Driving the unpaved Forest Service Road 616 to East Lone Cone Pass
East Lone Cone Pass is a high mountain pass located in Dolores County, within the San Miguel Mountains of the southwestern sector of the U.S. state of Colorado. Traversed by the unpaved Forest Service Road 616, the mountain track climbs to a maximum elevation of 3,286 meters (10,780 ft) above sea level.
| Road facts: East Lone Cone Pass | |
|---|---|
| Location | Dolores County, Colorado (USA) |
| Elevation | 3,286 m (10,780 ft) |
| Road Name | Forest Service Rd 616 (Middle Creek Rd) |
| Length | 9.3 km (5.8 miles) |
| Hairpins | 7 sharp switchbacks |
| Surface | Unpaved (Gravel, mud, and bare rock outcrops) |
How difficult is the Forest Service Road 616 climb?
The 9.3-kilometer mountain track links County Road 49G with County Road 52, running northwest of the settlement of Dunton. The roadbed is entirely unpaved, consisting of loose volcanic gravel, embedded rock steps, and deep dirt ruts. The primary mechanical obstacle is a section containing 7 tight hairpin turns on steep gradients. These switchbacks are narrow and unmaintained, requiring vehicles to have short wheelbases and high ground clearance to clear the rocky steps without tearing off side running boards.
When do the seasonal snow gates close at East Lone Cone Pass?
Exceeding the 3,200-meter mark means the subalpine track is buried under heavy snowpack throughout the winter and spring seasons. Landslides and rockfalls frequently block the lane layout after winter storms. The Forest Service maintains closed gates from late November until late June when the surface snow melts. The safest operational driving window runs from July through September, before early autumn blizzards freeze the high-altitude dirt track into solid ice sheets.
What are the main terrain risks during summer rain?
Summer driving conditions over the pass are highly volatile due to sudden afternoon thunderstorms. Heavy downpours transform the uncompacted dirt segments between the gravel fields into thick mud lanes, reducing tire braking traction on the steep inclines. The path runs through dense evergreen forests where water runoff cuts horizontal erosion channels across the track floor, threatening to high-center vehicles that lack low-range four-wheel-drive gears (4LO).