Ten Sleep Gash

A little geologic curiosity has occurred near Ten Sleep, Wyoming.  We seem to be the focus of national and international questions about the Ten Sleep Gash, aka Big Horn Mountain landslide, which happened south of town in the past month.

It was first reported by SNS Outfitter and Guides on their Facebook page.  I saw it soon after posting and thought “Cool… I’d like to see that… I wonder where it is?” but, honestly, didn’t give it TONS of thought!

It’s a very impressive picture…

gashA couple of days later… after many comments and shares on Facebook, they posted another photo… One that included a hunter walking along the edge… giving a little perspective.closeupgash


Measurements with a range finder (what else) approximate the Gash at 50 yards wide and 750 yards long.  Well, neat!  I saw it posted on Facebook again and again.  My brother-in-law is a geologist and we thought we should go see this if I could find out where it is.  A few questions to some friends later, we decided maybe “someday”, but this is on private land, and I’m sure the rancher has much more to do than sit out there and chase off trespassers!!!  Don’t forget, SNS Outfitter is still guiding hunters in the area!

They also gave this explanation of the phenomena.  “An engineer from Riverton, WY came out to shed a little light on this giant crack in the earth. Apparently, a wet spring lubricated across a cap rock. Then, a small spring on either side caused the bottom to slide out. He estimated 15 to 20 million yards of movement.”

While this is a big slide, smaller ones like this happen all the time in this country.  Many formations around here are full of springs… gypsum, slate, bentonite, and sandy soils are common rocks, combine them in various conditions and you have dirt sliding, slumping, and cracking.  Brandon has had a very deep crack around his house (one time a bum lamb was lost to it) which we continue to fill in periodically.  I do admit this one wins the prize though!

Further photos were posted on the internet by Randy Becker showing much more detail.


This one, taken from the other end, shows all the dirt slumped into the valley.

wyoming_earth_crack3This one looks like the set to a Hollywood movie!

Here’s some of my answers to popular questions I’ve seen on the internet.  I’m not an expert, but I have played one in my mind… 😉

  1.  Is it because of fracking?  No, there are not any wells close to this area.
  2.  Is Yellowstone about to blow up?  I hope not!  This doesn’t appear to be related to volcanic activity.
  3.  Any ancient aliens around?  Nope, just modern ones…
  4. Anyone/anything hurt?  Two antelope and an elk.  No, I’m kidding.  Nothing more than the bugs in the grass that got the shock of their lives!
  5. Can I go see this?  It’s on private land. No. If I hear they are starting to give tours, I’ll let you know!
  6. Is it going to get bigger?  I’m not a geologist… and I’m not sure they’d want to predict either.  Just by the photo, I’d say no, that the slump took all it could, but, again, I’m not an expert.
  7. Did you feel it move?  Was there an earthquake?  No and No. No earthquakes have been listed on my Quake Feed, but holy cow, Oklahoma and Kansas!  You’re getting a lot of 2’s and 3’s!!!

There you have it, the biggest news in Ten Sleep… a slice of earth slides sideways and we get our 15 minutes of fame.  If I ever get to go see it myself you KNOW I will share photos…

If you’re new to Red Dirt and came to read about the Ten Sleep Gash, welcome.  Stay a while and check out some old posts!  If you’re interested in The West, curious about where your beef comes from, or you just love Wyoming’s wide open spaces, you might just enjoy this blog!


Ten Sleep Gash — 12 Comments

  1. I was trying to find this location on Google Earth but could not. Do you know a road or any landmark to find it? GPS coordinates?

    • I rather doubt it’s on google earth quite yet. How often do they update the maps? Anyway, it’s on private property, so I’m respecting their privacy…

  2. Pingback: 2015 In Review |

  3. Carol, thought you’d get a giggle that this just showed up in the LA Times today. The last photo – the one you said looks like a movie set – is the lead-in. I got the giggles because I’d already seen it here. Hey, I beat the LA Times! Also, the included map showed Ten Sleep and Gillette. So, I recognized Ten Sleep because of you and Gillette because my husband was there for awhile as part of an investigation.
    Linda Watson recently posted…Repeating the StoryMy Profile

  4. WOWEEE!!!!! This is astounding and amazing. And it’s the first I have heard about it. It certainly looks mammoth, but really is tiny compared to the entire earth. Great pictures and writing. Thanks.

  5. Thanks for the update! We’ve been following it, but our connection w/ internet a very on/off thing. We think we sort of have it placed and have noted most of the news feeds say “Casper”. We assume it’s because they cannot spell Ten Sleep? Glad this one is not next to Brandon’s house…or anyone else’s house!

  6. That is astounding. I’ve never heard or seen anything like that before! I’m always interested in geology and archeology so it is amazing to see that. Thanks.

  7. My grandson was on the mtn the first of the week and was looking at the pics that were available. He is Dr. Moses with a PHD in Paleontology & Geology/GeoChemistry. He predicted that the Becker picture with the dirt humps (the toe of the slide) would eventually continue to slide. He too would love to see it. Won’t be surprised if he finds a way to have a look. Keep up the great writing.

  8. I just saw something about this yesterday and started to look into it, but got sidetracked. I hadn’t realized it was so near you. So interesting! Thanks for filling us in! 🙂

Leave a Reply

Your email address will not be published. Required fields are marked *

CommentLuv badge