Category Archives: malibu creek state park

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Trying to Use AI to Solve a Malibu Creek State Park Plant Mystery

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Terminal leaf cluster of Purple Clarkia (Clarkia purpurea), after it has flowered.

Recently, while doing the Bulldog Loop in Malibu Creek State Park, I noticed a peculiar plant about a half-mile up the Bulldog climb. The linear, red-tinged “petals” were unusual in the early morning light. I snapped a photo of it, planning to identify it later.

When I looked at the photo later that day, I couldn’t ID the plant. Hoping to get some hint about its identity, I tried various “AI-powered” searches and apps. This included Google Lens, Bing Visual Search, Pl@ntNet, iNaturalist Seek, PlantSnap, Flora Incognita, LeafSnap, and others. The most common matches were air plants such as Tillandsia ionantha and various species of paintbrush.

This wasn’t a huge surprise. The AI-based applications were having the same problems I was having — they were not “familiar” with this particular stage of the plant’s life cycle. They also were not keying on an important element of the image.

After a few days without any progress identifying the plant, I headed back to Malibu Creek State Park to take a closer look at the plant.

That turned out to be more challenging than expected. Even though I had the plant’s GPS coordinates, the time of day was different, with different lighting. The plant was also less colorful than before. I walked up and down a 30-yard stretch of Bulldog fire road several times before finally seeing it.

Once located, it didn’t take long to find examples of the plant at an earlier stage of development. In one case, with leaves on the stem and another with leaves and a flower. This helped solve the mystery.

It turned out the plant was one with which I was familiar — Purple Clarkia (Clarkia purpurea). The title photo is after the plant has flowered and all but a terminal cluster of leaves on the stem have wilted. The 8-grooved, elongated-football-shaped structures intermixed with the leaves are ovaries. These are distinctive. A human expert would have immediately zeroed in on these.

The flowers of Purple Clarkia are usually much larger than seen here. They are typically purple-pink with a wine-red spot on each of the four petals. However, the color of the flowers varies, and wine-colored flowers are not uncommon. The size of the flower also varies. Jepson mentions that the subspecies intergrade extensively.

Using the photo of the plant in flower, some of the AI-based apps identified the genus as Clarkia and/or the species as purpurea, or at least included Clarkia among their suggestions.

adventures, malibu creek state park, nature, nature|wildflowers, photography, photography|landscape, running, trails

Afternoon Run on the Forest and Lost Cabin Trails in Malibu Creek State Park

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Creek monkeyflower along the Lost Cabin Trail.
Creek monkeyflower along the Lost Cabin Trail.

The seasonal bridge across Malibu Creek is back! No sketchy log to test your balance or thigh-deep water to wade through — just walk across.

This afternoon I’d returned to Malibu Creek State Park to check on the bridge, count the surviving coast redwoods on the Forest Trail, and see what was happening on the Lost Cabin Trail.

When running the Bulldog Loop a couple of weeks ago, I did a quick check of some of the redwoods on the Forest Trail but skipped the back half of the trail. Today, I crawled through the downed trees blocking the trail and checked the rest of the trees.

I counted seven surviving redwoods. Several of these are  multi-tree groups consisting of two or more trees. These family groups  were counted as one tree. One of the trees, and perhaps more, was naturally germinated. Most of the trees looked healthy, but appearances can be deceiving.

Coast redwood on the Crags Road Trail on the way to the M*A*S*H site in Malibu Creek State Park
Coast redwood along the Crags Road Trail

One redwood is just a few feet from the Crags Road Trail. It’s on the right side of the trail, just past the seasonal bridge, when going west on Crags Road toward the M*A*S*H site. The unique conifer is easy to spot among the other trees.

The start of the Lost Cabin Trail is on the left as you enter the M*A*S*H site going west on Crags Road. Like the Forest Trail, it is less used and isolated but has a character all its own. Today, the Lost Cabin Trail was a trove of brightly colored wildflowers.

Here are a few photos taken along the way.

Some relate posts: Wonderful Wildflowers, a Seasonal Bridge, and a Cranky Rattlesnake on the Bulldog Loop; Lost Cabin; More Malibu Creek Flooding

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Wonderful Wildflowers, a Seasonal Bridge, and a Cranky Rattlesnake on the Bulldog Loop

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Canyon sunflowers covering a hillside in Malibu Creek State Park that was burned in the 2018 Woolsey Fire
Canyon sunflowers covering a hillside burned in the 2018 Woolsey Fire

Update May 5, 2023. Did a run this afternoon in Malibu Creek State Park and the seasonal bridge across Malibu Creek on the Crags Road Trail is back in place!

