Exploring the Route of the Hiawatha: A Trail of Tunnels and Trestles
Tucked into the Bitterroot Mountains along the Idaho–Montana border, the Route of the Hiawatha is one of the most scenic and unique rail-trails in the United States. Often called a “bucket-list ride” for cyclists, this 15-mile downhill trail is famous not just for its breathtaking mountain views—but for its remarkable series of tunnels and towering trestle bridges that define the experience.
Keeping Score
The Route of the Hiawatha features:
- 10 tunnels
- 7 high steel trestle bridges
These structures are what make the trail truly unforgettable. Originally built as part of the Milwaukee Road railroad in the early 1900s, they were engineered to carry trains through rugged, mountainous terrain. Today, they give cyclists a rare chance to ride through history—literally.
The Tunnels: Riding Through Darkness and History
The tunnels on the Hiawatha trail vary in length and atmosphere, but they all add a sense of adventure. The most famous is the St. Paul Pass Tunnel (Taft Tunnel):
- Length: 1.66 miles (the longest tunnel on the trail)
- Location: Right at the trailhead
- Experience: Pitch black, cool, and often dripping with water
Riding through this tunnel is how every Hiawatha journey begins. With only your bike light guiding the way, it’s an immersive and slightly surreal experience. The temperature inside stays around 45°F year-round, offering a refreshing break on warm summer days.
The remaining nine tunnels are shorter but just as fun, each adding variety and rhythm to the ride.
The Trestles: Above the Wilderness
If the tunnels bring mystery, the bridges deliver awe.
The 7 steel trestle bridges span deep valleys and forested ravines, some rising over 200 feet above the ground. These crossings offer panoramic views of the surrounding mountains, making them prime photo opportunities—and unforgettable moments.
Highlights include:
- Sweeping views of the Bitterroots
- A sense of floating above the forest canopy
- Gentle grades that make crossings comfortable even for beginners
Why These Structures Matter
The tunnels and bridges aren’t just features—they’re the heart of the Hiawatha experience. Built between 1907 and 1911, they represent an incredible feat of engineering from the golden age of railroads. Transforming this former rail line into a bike trail preserved these historic elements while making them accessible to the public.
Tips for Riding the Hiawatha
If you’re planning your trip, keep these in mind:
- Bring a strong headlight and taillight – required for tunnels
- Dress in layers – tunnels are cold even in summer
- Take your time – the scenery (especially on bridges) is worth savoring
- Be prepared for a shuttle ride back – the trail is mostly downhill one way
How To: Experience The Route of the Hiawatha
Our Idaho Coeur d’Alene & the Hiawatha Bike Tour is a fully-supported 4-day cycling journey biking and exploring these incredible tunnels and trestles complete with two experienced guides, a support-and-gear vehicle, and comfortable lodging throughout the trip.
A perfect mix of scenery and history, we’ll also ride the lakeside paths around Lake Coeur d’Alene and explore mining towns like Kellogg and Wallace.
Final Thoughts
With 10 tunnels and 7 trestle bridges, the Route of the Hiawatha offers more than just a bike ride—it’s a journey through history, engineering, and some of the most beautiful landscapes in the Northwest. Whether you’re a casual rider or a cycling enthusiast, this trail delivers a one-of-a-kind adventure you won’t soon forget.
If you love the idea of riding through mountains, across sky-high bridges, and into the darkness of century-old tunnels, the Hiawatha is calling.
Wilderness Voyageurs Bike Tours operates Inn-to-Inn Bicycling Vacations across the United States.
If you want to experience the sights, sounds, culture, and geography of a place, what better way than from the saddle of your bike?
All Wilderness Voyageurs tours are fully supported with a Support-and-Gear vehicle and include beautiful routes through stunning landscape, excellent food and accommodations, top rate equipment, and dedicated and enthusiastic guides.
Give our wonderful reservations staff a call to book your next bike tour vacation (800) 272-4141