Weather and water update 19th August 2021

Regrettably monsoonal weather conditions in the past week did not produce significant precipitation in the San Jacinto mountains, and the monsoon pattern appears to have shifted away from us for the remainder of August. On the plus side, a major cooling trend for the next few days will take daytime high temperatures below seasonal averages for the first time this summer (discussed in Weather below). Daily wilderness hikes continue to include San Jacinto Peak multiple times per week, and Tahquitz Peak weekly, both by a variety of routes, plus various other trails, facilitating regular checks of water sources and trail conditions.

Hikers should be prepared for rapidly changing weather conditions in the high country in summer. Thunderstorms with lightning, precipitation, and rapid temperature drops can occur in the high country even when such storms are not forecast for lower elevations, usually most likely in the afternoons.

Full fire restrictions are in place on Forest Service lands, as described here. All campfires anywhere in the San Jacinto mountains, including at all USFS campgrounds and yellow post sites, are now prohibited.

Water conditions in the high country are poor and continue to deteriorate. The current status of many key springs and creeks is described below.

The U.S. Forest Service ranger station in Idyllwild remains closed due to USFS coronavirus protocols. Apparently it is unlikely to reopen before October. Hiking and camping permits are nevertheless required for USFS lands, and should be available at the kiosk outside the ranger station. The State Park ranger station reopened many months ago.

WEATHER Daytime high temperatures are falling rapidly to several degrees below seasonal for 18th-21st August. It should feel delightfully cool compared to the past two months! While overnight low temperatures will also fall dramatically compared to recent weeks, they will still largely be at or even slightly above seasonal norms. From Monday 23rd onwards, day and night temperatures will climb again to above average, with another heatwave currently forecast for the last week of August. Fire risk remains severe.

At San Jacinto Peak (10,810ft/3295m) on Thursday 19th August 2021 at 0830 the air temperature was 48.9°F (9°C), with a windchill temperature of 41.7°F (5°C), 15% relative humidity, and a light WSW wind sustained at 6 mph gusting to 10.1 mph.

At the Peak on Monday 16th August 2021 at 0805 the air temperature was 60.2°F (16°C), with a windchill temperature of 56.8°F (14°C), 57% relative humidity, and a pleasant NNW breeze sustained at 3 mph gusting to 8.5 mph.

At the Peak on Monday 12th July 2021 at 0810 the air temperature was 67.6°F (19.8°C), with a “windchill” temperature of 67.2°F (19.6°C), 38% relative humidity, and a very light NNE breeze sustained at 2 mph gusting to 7.2 mph. This the highest air temperature ever reliably recorded at San Jacinto Peak, shattering the previous record temperature of 62.3°F (16.8°C) observed on 19th August 2020.


Trails throughout the San Jacinto high country cleared of snow by early May. Water conditions are a major concern, with many springs and creeks already having dried up or having very low flows for the time of year, as discussed in detail below.

The rockslide at PCT Mile 172.5, just north of Antsell Rock, was removed on Monday 14th June. My “before, during, and after” video is available here. This section of the PCT is now safer and is readily passable with care by hikers (but still not by stock).

Many trails have accumulated treefall hazards from the past two winters, passable with care by hikers but not for stock. Although they are reported promptly, regrettably neither Forest Service nor State Park have moved quickly to remove these hazards. Some are described below, others include the PCT between Strawberry Cienega and Deer Springs camp (PCT Miles 182-185, about 12 trees down), and Fuller Ridge Trail near its northern end (PCT Miles 189.1-190.2, three trees).

Spitler Peak Trail was cleared of multiple tree hazards by the Trail Report in early July.

Many treefall hazards from Red Tahquitz to Antsell Rock (PCT Miles 172.5-175) were cleared in June. Nevertheless about 20 remain, including at least six major obstructions for hikers. Tahquitz Creek to Red Tahquitz (PCT Miles 175-177) was cleared in early June.

Willow Creek Trail has at least 33 downed trees between Skunk Cabbage Junction and Hidden Divide. Of these 22 are on the Forest Service section (16 between Willow Creek and the Park boundary), with 11 in the State Park. Most are readily passable by hikers with care. Despite so much work last year, the whitethorn has grown back rapidly, especially on the State Park section, but still remains less challenging than in 2019.

