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.


Yeah. I know the feeling... Like you're being "watched". ONE SPOOKY PLACE!

my dad supposedly drowned and died in that lake in the 80's did u ever hear about that I been looking for the store sreaching everthing and nothing comes up plz let me know if u heard about this

A lot of people have died in that lake over the years. I think in that last few years a man from L.A drowned, before that a little girl, I heard a few murders also! My brother in law almost drowned a couple years ago I almost drowned trying to save him!!

I heard my old neighbor Rick Glass from Ontario was murdered there years ago. They tried to make it look like suicide. Drug deal gone bad :-(

After reading some of the comments here, I realize how some of these folks are just full of shit.
The lake is not bottomless nor is it 300ft. deep. It is approximately 25ft. deep at he deepest and is fed by a break in the fault, no more no less.
As for the faggots that cruise the area on the way to the turn-off, I think the county should throw the money into whatever resources it takes to get them out of their. I moved back to so cal in 2011 and got my gold pan and stuff and headed up there to the area where the blue cut plaque is. I used to go panning and dredging in the early 90's with my friends and my kids.
As I walked down the trail that I used to use back then, I was panning when behind me and off to the side was a dude whacking his meat. I told him to get the f#@* out of their before I kicked his ass and he left. After a few hours of no luck I walked back up and saw a dozen or more vehicles with only single guys in them, that's when I realized that this place had become a faggot cruise spot. I damn sure ain't happy about this and something should be!!
As for lost lake, their are largemouth bass, crappie, bluegill and I hear, catfish. I've seen bass taken but nothing else. Nice place to visit for early morning fishing but this place gets too crowded during the summer with people who like leaving there trash laying there for someone else to pick up.

Hello there, I know for a fact that Lost Lake is NOT 25ft deep. I have been there when driver went down in it to see how deep it was but got to scared at 25ft & came back up. They have not gone all the way to the bottom.

Hello back. I hate to disagree with you but I was there just yesterday fishin for bass and was talking with a ranger who said that another dive was recently performed for the purpose of finding out why the water level is declining at an alarming rate. His most recent info. is that the depth is now at about 12ft. The lake at this rate may cease to exist in as little as 2 years according to them. Could this be an indication that the water table in this portion of the states aquifer being depleted with the lack of snow runoff and rain? Too bad, lost lake is a nice quick getaway for some stress relieving fishin.

I dove down way deeper than 12 feet and alot deeper than 25 feet so try again liars im living proof that with one breath and goggles I could not reach the bottom. So tell me again how deep.

what type of measuring device were you using to know that you were "alot deeper than 25 feet" ?
I highly doubt you could go much deeper than 15 feet unassisted and on only one breath.. That is however only my opinion, but if you did not have any way to accurately measure how deep you went, your claim is also nothing more than an opinion

Well im no Michal Phelps but I'm a great swimmer and with goggles on couldn't see no should try and see how far and what you see. And then post something just saying


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