Low in the afternoon sky, the Winter sun highlights new green grass on the hills of Ahmanson Ranch following the Woolsey Fire.
Related post: After the Woolsey Fire: Ahmanson Ranchby
Note: The open space area formerly known as Ahmanson Ranch is now Upper Las Virgenes Open Space Preserve. Most locals simply refer to the area as “Ahmanson.”
Running along the winding course of East Las Virgenes Canyon I was both disheartened and encouraged by what I saw. Bleak, blackened slopes extended to the west and southwest as far as the eye could see. But along the canyon there were hopeful signs.
The soil burn severity in the Ahmanson Ranch grasslands had generally been low. Scattered across the landscape were small shrubs and other insubstantial plants that had not burned. Some oaks still had green leaves and almost none had gray, ash-colored trunks from being severely burned. Very few trees had become fully involved. Most of the mature trees looked like they would survive.
Even so, there were a number of casualties. Most of these were oaks weakened by drought and heart-rot. The rotten punk wood in the interior of the base of the tree can be ignited through an exterior weakness or indirectly by the heat of the fire. At some point the trunk of the tree is sufficiently weakened that the tree breaks in the wind or collapses.
Preceding the Woolsey Fire, several drought-stressed oaks in the Ahmanson Ranch area collapsed from heart-rot. That is one of the major differences between the impacts of the 2005 Topanga Fire and the Woolsey Fire — the oaks in the Woolsey Fire were drought-stressed, and as a result of increased heart-rot, more susceptible to basal fire. Winds were also stronger in the Ahmanson area during the Woolsey Fire, which may have contributed to the number of downed trees.
Out to check on some special oaks, I breathed a sigh of relief when I rounded a corner and saw the tree was still standing. A one-of-a-kind tree in the area, the 100+ year-old blue oak was singed, but had survived. On a later run, new green leaves could be seen sprouting among its brown leaves.
After checking the blue oak, I headed up to Lasky Mesa to check on a picturesque oak that has “starred” in photo shoots, TV commercials and other productions. This once-flourishing oak has been struggling with the drought and I had my doubts it had escaped the fire. But it did! Although it didn’t appear to be damaged by the fire, it continues to be in very poor condition. Maybe this Winter’s rain will help. It has sprouted a few new leaves, so we’ll see!
The fire was astonishingly efficient at cleaning up dead trees. In some places oaks killed by the drought or the 2005 Topanga Fire were completely consumed by the fire while twiggy, dry shrubs inches away survived.
One area of the Woolsey Fire that burned with higher intensity was near the Las Virgenes Canyon Road trailhead. A large, sprawling valley oak that had survived the 2005 Topanga Fire (and other fires) didn’t make it through the Woolsey Fire. Like most of the valley oaks killed in the fire, it had heart-rot and failed structurally.
Following the fire, I have seen a usual assortment of wildlife in the Ahmanson Ranch area — coyote, rabbit, acorn woodpecker, towee, white-tailed kite, scrub jay, northern harrier, red tailed hawk, raven, quail, and other wildlife. A couple of sightings were unexpected. One was a small, live, Southern Pacific rattlesnake near a firebreak. The other I saw while running on the north side of Lasky Mesa on a drab, overcast day.
I thought I saw a flash of blue against the deep black of the burned slopes, as the bird flittered from tree to tree. I didn’t recognize it. It was the wrong size and shape for a scrub jay, and didn’t fit the coloration or characteristics of other birds I’d seen on Lasky Mesa.
When I got home, I checked the photo, enlarging it as much as I could. It turned out to be a western bluebird! That made me smile!
Here are a few photos taken along the way.by
Today, Ann, Skye and I did a variation of the Bulldog Loop that starts/ends at the Cistern Trailhead on Mulholland Highway and which covers a large portion of Malibu Creek State Park.
The Woolsey and Hill Fires Watershed Emergency Response Team Final Report and Appendix F includes in-depth information concerning these fires, including detailed Values-at-Risk assessments. (These are large PDF files.)
