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.


A group of buddys and I drug scuba gear in about three years ago. Has steep sides that end in a flat plan across the bottom. Very flat gray and like a silty sponge. Laying on the bottom my computer said 16' we found a 20' section of pvc and shoved it all the way down with no resistance. Few fish then expected and one large red ear slider turtle. Our second dive was at night about a month later. Soon as we entered the water something was strange. Two pairs of divers and I was leading. We planned to drop to the bottom swim across to the far bank to the north and circle along where the bank meets the flat plan bottom. As we started out I was noticing like before any silt we kicked up was quickly draw to the bottom. Now there was more water movement and even kicking the "bottom" would only cloud the water for a second. Scuba diving lakes is offen hard to see after the bottom has been disturbed. Going forward and scanning the bottom with my light I found a large opening in the bottom were the beam of my light went 30/40' unbroken below me. Within a few feet I found a second hole like this where my light just ran out into nothing. This was very unexpected and I alerted the other to leave the water. With over a 120 hours logged in caves and shipwrecks, this lil lake still is a place that makes the hair stand up on my neck

i have been told it is a fissure in san andreas fault where it surfaces and goes back under. it is very exhausting to swim in it- the current is constantly pulling you down.

I was there yesterday and it's like 5 feet deep now you can see the bottom all the way across the little pond now.

Law enforcement has named the area Fag Alley. Fags have ruined the area for others. Drove down there with the wife one day and saw some guy in a G string walking around. Got the hell out of there. Sad because entire area had so much history. Old toll station and an old camp from Dust bowl days are still visible if you know where to look. If you go there bring a gun!

Yah, i'll be sure to bring a gun because we all know how dangerous gay men are!
I was up there last year. Not many people around. 1 young guy and his girlfriend, another young family with a baby picnicking, and some kids fishing.

Its sad 1/2 of the water is gone along with a lot of the vegetation places like this won't be around much longer and not all of the "fairy tales" are true including pieces of this article

I recently got into gold panning and decided to stop by the blue cut to check it out one afternoon after work. I thought it was weird, there were lots of work trucks parked in the area. I even had a guy drive across the road and pull up next to me as I read the historical plauque about the area. But after I did some research at home I learned that area is unfortunely full of weirdos. But, I still have been back in search of gold, even taken my kids and my girlfriend and her kids. She has since banned me to take my kids again since our last visit. To many creepers, that day. I think I'm more afraid of the drug addicts or gang bangers then the homos, but they all make it a bad place. I wish law enforcement would sting the area or at least make more patrols of the area. That pass has a ton is history and its a shame to let it go like that. I would never go alone and I've considered to bring a weapon next time I go, which I will in search of GOLD!

My father was supposedly found in the lake in 1986 partly decomposed .

Visit to Lost Lake, 10-18-2007, scuba divers brought up a 6-7" green turtle, photo available. Also divers reported unexplored cavern in the lake.

the lake seemed to me to be some weird kind of
quiksand hole...creepy. i walded acrossed it last summer.
sandy muddy bottom. 3,4 maybe 5 feet of water depth. the
sandy bottom though,just may be where the bottomless thoughts
come from. maybe it could and has swallowed things of all types
that will never surface again for thousands of creepy
place,i will say that about the careful up there.


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