The Caramba Trail from near Reeds Meadow through Laws Camp and on to Caramba, and the Cedar Trail from Willow Creek Trail to Laws (which both nominally reopened in late 2018) are optimistically described by the Forest Service as “not maintained”. In reality parts of these trails no longer exist with significant sections of both so heavily overgrown that I strongly advise hikers do not attempt to follow them. Multiple experienced hikers have reported getting lost in this area since summer 2019. An informal use trail to the Laws Camp area is much more direct and completely avoids all of the challenging bush-whacking of the unmaintained trails (other hikers kindly nicknamed it the “King Trail”). It leaves Willow Creek Trail exactly 1.0 mile from Saddle Junction, 0.45 mile from the Skunk Cabbage turning (trailhead at N33°46’46”, W116°39’32”, WGS84). The cairned use trail descends largely on established deer tracks for 0.9 mile, reaching Willow Creek just upstream of the former site of Laws Camp. From Laws east to Caramba the route of the old Caramba Trail has become increasingly tricky to follow, especially for the first 1.2 miles east of Laws where there are dozens of trees down. Closer to Caramba the trail is relatively obvious (for those familiar with the route prior to the 2013 Mountain Fire). Very cautious navigation is recommended throughout this area.

Seven Pines Trail has had limited hiker traffic since November 2018. There are 35 treefall hazards on the trail, four large ones on the short Forest Service section, and the remainder in the State Park, based on my most recent 2021 survey. Cautious navigation is recommended for those who are not familiar with hiking this trail. Dark Canyon Road has been closed since early 2019, and there is currently no vehicular access to Seven Pines trailhead. USFS apparently does not expect Dark Canyon Road to reopen this year.

WATER STATUS: Eastern slope

The Round Valley pipe continues to flow weakly (at about 0.4L/min) as of last week. This source may not be reliable beyond August. Creeks in Round Valley and Tamarack Valley were dry in May (in 2020 neither dried until August).

Hidden Lake dried up completely in June.

Both the northern and southern springs at Wellman’s Cienega are flowing very gently (but adequately to filter). These are the sources for Willow Creek, which is flowing where it crosses the Willow Creek Trail (on 4th August the flow was good for filtering, but was the lowest I have ever seen this creek).

Tahquitz Creek is flowing gently at the northern end of Little Tahquitz Meadow. It is also flowing, but very gently, further upstream at its source (known locally as Grethe Spring) where it crosses the PCT at approx. Mile 177.

Tahquitz Creek flowing gently at the north end of Little Tahquitz Meadow, 10th August 2021.

The small creek in Tahquitz Valley dried in May, some four months earlier than in 2020.

Candy’s Creek – that flows through Skunk Cabbage Meadow and then crosses the remaining visible section of Caramba Trail near Reeds Meadow – dried up in early July.

WATER STATUS: Western slope

The North Fork of the San Jacinto River continues to flow steadily where it crosses the Deer Springs Trail and also downstream – but much more weakly – where it crosses the Fuller Ridge Trail on the PCT (approx. PCT Mile 186.2).

The creek in Little Round Valley completely dried up in early July, reminiscent of the extremely dry years of 2014-16. The same creek dried up where it crosses Fuller Ridge Trail (PCT Mile 186.4) in April.

Shooting Star Spring (not far below Little Round Valley but above the North Fork of the San Jacinto River crossing) is flowing weakly and is a very poor option for filtering.

The Deer Springs stream crossing is dry at the PCT/Deer Springs Trail (approx. PCT mile 185.6). (Despite some online mapping to the contrary, this is NOT the source for the North Fork of the San Jacinto River.)

The tiny but perennial spring about 0.4 miles north of Strawberry Junction (known colloquially as Switchback Spring) continues to flow well. I rework the tiny pool once or twice every week when I pass by and there is just sufficient depth from which to filter water.

The little creek at Strawberry Cienega (PCT mile 183.0) is functionally dry. The tiny pool, just a few inches in diameter, is not adequate for filtering (I nearly drained it dry trying to filter 0.25L in late June!).

On Devil’s Slide Trail, Middle Spring is now dry. All other springs on this trail have been dry for months.

On the Ernie Maxwell Trail, the crossing of Chinquapin Creek just below Humber Park is currently flowing where it crosses the trail. Even when dry across the trail, small but invaluable fresh pools remain just upslope from the trail (this creek is an especially useful source of water for the many dogs walked on this trail).

