Cobblestone mountain from Ant Camp

TRs for Los Padres National Forest.
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dima
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Post by dima »

So I'm trying to get to Cobblestone mountain. The usual approach from Sewart peak isn't an option because of the Post fire. I tried to approach from the West, but that route is laughably rough and un-bikeable. That leaves the approach from the South as the only remaining route that I've heard of: David Stillman's "Redrum Ridge". Go read his report; it's great. I should mention I haven't heard of anyone else ever going that way.

I drove to Fillmore and up the hill as far as I could. The road is gated 2.5 miles below Dough Flat, at the Tar Creek crossing. Unclear why it's closed: the water in Tar Creek is low-enough to drive across easily, and the road is in fine shape too. I started walking from this gate at 7:30am. Available daylight was the main concern, so I walked quickly. Made it to Dough Flat and beyond in good time. The trail here gets some use, and is in good shape. Eventually I got to the junction:

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I'm going down to Ant Camp. At this junction the conditions deteriorate to the abandonment we expect in the Los Padres. Past the junction the trail looks like this:

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A nice view of today's project opens up from the top of the descent to Ant Camp:

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Ant camp is in the Agua Blanca canyon hidden in the center of the image. The route follows the ridgeline from the center to the top-right (NE), and then turns left (N and then NW) to follow the ridge to Cobblestone mountain, the big peak in the image. The brush looks alarming.

The drop down to Ant Camp hasn't been maintained in a very long time. It's overgrown, and could use some love. What's left of Ant Camp:

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There's also an old metal sign, faded to complete illegibility.

Agua Blanca is flowing well. It was a cool day, so I filled up 3L here. I climbed the slope straight up from the camp

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It's steep, but there's plenty to hold on to, and it's not technical. I went straight through the boulders in the center of the image, which had maybe class-3 moves, but plenty of easier lines are available. At the top of the initial climb, better views open up

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The climb coming up looks like this:

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Brushy. However, the bears like it here: there's bear scat absolutely everywhere on this ridge. So in many places, there are bear-sized gaps in the brush. And there isn't very much yucca or whitethorn, so you're not constantly getting stabbed. In this part of the climb, getting through the brush wasn't too terrible. At ~4500ft the gaps closed up, and it became more of a struggle. However, there are pine trees to the left of the ridge here. There's no brush there, and that's where the bears go. Once I figured that out, I stayed to the left of the ridge-top in the trees, following the bear trails. It's annoyingly steep, but far better than having to battle the brush. Soon enough I was on point 5235. I was doing fine on water, but the brush slowed me down a lot, and I was now concerned about daylight. It was 12:00. I really REALLY wanted to be back to at least Ant camp before sundown. Which meant that I should be at the peak at 13:15; 13:30 at the latest. I haven't even started what Stillman called "3 Evils" yet, so success was doubtful. In any case, at 5235 I had a preview of the "first Evil":

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As before, it's steep, a bit brushy, and not technical. Honestly, not a big deal. After a few steep sections you get to the final set of bumps. These are straightforward also:

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The bump in this last photo is the peak. Summitted at 13:23. Finally!

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This is a very fancy register. The bolt holding the wing nut in place is quite rusted, and it's very hard to turn by hand. I had a multitool with pliers, which helped immensely at opening this thing. Somebody should bring some lubricant, or something. Inside the box are some old register books

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I needed to start heading back ASAP unfortunately, so I spent only 10 minutes at the summit, and didn't read the old entries at all. The views from up here are grand. Santa Clarita and the evils and (the bumps in the middle; in order) Strawberry, Lawlor, Josephine, San Gabriel, Markham, Lowe, Lukens.

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Point 5235 and the brushy ascent ridge and Hopper and Whitacre:

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Sulfur, San Cayetano, Santa Paula and some barges near Port Hueneme:

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North, towards Snowy and Frazier:

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And Alamo:

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And the wind farm and the Tehachapis:

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And Hines, upper Agua Blanca Canyon and Reyes:

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Eventually I scurried back down the hill. One of the bumps next to the summit has some sort of (probably?) oil thing:

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This is the only human anything between the summit and Ant Camp.

