The Mystery of Lost Lake of the Cajon Pass

It is not known to many people, but it is still possible to use the old highway up through a portion of the Cajon Pass. Present day highway 15 runs well above old 395 and Historic Route Highway 66. Such rustic areas as Blue Cut and Halls Ranch (Yes my Family again), and Sullivan's Curve still exist.

As you drive up the badly surfaced road from Devore (Use the Kenwood Exit from the Northbound 15 and make a left, pass under the 15 and then make a right on Cajon Blvd [old 395 & route 66]) you notice that for the most part you are driving on what would be the southbound lanes of the old 4 lane highway. As you come around the curve at Blue Cut you notice that there is now a mountain sitting over the right-hand lanes into the center divider. You might think that this is ample proof that the San Andreas Fault zone is alive and moving. But you would be wrong. It is actually the San Jacinto Fault Zone that straddles the highway. The San Andreas is still one mile ahead.
Two Faults zones so close together and visible? As you proceed north you notice that the entire area between the faults is moving to the north and at different speeds. Only 2 or 3 inches a year, but they are moving. So much so, that railroad crews from both the Union Pacific and Burlington Northern Santa Fe, have to go out twice a year and reset the tracks. Otherwise, the train tracks would bend out of shape, just like old 395 has.

As you proceed, you will see a sign that says 'Lost Lake'. It also says private road so most people ignore it and just keep heading up towards Sullivan's Curve. Sullivan's Curve by the way, is a favorite Train Watcher area and has also been the scene of several major train accidents over the years. The best way to get into this area is to exit highway 15 at Cleghorn Pass Road, make a left under the freeway if you are going north bound that is and then make a right on the first roadway you see. This will take you back to a triple track bypass area, a small yard, and the beginning of the lower end of Sullivan's Curve.

But if you take the time to make the left turn onto the dirt road and cross the triple set of tracks that tend to hide it's route, you eventually find a quiet little area that should not exist. For there are no streams, creeks or rivers that feed into Lost Lake. The water seeps up from beneath the ground. A direct result of two major earthquake faults zones passing within a half mile of each other.

Some say that Lost Lake has no bottom, that it feeds directly from the center of the earth. The water is also very cold, below freezing even in summer time. Fire crews have used its water supply to help fight fires, and they have never noticed a drop in water levels. It always stays the same, even in heavy rain seasons. And snow fall has no effect on it. But it has never frozen either.

Lost Lake is surrounded by lush grassy vegetation, some what like what you might see back in Kentucky or Tennessee. In fact Kentucky Blue Grass grows all around the lake.

As you drive further into the narrow valley you realize that both fault zones are coming together. All of a sudden you run into a wall of a mountain that blocks your way. You can climb up this 500 foot high rock fall and look out over the valley you have just passed through. To the northwest are the 10,000 peaks of Mt Baldy, Cracka Ridge and the Mountain High Ski area. As you hike through the area you become aware of how insignificant you are amongst the grander of the Fault Zones, the Mountains and the trees.


So, in other words, you have no idea how deep you really were.
I would also suspect that in any even semi-dirty lake, once you are deeper than 10 or 11 feet, the visibility would drop to inches. So even if you made it to 15 feet, the bottom could have been 2 inches from your fingers and you would not be able to see it.
I don't need to try and do it myself because the guy above already posted that the rangers did it for us, and they measured it, so I'm going with what they came up with.

You shouldn't take their word if you read it correctly the ranger didn't dive themselves. All im saying you should grab a some goggles swim to the middle and see how far u can go. A decent swimmer can easily go deeper than proof.

I been going to lost lake for over 20 years and yeah it has a bottom but it all depends on how long you could ur breath in and specially after 20 feet with no oxygen bottle u pretty much give up and re-surface.

Alright your correct & I am not ! Thanks for your information.I Greatly appreciate it.

I finlally got to lost lake I've been told about it my whole childhood life and had to go check it out for myself if if was really true what my family had said. They spent months up at lost lake back in the late 50 early 60 and went every summer after that until the 80. I toke me my husband and my kids we were summing only on shore but we for there at like 5 pm and the water was great just right temp. We were there 30 mins when my husband was being bit on the toe by a black fish with fins that were like spikes so we move closer to shore and water started coming in cold from the bottom for some reasion but it was a good way to cool off and I also drove down drit road and lost of people live on that road and it beautiful to me all natrial living in the fault line.whele we wer at the lake I smelled suffer smell mixed with wet weeds and fish

I was at lost lake about a month ago and the gate was closed. Everybody was parked on the side road and I couldn't find parking so I decided to take the family to the creek below. We were walking down that brushy trail that leads to the creek and there and behold were a couple faggets going at it!! My kids saw that and I got pissed and told them to take their homo shit somewhere else!!

I've heard that road is a paradise for that activity!

I agree something should be done! I used to go there a lot, but then the gays started gathering there more and more until I just quit going. What really pissed me off was when I returned to my car one day, there was a flyer on my window reading "Are you gay, curious? Be here at 8PM!" Maybe I should have shown up... Guess I'll never "know"! (LOL)

Maybe I'll invest in a drone, paint it up with the Sheriff's logo, and buzz the "hot" zones!
I'm sure THAT video would go viral real quick!

Ok, this is official. Last week the USGS was at the lake doing surveys and has listed the lake at an 8ft. maximum depth. The lack of rain and snow runoff are depleting the aquifer. The width, from north to south, is approx. 225ft. and the breadth, from east to west is just shy of 50ft. The water level has dropped approx. 8ft. within just the last year. Fishing has been slow as the drop in the water level has given the fish more to feed on than they can actually eat plus the fact that all the pigs, I mean visitors, have polluted the water with trash of all sorts...cans, bottles,(broken and whole),paper, plastic, diapers, graffiti, etc., etc. There are trash cans for your convenience to dispose of your trash as you leave but people find it to hard to pick up after themselves. One can only imagine what there homes look like.
If the forest service decided to close the lake to the general public because of the amount of trash left behind, I wouldn't blame them one bit.
Well, if we don't get enough rain soon to replenish the aquifer to a lake sustaining level then this little gem will soon become a stinky algae trap with no fish but then maybe we can at least get all the trash out of the area.
Enjoy it while it lasts because at this rate it won't be but a memory within approx. 1 1/2 to 2 years, if that.


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