As I approached the M*A*S*H site, I could see some people taking photos. I stopped to say hi, and without skipping a beat, one of them asked, “Did you wade across the creek?”

He was asking about the creek crossing where Crags Road crosses Malibu Creek upstream of Century Lake and east of the M*A*S*H site.

Prickly phlox along the Tapia Spur Trail in Malibu Creek State Park
Prickly phlox along the Tapia Spur Trail.

There’s a substantial log spanning the creek at the moment, and I wanted to answer that I danced across it with my eyes closed. But instead, I explained that I decided to wade — and for sure keep my phone dry — rather than take a chance of falling uncontrolled into three feet of water, ker-splash.

Speaking of which, this morning, I talked to a mountain biker who saw the bridge pulled off to the side of the creek before any flooding had occurred and thought it may have been hauled away. Good news! According to the Malibu Creek Docents, the bridge is seasonal and was designed to be portable. It was removed and stored before this Winter’s rain. It is expected to be reinstalled when the threat of flooding is over — which should be soon.

Vinca growing at the base of a coast redwood in Malibu Creek State Park
Vinca growing at the base of a coast redwood along the Forest Trail.

After crossing Malibu Creek and before continuing to the M*A*S*H site, I took a quick detour on the Forest Trail. Bordered by Century Lake on one side, and steep, rocky slopes on the other, the Forest Trail has a character all its own. It’s a wonderful place to observe, reflect, and enjoy nature. It’s also home to several coast redwoods. Unfortunately, less than half the trees originally growing along the trail survived the 2011-2015 drought. This morning, a redwood that died several years ago had fallen and was partially blocking the trail near its halfway point.

As has been the case in most of Southern California this Spring, the wildflowers on this run were spectacular. Canyon sunflower was particularly prevalent, with many thousands of the bright-yellow blossoms covering the hillsides burned in the 2018 Woolsey Fire.

Very dark Southern Pacific Rattlesnake on a fire road in Malibu Creek State Park
Southern Pacific Rattlesnake on Castro Peak Mtwy fire road.

Also exciting was my first rattlesnake encounter of 2023. I was running down Castro Peak Mtwy Fire Road from the Bulldog “T” when I saw something in the road that looked like a partially exposed root. As I neared, I could see it was a very dark — almost black — Southern Pacific Rattlesnake.

The snake was stretched out straight on the road, basking in the sun. As I approached, it did move, and it did not rattle. Usually, snakes in this state are pretty docile, and I can cautiously walk a few feet behind them. Yikes! This one was super-aggressive. In the blink of an eye, it turned and moved toward me, doubling back on itself. I jumped a mile! It coiled but still did not rattle! It must have recently emerged from its Winter hideaway.

Here are a few photos (primarily wildflowers) taken on the Bulldog Loop.

Some related posts: More Malibu Creek Flooding; Bulldog Training Run; After the Woolsey Fire: Malibu Creek State Park Redwoods, M*A*S*H Site and Bulldog Climb

Also check out the M*A*S*H site web page.

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More Malibu Creek Flooding (January 2023)

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Malibu Creek near M*A*S*H site following January 2023 flooding
Malibu Creek near M*A*S*H site

April 26, 2023 Update. As it turns out, the shiny, new bridge on the Crags Road Trail that made it easy to cross Malibu Creek was not washed away! According to the Malibu Creek Docents, the bridge was designed to be portable, and was removed and stored before this Winter’s rain. It is expected to be reinstalled when the threat of flooding is over — which should be soon.

I was just a couple of miles into an extended version of the Bulldog Loop. The temperature was in the mid-30s, and once again, I was having to cross Malibu Creek on a makeshift bridge of wobbly limbs and debris.

Flood debris on the Crags Road Trail January 2023
Flood debris on the Crags Road Trail

The flood was the result of a series of three increasingly wet storms between December 30 and January 10. During that period, the Malibu Canyon RAWS recorded about 13 inches of rain. In the last storm of the series, 6 inches of rain was recorded in about 33 hours.

The flooding along the Crags Road Trail from the Forest Trail junction to the M*A*S*H site was similar to the February 2017 and December 2021 events. In the January 2023 event, more debris was deposited on the trail, and sections of the trail were obliterated. That stretch of trail is popular, and a new use trail is already taking shape.

Rainfall and runoff were even higher in Santa Barbara and Ventura Counties. The Rose Valley RAWS recorded over 22 inches of rain for the three storms. According to preliminary streamflow data, the Ventura River Near Ventura reached a new record stage height of 25.42 feet on January 9. The Sespe Creek Near Fillmore gage malfunctioned at the peak flow but reached at least 20.38 feet.

