Somewhere in the middle of every Salton Sea photo essay there is a shot of grey mud burping out of a hole in the ground. It gets called a mud volcano, it looks genuinely alien, and it is the single most-searched thing out there after Salvation Mountain.

It is also on private property with no-trespassing signs on it, and almost nobody writing about it will tell you that.

Quick Links

• What they actually are
• Why you cannot go
• The other one, the one that moves
• What to do instead

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What They Actually Are

First, the name. The US Geological Survey calls these mud pots or mud seeps, not mud volcanoes. The distinction matters a little: a mud volcano is driven by deep sedimentary gas, and what is happening at the south end of the Salton Sea is water, steam and gas rising out of a geothermal system and pushing mud around on its way up. Same effect, different plumbing.

They cluster in a spot called the Davis-Schrimpf Seep Field, out past Calipatria, on flat farmland between the highway and the geothermal plants. The mud is warm. It moves. It makes a noise. There are dozens of vents and they shift over time.

You will see the figure “500 degrees” attached to the mud in a lot of visitor reviews. That number does not appear in any scientific source and I would not repeat it.

The Kumeyaay and Cahuilla knew about these long before anyone put a road in. Testimony entered into the state record describes them this way: “No one could go close to them, for the ground was sticky and soft and the air was poisoned with gas.” The historical name recorded for the area translates as “water bewitched.”

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Why You Cannot Go

The Davis-Schrimpf Seep Field is on private land owned by River Ranch, Inc., and it is posted.

The clearest statement on this is not from a tourism board. It is a November 2024 filing to the California Energy Commission by a geologist at UC Riverside, who wrote that “the private non-tribal property is clearly flagged by River Ranch Inc. as being closed and off limits to the public.” The same filing notes that people go anyway, and what that has done: “Footprints, trails, tire tracks and trash and other public litter are abundant.”

That is the whole situation. It is private, it is posted, it is not fenced, and it is not patrolled. Which means nothing stops you, and nothing makes it legal.

Worth being honest about what that combination produces. Visitor reports over the years are all over the place — some people describe no-trespassing signs, some describe no signs at all, one says a staffer at a visitor center told them it was fine. That inconsistency is exactly what unenforced private land looks like. It is not evidence that access has opened up.

No agency has stepped in either. There is no BLM mud pot site, no state park mud pot site, no county mud pot site. The regional tourism board itself describes the formations as being on private property.

Bottom line on access: if you go, you are trespassing on somebody’s farm. That is a decision you can make, but you should make it knowing that is what it is, rather than because a listicle told you to.

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The Other One, the One That Moves

There is a second mud feature near Niland that often gets confused with the first, and its story is better.

The Niland Geyser is a single mud spring that has been slowly migrating across the landscape since the 1950s. In recent years it started moving fast — at times more than three metres a month — directly toward the Union Pacific railroad line and Highway 111. Caltrans built sheet pile walls and subsurface drainage, the railroad built a detour track, and a contingency road was cut west of the highway in case the thing kept coming.

As of a study published in September 2025, the mitigation worked: the spring has slowed and has nearly stopped moving.

You cannot visit this one either, and here the closure is official rather than implied. Caltrans states it directly: “For safety reasons, there is no access to the mud pot and public site visits are prohibited.” A geological society that wanted to see it needed months of negotiation with Union Pacific and a safety briefing from a Caltech scientist first.

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What to Do Instead

If what you wanted was the strange geology of the south end of the sea, you can get most of the way there legally.

Drive past the geothermal field

The plants along Highway 111 south of Niland are the same heat source that drives the mud pots, and they are an odd enough sight on their own — steam, pipework and salt flats in the middle of farmland. You are not stopping, you are just looking out the window on the way somewhere else.

Rock Hill, at the wildlife refuge

Rock Hill is a volcanic remnant — the same geology, above ground. There is a trail up it, it is free, and the view from the top takes in the ponds, the playa and the plants at once.

906 West Sinclair Road, Calipatria · sunrise to sunset, year round · no fee

Make the call yourself

There is one lead worth chasing. A California Department of Fish and Wildlife magazine article described a mud pot viewing area at the Imperial Wildlife Area, off Davis Road, with parking and disabled access. That article is from 2001, and CDFW’s current page for that wildlife area does not mention mud pots at all. It may still exist. It may not. If you want to know before driving out, call the wildlife area and ask.

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Bottom line: The mud pots are real, they are strange, and they are on someone’s farm. Everything else worth seeing down there — the sea itself, Slab City, Salvation Mountain, Bombay Beach — you can actually walk up to.