Lonesome Highway — Centennial Mountains Divide to Elk Lake via Sheep Creek Basin
Grizzly country divide run above the Idaho line.
The Centennial Mountains form a hard, lonely wall along the Montana-Idaho border west of Yellowstone, and the road that rides their spine is the kind of route that earns its miles. Starting near Lima, Montana, and threading southeast along the Continental Divide, this run crosses Sheep Creek Basin — open, windswept country where pronghorn ghost across the sageflats and the occasional grizzly track reminds you this isn’t a family day-trip. The descent to Elk Lake drops through lodgepole timber before the glassy water appears below you, one of the cleanest views in southwest Montana.
This is a dirt and gravel high-country route — not technically gnarly, but long, isolated, and susceptible to mud that’ll swallow a street tire and hold it. A stock 4WD with good all-terrains handles it in dry conditions; wet spring runs demand real mud capability. No fuel between Lima and Island Park — top off before you leave. Cell service is zero out here. Run it July through September before the shoulder-season snowstorms roll in. Dispersed camping is legal across much of this BLM and USFS corridor, and you’ll want to use it.
Trail Specs
| Difficulty | Moderate |
|---|---|
| Trail Type | Overland Route |
| Surface | Dirt, Gravel |
| Features | Camping, High Altitude, Remote, Scenic |
| Length (miles) | 48 mi / 77.2 km |
| Duration | 1-2 days |
| Max elevation (ft) | 8400 ft |
| Best season | July-September |
| Minimum vehicle | Stock 4WD high-clearance |
| Nearest town | Lima, MT |
| Land manager | Beaverhead-Deerlodge National Forest / BLM Dillon Field Office |
| Permit required | No |
| Cell service | None |
| Water crossings | Yes |
| Dispersed camping | Yes |
| Official sources | Beaverhead-Deerlodge NF BLM Dillon Field Office |
| Start coordinates | |
| End coordinates | |
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Location
Trail Conditions
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Frequently asked questions
Can a stock 4Runner or Wrangler run this trail without modifications?
Yes — stock 4WD with decent ground clearance handles this route. Dirt and gravel surface is the norm, but ruts and soft spots after rain can bite low-clearance rigs, so a lifted or stock high-clearance 4WD is the honest minimum.
When does this route actually open up in the spring, and when does it close?
July through September is the reliable window. At 8,400 ft max elevation straddling the Centennial Divide, snow lingers well into June and can return early in October — check with Beaverhead-Deerlodge NF before planning anything outside that window.
Do I need a permit to drive or camp out here?
No permit required to drive the route. Dispersed camping is allowed under standard National Forest and BLM rules — 14-day stay limit, 200 feet from water and trails. No fees as of now, but confirm with the BLM Dillon Field Office for current conditions.
What's the hardest section and what should I actually expect?
The route earns its moderate rating mostly through remoteness and elevation, not technical obstacles. The roughest stretches are along the divide itself where the road can wash out or get muddy — nothing that requires lockers, but slow down and read the road, especially after recent rain.
How far is it to the nearest gas, and is there any cell service on route?
Lima, MT is your last reliable fuel stop before heading out — plan accordingly for a 48-mile route with no services. Cell service is nonexistent the entire run, so download offline maps and have a satellite communicator if you're heading into this grizzly country solo.
Trail track
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