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Triangular peak markers in the San Gabriels
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dima



Joined: 12 Feb 2014
Posts: 170


Location: Los Angeles

PostPosted: Mon Oct 05, 2015 2:32 pm    Post subject: Triangular peak markers in the San Gabriels  Reply with quote

Some peaks in the San Gabriels have metal signs on them with some sort of code written on an inverted triangle, like this W15 on top of Iron Mountain:



There's a W5 on top of Lookout Mountain, and I've seen a number of others I can't recall right now. Does anybody know what those signify? Is there a list?
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Sean
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Joined: 27 Jul 2011
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Location: Monterey Park, CA

PostPosted: Mon Oct 05, 2015 2:57 pm    Post subject: Reply with quote

They are witness posts. They are used to locate benchmarks. Witness posts come in different shapes and sizes. It appears the two you mentioned were used by survey teams in the '20s and '30s.
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dima



Joined: 12 Feb 2014
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PostPosted: Mon Oct 05, 2015 4:43 pm    Post subject: Reply with quote

Sean wrote:
They are witness posts. They are used to locate benchmarks


Oh that's interesting. So they live next to the USGS markers in the ground? I feel like I've seen at least one markerless one before: Iron Mt south ridge, off to the side of the trail. Wonder what that one was for, then. Will try to find it again next time I'm up there.
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Sean
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PostPosted: Mon Oct 05, 2015 7:03 pm    Post subject: Reply with quote

Well sometimes the marks are long gone or buried, so don't kill yourself looking for them.
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dima



Joined: 12 Feb 2014
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PostPosted: Sun Jun 12, 2016 12:13 pm    Post subject: Reply with quote

So I found another of these yesterday, and now I want to have a full list. The ones I know of:

- W1: junction of the ridge North of Lookout mountain and the one carrying Bear Canyon Trail to Baldy
- W5: Lookout Mt
- W15: top of Iron Mt
- 26: Burro Peak (or so says Sean)
- 6: Sunset Peak (or so says tekewin)
- [blank]: top of ridge near the Pallett Benchmark
- [blank]: somewhere on Iron's South ridge, just West of the trail. I didn't make a note of exactly where I found it.
- G2B: above Adams Falls

I'm pretty sure I saw one on the firebreak below Clamshell Peak, but it was a while back. What others do people know of?
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Uncle Rico



Joined: 20 Mar 2008
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Location: Pleasantville

PostPosted: Sun Jun 12, 2016 4:44 pm    Post subject: Reply with quote

Quote:
I'm pretty sure I saw one on the firebreak below Clamshell Peak, but it was a while back. What others do people know of?


There's one on the south edge of the summit of Iron #3.

Wow. Don't know why that image is so big. Sorry.
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Sean
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PostPosted: Mon Jun 13, 2016 9:16 am    Post subject: Reply with quote

The ones with numbers on them interest me the most. There are probably many dozens without numbers, mostly found on old firebreaks. I'm not sure if they were witness posts for benchmarks or not.
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JeffH



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PostPosted: Mon Jun 13, 2016 1:56 pm    Post subject: Reply with quote

Marker V 12 on top of Stoddard Peak. This was in Dec 2014 so I don't know if it's still there.



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HikeUp
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PostPosted: Mon Jun 13, 2016 10:34 pm    Post subject: Reply with quote

There is one on the "typical" route to Rattlesnake...I think at the 4080'+ point.

Huge photo bomb (mine's bigger than yours Rico Smile )...

12 Metal posts at bump ~4100' by HikeUp_Pasadena, on Flickr
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Sean
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PostPosted: Tue Jun 14, 2016 8:42 am    Post subject: Reply with quote

I have documented at least 24 witness posts with triangular plates throughout the Gabes.
I'll list them in two groups by Tom Harrison map.
For the more obscure ones I won't give exact locations on the forum.
If you want pics or more precise location info, message me privately.

Front Country

Blank, near Brown Mtn
Probably blank, near Mt. Lukens
Blank, near Mt. Muir
Blank, near Yale Peak
Blank, near Mt. Emma
Blank, near Roundtop

High Country

Blank, near Clamshell Peak
Probably blank, Etiwanda Peak
45, near Rattlesnake Peak
39, Rattlesnake Peak
W15, Iron Mountain
2-?, Winston Ridge
W 5, Lookout Mountain
FBH1 F21, Circle Mountain
Blank, near Ralston Peak
Blank, Ralston Peak
26, Burro Peak
Blank with graffiti, Chalk Peak
Blank, Lower PVR
Blank, Upper PVR
6, Sunset Peak
V 12, Stoddard Peak
Blank, near Bare Mountain
Another blank, near Bare Mountain
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Sean
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PostPosted: Tue Jun 14, 2016 11:43 am    Post subject: Reply with quote

One more thing about these metal posts: perhaps the triangular plate is intended to associate them with triangulation survey stations. Some of these stations were permanent, like the one on Lookout. While others may have been temporary, like those along firebreaks with apparently no history of a benchmark in the vicinity. That's just a guess though.
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dima



Joined: 12 Feb 2014
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Location: Los Angeles

PostPosted: Tue Jun 14, 2016 9:27 pm    Post subject: Reply with quote

That is a great list, Sean! I don't see any obvious pattern in the codes, but it looks like the 3 known Ws are all in the same rough area. How do you feel about visiting Bighorn Ridge? :)
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Sean
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PostPosted: Wed Jun 15, 2016 8:06 am    Post subject: Reply with quote

dima wrote:
How do you feel about visiting Bighorn Ridge? Smile


I wouldn't go up it looking for posts. While the old Highline Trail crossed the lower part of the ridge, I can't find evidence of a trail or firebreak going up it. Nor can I find a history of any benchmark along the ridge.

Still, I'm looking at Big Horn for other reasons. Email me.
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Sean
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PostPosted: Wed Jun 15, 2016 3:44 pm    Post subject: Reply with quote

Found one more from a pic I took on Throop in Sep. 2011. Something happened to the letters, but it looks like maybe W 28.




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David R



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PostPosted: Thu Jun 16, 2016 3:57 pm    Post subject: Reply with quote

On Bighorn Ridge there is a post, see below from the Ze write-up from 2009.

There is an old bent sign labeled "W12" at Pt. 6388, presumably a relic from the days when a trail ran up the ridge.

http://sangabrielmnts.myfreeforum.org/sutra14354.php#14354

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