Landslides risk in Wyoming

The first time a crack shows up across your driveway in Teton County, you might blame the frost. Then the crack widens after a wet spring, and the corner of your garage starts to pull away. That’s when landslide risk stops being a map layer and becomes your Tuesday.

Wyoming’s statewide landslide rating is 2 out of 5. That’s moderate. But the risk isn’t spread evenly. If you live on the plains near Gillette or Torrington, your odds are low. If you live on a slope in Jackson Hole, the Bighorn Mountains, or the Wyoming Range, this is a real part of owning a home.

Who this hits hardest

You’re most exposed if your house sits at the bottom of a steep grade, on a fill slope, or below a road cut. Teton County, Park County, and Fremont County have the classic setup: mountains, canyons, and spring snowmelt that saturates the ground. Lincoln County and Sublette County see it too, especially along the Salt River and Green River corridors. In Sheridan County and the Bighorn Mountains, the mix of steep slopes and older rural roads means a slide can cut you off even if it misses the house.

Renters and buyers in Carbon County and Albany County run into this near the Snowy Range and Laramie Range. It’s not just the high peaks. Debris flows can run down gullies and hit homes that sit well below the source. If your property has a creek, a culvert, or a seasonal spring, pay attention.

One more group: anyone who bought after a wildfire. A burn scar changes how water moves. Rain that used to soak in now runs off, and that can trigger a debris flow a year or two later. If you’re in a burn area near the Absaroka Range or the Wyoming Range, give yourself a longer look.

Wyoming has no coastline, so this is a mountain and canyon story. The state’s rating of 2 doesn’t mean your specific slope is a 2. It means the state as a whole is moderate, with pockets of high risk.

After the event — claims and repairs

Here’s the hard part. Your standard homeowners policy almost never covers landslide. The exclusion is called “earth movement,” and it covers settling, sinking, and sliding. Even if a mudflow comes with a flood, flood insurance may cover the mudflow but not the landslide that started it. That’s a distinction your adjuster will make. Earthquake policies often exclude landslide too. So the default answer is: you’re paying for this yourself unless you bought a specialty difference-in-conditions policy before the slide.

After a slide, document everything before you move a shovel. Photograph cracks, boundaries, and anything that shifted. Call your insurance agent anyway, even if you expect a denial. Get the denial in writing. Then call a geotechnical engineer, not just a contractor. A contractor can rebuild a wall; an engineer can tell you if the slope is still moving. Repairs often mean drainage control, retaining structures, and sometimes moving the house or abandoning part of the lot. FEMA individual assistance may be available after a federal disaster declaration, but it’s not a substitute for insurance and it’s not guaranteed. Wyoming Office of Homeland Security is the state agency that coordinates with local emergency managers, so check their site during an event.

Before the season starts

Landslides in Wyoming often happen in spring, when snowmelt meets heavy rain, or during intense summer thunderstorms. Freeze-thaw cycles also loosen rock. So the time to look is now, before the ground is saturated.

Walk your property. Look for new cracks in the foundation, doors that stick, windows that won’t close, tilted trees, or fence posts that have moved. Check your downspouts and gutters. Water that dumps next to your foundation is a problem. If you have a septic system, watch for new wet spots. If you see a spring where there wasn’t one, that’s worth a call.

If you only have one weekend and a few hundred dollars, spend it on a geotechnical engineer’s walk-through if you see any of those signs. Skip the new sump pump until you know where the water is coming from. For everyone else, make a plan: know two ways out of your neighborhood, keep an emergency kit in your car, and sign up for your county’s emergency alerts. Ready.gov has a good landslide and debris flow checklist.

Don’t try to stop a moving slide with a Bobcat. That’s how people get hurt.

Questions we get

Does my Wyoming homeowners insurance cover landslide damage?

Usually no. Standard policies exclude earth movement, which includes landslides. You’d need a separate policy, often called a difference in conditions or DIC policy, and even those may have exclusions. Ask your agent directly and get the answer in writing.

Is a landslide the same as a mudflow for flood insurance?

Not exactly. The National Flood Insurance Program covers mudflow, but it defines that as a river of liquid and flowing mud. A landslide is the downslope movement of rock and soil. If your flood policy pays, it may only pay for the mudflow part, not the slide. In Wyoming, few homeowners have flood insurance anyway, so don’t count on it.

Where can I find landslide maps for Wyoming?

Start with the USGS Landslide Hazards Program. They have statewide susceptibility maps and explain how to read them. The Wyoming Office of Homeland Security also has local hazard mitigation plans that can point you to county-level information. No map is parcel-perfect, so use it as a screening tool, not a verdict.

Official sources

• Wyoming Office of Homeland Security
• USGS Landslide Hazards Program
• Ready.gov – Landslides and Debris Flow