESTERLY ON FOOTHILL BOULEVARD (STATE HIGHWAY 118) FOR 0.8 MILE TO CHEVY CHASE DRIVE. TURN LEFT AND GO SOUTHERLY ON CHEVY CHASE DRIVE FOR 1.9 MILES TO INVERNESS DRIVE. TURN RIGHT AND GO WEST ON INVERNESS DRIVE FOR 0.1 MILE TO HAMPSTEAD ROAD. TURN LEFT AND GO SOUTH, WEST AND NORTH ON HAMPSTEAD ROAD FOR 0.5 MILE TO SUGAR LOAF DRIVE. TURN LEFT AND GO WEST ON SUGAR LOAF DRIVE FOR 0.4 MILE TO A LOCKED GATE. (A KEY FOR THE GATE MAY BE OBTAINED AT THE FIRE HOUSE AT THE INTERSECTION OF GEORGIAN STREET AND FOOTHILL BOULEVARD IN LA CANADA.) PASS THROUGH THE GATE AND CONTINUE WEST FOR 0.05 MILE TO A T-INTERSECTION. TURN LEFT AND GO SOUTH FOR 0.05 MILE TO A 3-WAY FORK. TAKE THE LEFT FORK AND GO SOUTH AND WEST FOR 0.1 MILE TO THE TOP OF THE HILL AND THE STATION. THE STATION MARK, STAMPED CERRO NEGRO 1934 RE 62, IS A LOS ANGELES COUNTY SURVEY CONTROL DISK SET IN THE TOP OF A 12-INCH SQUARE CONCRETE MONUMENT THAT PROJECTS 5 INCHES. IT IS 50 FEET NORTHEAST OF THE NORTHEAST LEG OF THE LOOKOUT TOWER, 48.3 FEET NORTHWEST OF A WITNESS POST AND 19 FEET NORTH OF THE CENTER OF THE ROAD. REFERENCE MARK NO. 1, STAMPED CERRO NEGRO LAC NO 1 1965, IS A STANDARD DISK SET IN THE TOP OF A CYLINDRICAL CONCRETE MONUMENT THAT IS 1 FOOT IN DIAMETER AND PROJECTS 3 INCHES. IT IS 24 FEET SOUTHEAST OF THE CENTER OF THE ROAD AND 3.1 FEET NORTHEAST OF THE WITNESS POST. REFERENCE MARK NO. 2, STAMPED CERRO NEGRO LAC NO 2 1965, IS A STANDARD DISK SET IN THE TOP OF A CYLINDRICAL CONCRETE MONUMENT THAT IS 1 FOOT IN DIAMETER AND PROJECTS 4 INCHES. IT IS 85.5 FEET EAST OF THE WITNESS POST, 15 FEET SOUTHWEST OF THE CENTER OF THE ROAD AND 3 FEET SOUTHEAST OF A POWER POLE. IT IS 87.74 FEET OR 26.743 METERS BETWEEN THE REFERENCE MARKS. NO SUITABLE LOCATION FOR AN AZIMUTH MARK.
01/01/1971 by NGS (MONUMENTED)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS) THE STATION WAS RECOVERED, FOUND TO BE AS DESCRIBED IN 1965, AND IN GOOD CONDITION. REFERENCE MARKS 1 AND 2 WERE RECOVERED IN GOOD CONDITION AND AS DESCRIBED. AN EXCELLENT CHECK WAS MADE IN DISTANCE AND DIRECTION TO THE REFERENCE MARKS. THE 1965 ROUTE WAS USED IN RECOVERY OF THE STATION AND FOUND TO BE ENTIRELY ADEQUATE.
01/01/1975 by NGS (MONUMENTED)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1975 (CLN) THE STATION MARK AND REFERENCE MARKS 1 AND 2 WERE RECOVERED IN GOOD CONDITION AND AS DESCRIBED IN 1965 AND 1971. THE 1965 AND 1971 DISTANCES AND DIRECTIONS TO REFERENCE MARKS 1 AND 2 WERE FOUND TO COMPARE FAVORABLY WITH THOSE OBSERVED THIS YEAR. THE 1965 ROUTE TO THE STATION WAS USED IN RECOVERY AND FOUND TO BE ENTIRELY ADEQUATE.
01/01/1978 by CADT (GOOD)
RECOVERY NOTE BY CALTRANS 1978 (RLS) THE STATION MARK AND REFERENCE MARK NO. 1 AND NO. 2 WERE RECOVERED IN GOOD CONDITION AS DESCRIBED BY J. J. LIUM IN 1965.
01/01/1986 by (GOOD)
RECOVERED 1986 RECOVERED IN GOOD CONDITION.

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 NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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