How dangerous is the 29-hairpin road passing Qullqi in Peru?
The road flanking the western slopes of Qullqi (also known as Colqui) is one of the most extreme high-altitude tracks in the Huarochirí Province of Peru. While the mountain peak towers well above 5,000 meters, the narrow gravel road itself reaches a staggering 4,765m (15,633ft) above sea level. This is a primitive Andean route where the thin air, the vertical drops, and the 29 relentless switchbacks create a mechanical and mental test that is only suitable for prepared 4x4 vehicles and experienced mountain drivers.
| Road facts: Qullqi Pass (Colqui) | |
|---|---|
| Location | Huarochirí, Lima Region, Peru |
| Max Road Elevation | 4,765 m (15,633 ft) |
| Length | 30 km (18.6 miles) |
| Hairpin Turns | 29 extreme switchbacks |
| Surface | Narrow Gravel / Unstable Dirt |
How long is the 29-hairpin climb past Qullqi?
The route stretches for 30 km (18.6 miles), serving as a high-altitude link between the LM-116 road and Acobamba. The drive is defined by 29 hairpin turns that are so tight and narrow that it is impossible for two vehicles to pass each other. As you climb the western side of the Qullqi massif, the track becomes a sheer shelf road with no guardrails. If you meet an oncoming truck, the lack of space means someone will have to reverse back down the 4,765m slope, often for hundreds of meters, balanced on the edge of a massive drop where the loose gravel offers very little grip.
What are the road conditions on the Qullqi western track?
The surface is a mix of disintegrated rock and dry silt that is constantly shifting. As seen on the steep Andean slopes of Huanza, the road is barely wide enough for a single 4x4. The 29 switchbacks are particularly dangerous because they are often undercut by erosion, leaving the outer edge of the turns unstable. A high-clearance 4x4 with low-range gearing is mandatory to negotiate the steep ramps; without it, your tires will simply spin on the loose mountain scree, and your brakes will overheat on the long, punishing descent back toward the valley.
Why is the 4,765m altitude a risk for engines and drivers?
Reaching the 4,765m mark on this road means your engine will be starving for air. Naturally aspirated vehicles lose nearly half their horsepower at this height, making the climb out of the hairpins a slow and agonizing process. For the driver, the thin air at nearly 4,800 meters causes dizziness and fatigue, which are lethal on a road where a single steering error leads to a 500-meter fall. You must monitor your temperature gauge constantly, as the low atmospheric pressure causes radiators to boil over much faster, and a breakdown here means you are stranded in a remote sector of Lima with no cell service.
When is the most dangerous time to cross the Qullqi pass?
The "rainy season" in the Andes (December to March) makes this road a death trap. The 29 hairpins become a slippery mess of mud, and the risk of rockfalls from the towering Qullqi peak is constant. Even in the dry season, sudden high-altitude storms can bring snow and freezing temperatures to the 4,765m summit in a matter of minutes. This is a strictly self-sufficient route; you must carry extra fuel, a full-size spare tire, and enough supplies to survive a night in the cold. In the Huarochirí highlands, the mountain always has the final word, and the track past Qullqi is only open to those who respect its altitude and its isolation.