The faucet at Cinco Poses Spring about 4.5 miles up Black Mountain Road continues to flow.

WATER STATUS: Desert Divide

Live Oak Spring (N 33 37 21, W 116 33 24) Flowing. The most reliable water source on the Desert Divide.

Cedar Spring (N 33 40 36, W 116 34 35) Flowing. Easiest access is the trough about 60 yards upstream from the trail to the campsite.

Apache Spring (N 33 43 11, W 116 37 13) Barely trickling, not now reliable.

Spitler Peak Trail Descending the trail from the PCT there are five water crossings. The first two, at 0.9 and 0.95 miles down, cross a tiny side creek which is largely dry and should be ignored. The next crossing, at 1.1 miles down, is Spitler Creek and is the best source of water (currently flowing very gently, but can be filtered). The next two crossings are the same creek, also flowing adequately for filtering.

Antsell Rock Creek (N 33 41 52, W 116 39 08) Right by the Spitler Peak Trail trailhead on Apple Canyon Road, Antsell Rock Creek is now dry. Even in the very dry years of 2015 and 2016, this source did not dry until the autumn.

The array of challenges facing volunteer rangers is considerable. Above, about 15lb of trash I packed out from an abandoned campsite (complete with illegal fire ring) near Tahquitz Meadow, 10th August 2021. Below, an abandoned “vehicle” on May Valley Road which I reported to Forest Service in July but was still there on 12th August. Bottom, at the top of South Ridge Road someone drove over and flattened bollards designed to prevent vehicle damage to a burn area, 11th August.

Thank you hikers for taking the time to read this. While all labor and time is volunteered, the San Jacinto Trail Report completely depends on small private donations to cover operating costs. Every year seems to be challenging and 2021 has been no exception, so every contribution, no matter how small, is truly valuable. If you have found this Report useful, please consider visiting the Donate page. Thank you for your support.

2 thoughts on “Weather and water update 19th August 2021

  1. Hi, SanJacJon, I’m contacting you because I think you would be able to provide the most definitive answer to what my fellow hiker and I saw on the Willow Creek Trail, not terribly far from Saddle Junction. We do not agree on our observations. The following happened in the evening of August 24th, 3 days ago. It happened quickly, but heading back on Willow Creek Trail towards The Saddle, we saw 2 running tan mammals. They looked like mountain lion cubs to me, about pre-adolescent age. My friend thought they were someone’s dogs. I didn’t think they moved like dogs, nor shaped quite right. Then right before they ran out of sight, going the same direction, and looking at them came a lone fawn, no mother in sight. It was wandering in that area, looking kind of confused the whole time with no mother in sight. When we did leave, it was still there. I’ve watched your recent cam videos of a female mountain lion from May and June 2021. Were these videos taken in an area that would include where we were and also be in her territory? I think it definitely looks like it could be. My friend and I discussed why a fawn would be alone and also why 2 young “teenage” cougars would also be without mom and be together. A possibility popped into my mind: Mom cougar offed mom deer. Mom cougar wanted to eat her fill before the cubs (who she thinks are about the age that should start learning to hunt on their own if they do not want to have to wait till Mom is finished.) That might explain why the cubs were running off. (Mom angerly sent them off running while she was eating.) If the fawn witnessed the attack on its mother, that might explain why it was wandering and confused, and in effect following the cubs. So. I am wondering… Is there a female cougar with cubs in that area? Have you seen or smelled a cache of a doe in the area? Any other insight you could give us? My friend and I have both been researching and going back and forth discussing this scene. I doubt anyone knows the mountain as well as you, so I’m hoping for more insight about just what we saw. BTW, I think you passed us while we were going up Devil’s Slide. We passed the ranger coming down and he asked if we said hi to you because you were heading down and we should have passed eachother. If we did pass, we decided that we probably didn’t recognize you without all the ice on your face from the Trail Reports. 😄 We were two older men and an older lady (me.) I appreciate any insight you might be able to give us 3 curious souls. Thank you, Catherine Peterson

    On Mon, Aug 16, 2021, 5:02 PM San Jacinto Trail Report wrote:

    > sanjacjon posted: ” Regrettably periodic monsoonal weather conditions in > the past week did not produce significant precipitation in the San Jacinto > mountains, and the monsoon pattern appears to have shifted away from us for > the remainder of August. On the plus side, a major” >


Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s