Poison Creek Road — Bighorn Basin Floor to Sheep Mountain Anticline Overlook
Badlands, bent rock, and no one watching.
Sheep Mountain — locals call it Sheep Mountain Anticline, geologists call it one of the most dramatic surface expressions of subsurface folding in the American West — punches out of the Bighorn Basin floor like a broken spine. The Poison Creek Road off US-26/287 south of Dubois takes you directly into that fractured country, crossing alkali flats and threading between eroded badland ridges before climbing to an overlook that makes the whole tilted formation make sense at once. The road itself is straightforward hardpack for the first several miles, then degrades to bentonite clay double-track that turns to grease within an hour of any rain — and in Wyoming’s Bighorn country, that rain can come fast.
Dry conditions are non-negotiable here. Bentonite clay when wet is not a traction problem — it’s a recovery problem. In dry summer months, a high-clearance 2WD can manage the lower sections, but 4WD is needed for the upper approach and strongly recommended throughout. No permit, no fee, no services. Fuel in Dubois or Riverton. Water — don’t count on any from the landscape, the name Poison Creek is not decorative. Best window is June through September. What you get is a geology classroom the size of a county, utterly empty, with views that put Wyoming’s more famous parks to shame.
Trail Specs
| Difficulty | Moderate |
|---|---|
| Trail Type | Backcountry, High Clearance |
| Surface | Dirt, Gravel |
| Features | Camping, Remote, Scenic |
| Length (miles) | 28 mi / 45.1 km |
| Duration | 1-2 days |
| Max elevation (ft) | 6400 ft |
| Best season | June-September |
| Minimum vehicle | High-clearance 4WD |
| Nearest town | Dubois, Wyoming |
| Land manager | Bureau of Land Management, Lander Field Office |
| Permit required | No |
| Cell service | None |
| Water crossings | Yes |
| Dispersed camping | Yes |
| Official sources | blm.gov |
| Start coordinates | |
| End coordinates | |
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Location
Trail Conditions
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Frequently asked questions
Can a stock Tacoma or 4Runner handle Poison Creek Road, or does it need a lift?
A stock high-clearance 4WD like a Tacoma or 4Runner will get through fine under normal dry conditions. The trail is moderate, not a rock crawl, but the fractured shale and rutted two-track sections demand at least factory high clearance — a Subaru Outback or crossover won't cut it.
When does Poison Creek Road become impassable, and can you run it in early spring?
Best window is June through September. Wyoming badlands shale turns into axle-sucking grease when wet — spring snowmelt and early-season storms can make this road completely undriveable even for capable rigs. Don't gamble on May; check conditions with the BLM Lander Field Office before you go.
Do you need a permit to drive or camp on Poison Creek Road?
No permit required — this is BLM land managed out of the Lander Field Office, so dispersed camping is open and free under standard 14-day stay limits. No fees, no reservations, no check-ins.
What's the hardest section of this trail and what should I actually be ready for?
The climb toward the Sheep Mountain Anticline overlook throws the steepest grades and the loosest shale at you — off-camber shelf road with eroded edges and no guardrails. It's not technical rock work, but one bad line on a wet or crumbling surface and you're in trouble. Airing down and taking it slow is the move.
Is there any water on trail, and how far is the nearest gas from the trailhead?
Poison Creek itself may have water crossings depending on season, but treat anything you pull from it — this is badlands runoff country, not a mountain spring. Dubois is your last fuel stop, roughly 20-30 miles from the start, so top off before you leave town; there's nothing out here and zero cell service to call for help.
Trail track
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