The geology of this area is very cool. There's lots and lots of cool conglomerate rock, with big boulders, which I'm guessing is why Cobblestone mountain has that name

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The backside of Whitacre peak has cool, slabby geology

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And even around Ant Camp there are cool-looking strata:

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I made it back to Ant Camp in good time. The sun set just as I was finishing the climb out, and I did the final trail, road walk in the dark. Final stats, as reported by my phone: 9000ft gain, 24 miles, 12 hours.

David Stillman was so impressed by the challenges of this route, he called it "Redrum Ridge" and the final sections of the climb "The 3 Evils". This was clearly very long, but it didn't feel especially hard, and I'm not sure the notoriety is deserved. The brush was manageable; route-finding was easy; it's entirely non-technical. I'd say this is in the same difficulty ballpark as the non-trail, non-North ridges of Iron Mountain. Triplet rocks and (probably) Iron Mountain North ridge are a whole other type of thing. This is a cool, remote area. Recommended!
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Sean
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Post by Sean »

Thanks for the report. How is it 9000 gain?
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dima
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Post by dima »

Sean wrote: Fri Dec 27, 2024 11:19 am How is it 9000 gain?
Great question. The net gain is more like 4500ft, but there's a LOT of up/down. The "true" number is mostly unknowable. Strava thinks it's 8k, and maybe that's correct. Who knows.
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Nate U
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Post by Nate U »

Nice bag!

Cobblestone Mountain is prominent from countless hikes I've been on around the Santa Clarita valley. Didn't realize it was such a challenge to summit. And yes, the geology of most of the mountain is completely different from the San Gabriels, being Eocene marine sedimentary rocks.
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Matthew
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Post by Matthew »

What a great report! That peak looks like quite the athletic adventure so I will have to try that route when my fitness hits a peak
stoke is high
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Nate U
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Post by Nate U »

dima wrote: Fri Dec 27, 2024 11:22 am Great question. The net gain is more like 4500ft, but there's a LOT of up/down. The "true" number is mostly unknowable. Strava thinks it's 8k, and maybe that's correct. Who knows.
Gain calculations are a dark and speculative art, no matter the method used.
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Sean
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Post by Sean »

When I was creating tracks I'd always smooth them manually point by point, to get the most accurate stats.
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dima
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Post by dima »

Here's the caltopo link from my route planning, with the extra road walk added. If I ask caltopo for the profile, it says 6142' gain, 1836' loss. This comes from sampling the elevation maps, so I would expect this to be a slight underestimate of the true effort (because in reality I didn't follow this mostly-perfect line). I did a there/back along this route, so my gain would be 6142+1836 = 7978ft. Let's call this an even 8k.
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tekewin
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Post by tekewin »

Amazing feat! I didn't think anyone else would ever attempt that ridge. It's hard enough from the regular trailhead (when it's open). The cool weather helps, but you used less than half the water Stillman did. Wow.

My main complaint about Los Padres is how often the roads are closed and how long they stay closed. I've been trying to get to Lizard Head and Big Pine for over 18 months. Roads may open in the spring of 2025, but no guarantees. Depends on how the winter goes.

For the last few years, I've been used GPS visualizer https://www.gpsvisualizer.com/ to calculate gain.
Go to Profiles, then:
Add DEM elevation data: best available
Track/Line options: show advanced options
Calculate elevation gain: Yes
Elev. gain threshold: 4m
Trackpoint distance threshold: 4m

That smooths out a lot of jitter, and takes the subjective part out, but it's still just an estimate.
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Uncle Rico
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Post by Uncle Rico »

Yuuuuge!

Christopher Lord did a variation on this route back in May of 2020, although he didn't do it in one day and didn't actually summit Cobblestone.

At Ant Camp (which Chris restored), instead of grinding up the ridge you ascended, he followed the old abandoned trail (19W10) up the Agua Blanca drainage to Saddle Skirt, Borracho Spring, and then Borracho Camp. From there, he went up the western drainage coming off Cobblestone to the saddle. He exited at Ellis Apiary via 18W03 just north of Lake Piru.

TR with a KLM and GPX track here: https://christopherplord.blogspot.com/s ... obblestone
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dima
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Post by dima »

Wow. That big loop around the mountain looks excellent. I wouldn't mind checking out the East ridge of Cobblestone at some point. The abandonment of the LPNF really is impressive.
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