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.


It has recovered a bit since then. Bonus pic of my bike. Hell of a time getting it passsed two locked barriers.

So much for all of the idiots that assured us that Lost Lake was bottomless.

Went there today and there was water.

Several people have reported that Lost Lake as either bone dry or nothing but a wet mud puddle, no doubt due to the drought.

My guess is that after the last few rain storms in the last month, it's no longer dry.

Was there today, very little water.

Try Google Earth. Bone Dry.

Google Earth may not be the best source since you dont know if the image is from yesterday or from 7 years ago.

We stopped there today. It's pretty low but not bone dry. Must be seeping back up.

Local been going since i was a kid. Surely the water had gone down in the drought and i saw it at its worse, before the entire rain session of late 2015/16 it had gone down around 10 feet from the time i had been there 2 years earlier. i have never seen it dry up EVER nor have i ever seen a sand bottom through the murk of dark water there. i have gone there as a kid with my dad and know the lake surely has receded but not to a point of ever drying up. going on 30 years now.

I go deep sea (ocean) fishing. When we eventually pull up a rock fish from about 300 feet, their eyes pop out and it is a sight to see. I don't know how deep you went when you pulled out "goggle eye" from Lost lake. If you went down more than 200 feet, then the popped eyes must be due to the pressure factor associated with fish that live deep down in water, otherwise it is just part of the lake's weirdness.


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