Bitterroot Divide Road (Forest Road 739)
High-altitude ridge running on the Continental Divide
Forest Road 739 snakes along the Bitterroot Divide at 7,000+ feet, straddling the Montana-Idaho state line through some of the most remote wilderness in the lower 48. This knife-edge ridge route connects Highway 93 south of Darby to Forest Road 5631 near the Selway River, threading between designated wilderness areas where cell service died 30 miles ago. The road surface alternates between loose rock and ancient roadbed carved by Depression-era CCC crews, with several creek crossings that can run deep during snowmelt.
This is solid intermediate territory requiring high-clearance 4WD and recovery gear — the narrow shelf road has few turnarounds and zero room for error. Best tackled July through September when snow clears, though afternoon thunderstorms can turn the route into a muddy nightmare. No permits needed, but fuel up in Hamilton and pack water for 2-3 days. Dispersed camping is outstanding along the divide, with endless peaks stretching into Idaho’s Frank Church Wilderness. You’ll earn every mile of this backcountry masterpiece.
Trail Specs
| Difficulty | Difficult |
|---|---|
| Trail Type | Technical 4x4 |
| Surface | Rock |
| Features | Camping, High Altitude, Remote, Scenic |
| Length (miles) | 47 mi / 75.6 km |
| Duration | 2-3 days |
| Max elevation (ft) | 7850 ft |
| Best season | July-September |
| Minimum vehicle | High-clearance 4WD |
| Nearest town | Hamilton, MT |
| Land manager | Bitterroot National Forest |
| Permit required | No |
| Cell service | None |
| Water crossings | Yes |
| Dispersed camping | Yes |
| Start coordinates | |
| End coordinates | |
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| Find on Google | Search on Google → |
Location
Trail Conditions
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Frequently asked questions
Can a stock Jeep Wrangler handle Bitterroot Divide Road?
Yes, but you'll need aggressive tires and skid plates. The rocky surface will punish your undercarriage, and some sections require precise line choice to avoid body damage.
Is Forest Road 739 open in early July?
Usually not until mid-July due to snow at elevation. Call Bitterroot National Forest at (406) 363-7100 for current conditions before making the drive.
Do I need any permits to drive the Bitterroot Divide?
No permits required for driving or dispersed camping. This is National Forest land with standard forest service rules.
What's the hardest part of this trail?
The rocky ascents above 7,000 feet where loose talus and embedded boulders demand crawling speeds. One wrong move sends you sliding backward down the mountainside.
How many days of water should I bring for this trail?
Pack 3-4 days minimum since reliable water sources are scarce along the ridge. There are a few seasonal streams, but don't count on them in late summer.