Every time I’ve run the Chamberlain segment of the Backbone Trail, I’ve looked at the intriguing rock formation near the top of the trail and wanted to climb it. Looking a bit like an aircraft carrier that’s run aground on a mountain ridge, it’s one of the most prominent peaks along Boney Mountain’s western escarpment. Named “Boney Bluff” by rock climbers, several sport climbing routes were established on the southeast side of the peak in the early 2000s.
Located just northwest of the junction of the West Tri Peaks Trail and the Backbone Trail, the peak is visible from many points in Pt. Mugu State Park. According to lidar-based 1-meter resolution 3DEP data, its elevation is 2985′, which is slightly higher than the 3DEP elevation of nearby Exchange Peak.
Boney Bluff is one of many small peaks and rock formations that are found across the Boney Mountain plateau. Comprised of a fused mishmash of volcanic breccia, the rock quality of these formations ranges from very good to quite bad. Seemingly solid handholds or footholds can break, and because of the way the rock erodes, low-angle sections are often littered with granular rocks that can be very slippery.
Having climbed the Western Ridge on Boney Mountain, I approached Boney Bluff from the north, via the Tri Peaks Trail. My route climbed a slope to the east side of the peak, then traversed right to the base of a jumbled face with several oddly eroded ledges. A short, steep crack and grassy ramp provided access to the ledges above. NOTE: There may be a better way to climb the peak. I was trying to do a relatively direct route and avoid bushwhacking. The route is somewhat manky, but worked for me.
The high point of the peak is on top of a summit block that caps the “island of the carrier.” Many of the formations on Boney Mountain have summit blocks, and these are often the most difficult part of the climb. Rule #1 involving summit blocks: Don’t climb up anything you can’t 100% for sure climb down! This one looked like it might be tricky, but with careful route-finding was pretty straightforward.
Because Boney Bluff is perched on the edge of the Boney Mountain plateau, on a clear day there are outstanding panoramic views of Pt. Mugu State Park and the Boney Mountain area from its summit. Today, the visibility was excellent and Mt. Baldy was visible, 75 miles to the east.
Lidar-based 3DEP Elevation Estimates of Some Boney Mountain Peaks
The resolution of the 3DEP Elevation Data is very impressive. While checking the elevation of Boney Bluff, I also noted the 3DEP elevation of several other peaks in the Boney Mountain area. For more info about 3DEP see this U.S.G.S. website.
Sandstone Peak 3116′
Tri Peaks 3039′
Boney Bluff 2985′
Boney Crest 2974′ (Accessed via Western Ridge or Cabin Trail)
Halloween’s full Moon is the second full Moon of the month, giving it the distinction of being a “Blue Moon.” The next Blue Moon won’t occur until Aug 31, 2023.
The title photo of the setting Moon was taken a few minutes before sunrise on Halloween, from Fire Road 30 & dirt Mulholland, in the Santa Monica Mountains.
I was doing an out and back trail run from the “Top of Reseda” to somewhere on Rogers Road segment of the Backbone Trail. With about three hours and one bottle of water available, “somewhere” turned out to be the Lone Oak above Will Rogers State Park.
Including short side trips to Cathedral Rocks and Temescal Peak, the roundtrip totaled about 14.5 miles of enjoyable trail running.
Above are thumbnails of a few photos from a 20-mile out and back trail run to Mugu Peak from the Wendy Drive Trailhead. The run was on October 17, 2020. Click on an image for a larger photo and more information.
There are several ways to get to Mugu Peak from the Wendy Drive Trailhead on Potrero Road. When I do this run I’m usually looking to do a longer, faster-paced run without a huge amount of elevation gain. That translates to running down Big Sycamore Canyon to Wood Ranch Road and then either running up the Backbone Trail or Hell Hill to the “hub,” and from there to La Jolla Valley and Mugu Peak.
The Chumash-Las Llajas Loop is a scenic 9.3 mile trail run in the eastern Simi Valley. Run counterclockwise, it combines a strenuous climb on a single-track trail and fire road with a fast-paced 4-mile downhill on a dirt road. The cumulative elevation gain/loss on the loop is about 1600′.
I like to do the loop starting at the Las Llajas Canyon trailhead on Evening Sky Drive. A short jog up Evening Sky Dr., then across a field, and you’re on your way up the Chumash Trail. From this point, it’s an approximately 1000′ climb over 2.7 miles of rocky trail to Rocky Peak fire road.
After turning left (north) on Rocky Peak fire road, a short downhill is followed by three-quarters of a mile of climbing to “Fossil Point.” A short detour off the main fire road leads to a cairn marking the high point. From here there is a panoramic view of Oat Mountain, San Fernando Valley, San Gabriel Mountains, Santa Monica Mountains, Simi Valley, Boney Mountain, Channel Islands, and Ventura Mountains.
Exposures of fossil shells are found near the high point. According to the area’s Dibblee geology map, these may have been deposited in shallow marine lagoons a couple million years ago.
From the high point, the loop continues north on Rocky Peak Road. At first, it descends steeply, then climbs to a hilltop with a few valley oaks. Partway up the hill, a roadcut reveals the long roots of the chamise plants on the hillside.
Some of the wildlife, and not-so-wild animals, I’ve encountered on the loop include rattlesnakes and other snakes, deer, longhorn cattle, roadrunners, and a kangaroo rat. Although others have seen mountain lions in the area, I’ve only photographed their tracks.
The loop ends with a short, steep climb up a paved road. At the top of the hill, turn left to return to the trailhead.
Explore the scenery and terrain on the Chumash-Las Llajas Loop trail run using our high resolution, interactive, 3D viewer. The imagery is so detailed, it’s almost like being there! To change the view, use the control on the upper right side of the screen, the CTRL key and your mouse, or touch gestures. Track and placename locations are approximate and subject to errors. Poor weather, and other conditions may make this route unsuitable for this activity. (It is also possible to start the loop at the Chumash Trail trailhead at the end of Flanagan Dr.)
The title photo is a section of Rocky Peak fire road between the top of the Chumash Trail and Fossil Point. It is from a run on October 6, 2020.