Devil's Causeway, Lost Lakes, and Chinese Wall Loop

The primary starting point for this loop is the Stillwater Trailhead. Parking is available there, but it's advisable to arrive early, especially during peak season, as it's a popular starting point for many trails in the area.

No, there are generally no permits or entrance fees required to hike within the Flat Tops Wilderness Area. However, standard wilderness regulations apply, such as Leave No Trace principles, and group size limits may be in effect. Always check with the local Forest Service office for the most current regulations before your trip.

Yes, dogs are generally allowed on this trail within the Flat Tops Wilderness. However, they must be kept on a leash to protect wildlife and ensure a pleasant experience for all hikers. Be aware that the Devil's Causeway section is extremely narrow and exposed, which could be challenging or dangerous for some dogs, especially larger ones or those not accustomed to heights. Ensure your dog is capable of handling the strenuous terrain and carry enough water for them.

The best time to hike this loop is typically from late June through September. During this period, the snow has usually melted, and the weather is more stable. July and August offer vibrant wildflowers, but also bring the highest chance of afternoon thunderstorms and mosquitoes. Early fall (September) can offer cooler temperatures and fewer bugs, but be prepared for colder nights and potential early snow. Always check the weather forecast before you go.

The terrain is incredibly diverse and challenging. It begins with relatively mellow sections along the East Fork Trail, transitioning to pine forests and wildflower fields. The most iconic part is the Devils Causeway itself, a natural land bridge that is extremely narrow (as little as 4 feet wide) and exposed, with sheer drops. Beyond this, the trail traverses the Chinese Wall, often through open, uneven high-alpine tundra where route-finding can be difficult. Expect significant elevation changes, rocky paths, and potentially muddy sections.

Given its distance of over 31 kilometers (approximately 22-26 miles) and significant elevation gain, this loop is generally undertaken as a multi-day backpacking trip, typically 2-3 days. While a very fit and fast hiker might complete it in a single long day (Komoot estimates around 9.5 hours moving time), most will find it too strenuous for a single-day effort, especially with the challenging terrain and exposure.

Key points of interest include the Stillwater Trailhead, the stunning Devils Causeway with its thrilling exposure, and the expansive Chinese Wall section. You'll also pass several beautiful alpine lakes, such as Causeway Lake, Little Causeway Lake, Round Lake, Long Lake, East Lost Lake, and West Lost Lake, many of which are popular camping spots.

Route-finding can be challenging, particularly on the high-alpine tundra sections of the Chinese Wall. The trail can become less defined or even disappear in places, especially above the tree line. It is highly recommended to download offline maps, carry a GPS device, and be proficient in navigation. Always pay close attention to cairns or trail markers where present.

While the trail passes several alpine lakes and streams, especially in the lower sections, water sources can become limited or unreliable in the higher, more exposed areas, particularly along the Chinese Wall. Always carry sufficient water for your planned duration and be prepared to filter or treat any water collected from natural sources.

The Devils Causeway is extremely exposed and not for those with a fear of heights. Take your time, watch your footing, and consider turning back if conditions are windy or wet. In general, be prepared for rapidly changing weather, including potential lightning storms on exposed ridgelines. Carry appropriate gear for all conditions, including rain gear, extra layers, and plenty of bug spray, as mosquitoes can be brutal near water sources.

Yes, this extensive loop incorporates sections of several official trails within the Flat Tops Wilderness. You will hike along parts of the Chinese Wall Trail, the East Fork Trail, the Lost Lakes Trail, the West Lost Lake Trail, and the Devils Causeway Trail. These connections allow for various route possibilities and access to other areas of the wilderness.