Some relate posts: Malibu Creek December 2021 Floods, Malibu Creek Flooding, Southern California Creeking

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Bulldog Training Run 2022

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Runners east of Corral Canyon on the Bulldog Loop

When I parked at Malibu & Piuma to do the Bulldog Loop on Sunday, I didn’t know that I was going to be swept up in a Bulldog Ultra training run.

I had just started up Bulldog Mtwy fire road when the first group of speedy runners swarmed past. The strenuous climb to the Castro Peak Mtwy gains about 1750 feet over 3.4 miles. Much of its infamy is due to the oven-like conditions typically experienced on the second loop during the Bulldog 50K.

New bridge extension across Malibu Creek on the Crags Road trail, east of the M*A*S*H site.
New bridge extension across Malibu Creek on the Crags Road trail, east of the M*A*S*H site.

This morning, the climb was a little warm in spots, but not bad. There was a good turnout for the training run and nearly everyone was enjoying the run.

On the way up I had an interesting conversation with a runner that had just done their first 100 miler and was going to pace someone in the AC100 this weekend.

In case you haven’t heard, State Parks has finally come up with a solution to the repeatedly washed-out footbridge across Malibu Creek, east of the M*A*S*H site. An extension was added to the massive block of concrete that formed the foundation of the old bridge. No more shaky log crossings — at least for a while.

Common Madia (Madia elegans) at the bottom of the Bulldog Mtwy fire road.
Common Madia (Madia elegans) at the bottom of the Bulldog Mtwy fire road.

Here’s an interactive, 3D terrain view of the Bulldog loop. The map can be zoomed, tilted, rotated, and panned. To change the view, use the control on the upper right side of the screen. Track and placename locations are approximate and subject to errors. Poor weather and other conditions may make this route unsuitable for this activity.

Good luck to all the runners doing Bulldog — especially those doing their first trail race or ultra!

Some related posts: Sunlit Rocks Along Castro Peak Motorway; Trees, Bees, and a Washed-Out Footbridge on the Bulldog Loop in Malibu Creek State Park; Bulldog Loop Plus the Phantom Loop; After the Woolsey Fire: Bulldog Loop

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Forest Run

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Coast redwood along the Forest Trail in Malibu Creek State Park

The nasal bellowing of a bullfrog shook the morning, but didn’t disturb the mirror-like surface of Century Lake. I had paused along the Forest Trail in Malibu Creek State Park to take in my surroundings. Here and there glimmers of sunlight reflected from the base of the reeds along the opposite shore. Birds called, flowers bloomed and Nature continued to work in its wonderous way.

Canyon sunflower along the Lookout Trail in Malibu Creek State Park.
Canyon sunflower along the Lookout Trail.

My run had started at the Cistern Trailhead on Mulholland Highway and then wandered about the Reagan Ranch area. The Lookout and Yearling Trails had been thick with mustard and badly overgrown. The plants had been wet with dew, and my black sleeves and shorts had been liberally sprinkled with the bright yellow flowers. A few ticks had also hitched a ride, but were removed before they could bite.

It had been a relief to get back to the Cage Creek Trail and descend to the Crags Road Trail and Malibu Creek. The logs extending across the creek from the washed out bridge had been rearranged, making it easier to cross.

Log crossing across Malibu Creek on the Crags Road Trail, near the Forest Trail junction.
Log crossing across Malibu Creek on the Crags Road Trail, near the Forest Trail junction.

No other trail in the Park is quite like the Forest Trail. The trail isn’t part of a loop, doesn’t connect to other trails, and is only a half-mile long; but it feels like a trail you might find in Big Sur, Santa Cruz or the Bay Area. The forest is comprised primarily of coast live oak, California bay, and sycamore, but at several spots along the trail you’ll find coast redwoods.

Coast redwoods are not endemic to Southern California. All but one of the Forest Trail redwoods were planted over 100 years ago. The trees were severely impacted by the 2011-2015 drought, and only a few have survived. Even so, they are easy to spot — the large, deeply-furrowed, copper-brown trunk of a coast redwood is unmistakable.

Note: There is some poison oak along the Forest Trail, and this year some was protruding onto the trail.

Some related posts: The Malibu Creek State Park Redwoods Are Dying; Malibu Creek State Park Redwoods: Fighting the Drought; After the Woolsey Fire: Malibu Creek State Park Redwoods, M*A*S*H Site and Bulldog Climb