The soil burn severity map included in that report shows that Malibu Creek State Park was one of the most severely burned areas in the Woolsey Fire. This was clearly evident as we ran/hiked along Bulldog Mtwy, Castro Peak Mtwy and Mesa Peak Mtwy. Here is a Google Earth image of the WERT Soil Burn Severity Map with a GPS track of our run added.
As mentioned in last week’s post, there had been some flooding and small debris flows along Crags Road near the M*A*S*H site and at the bottom of Bulldog Mtwy. This week we noted some rockfall along a stretch of Mesa Peak Mtwy that is prone to rockfall. Hazards existed before the fire and hazards exist after the fire.
Bulldog Mtwy and Castro Peak Mtwy had been recently graded and were in decent shape — at least as of December 29. Heavy rain may have changed that assessment.
As badly burned as the park is, there were some things to see on the plus side. The area’s vegetation was taking its first steps toward recovery, with grasses and other annuals, laurel sumac and wild cucumber sprouting. Most of the chaparral along the Mesa Peak Mtwy segment of the Backbone Trail between the picnic table at Puerco Mtwy and Tapia Park was left intact. Most of the Tapia Spur Trail was just outside the fire’s perimeter.
It was was also heartening to see that most of the large oaks along Crags Road, west of the parking lot, were OK. Many of the oaks, sycamores, willows and other trees along Crags Road were scorched, but looked like they will recover.
Here are a few photos taken along the way.by
Many of the live oaks and valley oaks in the Woolsey Fire burn area have withered, brown, scorched leaves. As bad as they look, most of these trees will replace their foliage and recover.
Today I was excited to see foliage replacement occurring on several live oaks in the northeastern area of the fire. This also happened about a month after the 2005 Topanga Fire.
Back in 2005, valley oaks also started replacing their leaves about the same time as the live oaks. That might not happen this time. Valley oaks are deciduous and the Woolsey Fire occurred later in the Fall than the Topanga Fire. Now is about the time valley oaks would be losing their leaves. That may affect the timing of their foliage replacement. We’ll see!
Update January 2, 2019. Some valley oaks in the northeastern part of the Woolsey Fire area are starting to sprout new leaves!by
I’d done a long run the day before in Pt. Mugu State Park, so the plan for this morning was to do a short run and check out the Woolsey Fire impacts between Century Lake and the MAS*H site in Malibu Creek State Park.
In addition to checking the condition of the coast live oaks and other native trees, I was curious to see how the coast redwoods along the Forest Trail had fared. These trees were planted nearly a century ago and in recent years have struggled with the drought. Had they survived the fire?
It had been about a year since I had checked on the redwoods. The good news is that a few of them still appear to be viable. The bottom limbs on some of the trees were scorched, but I think they will be OK. Of the 16 or so redwoods, about five have died, about five are in poor shape, and five or six appear to be OK. There is one young naturally occurring tree that was severely scorched and may not survive. We’ll just have to see.
While there was some damage to the MAS*H site, the picnic tables, ambulance, and signpost made it through the fire. Some repairs will be necessary.
I was supposed to turn around at the MAS*H site, but you know how that goes. I wanted to see “just a little” of the Bulldog climb… and a little more… and a little more. I finally ran out of time about 2.5 miles up Bulldog Mtwy and headed back.
Even when you expect it, it is sobering to see areas of high soil burn severity. Thirty-six years of robust chaparral growth were just… gone. Also startling were the stream flows and debris flows that resulted from “only” about 1.5 – 2.0 inches of rainfall in early December. An atmospheric river event of the magnitude that caused the Malibu Creek flooding in February 2017 would be catastrophic.
A lot of work had been done on Bulldog Mtwy. It had been repaired and graded. Where there was still brush and trees along the road the branches had been trimmed!
Here are a few photos taken along the way.
Some related posts: Malibu Creek Flooding, Malibu Creek State Park Redwoods: Fighting the Droughtby