3.3
(9)
68
riders
Eureka loop
01:38
22.4km
200m
Cycling
Embark on the Eureka loop, a moderate touring bicycle route that takes you through the scenic San Juan National Forest. This 13.9-mile (22.4 km) journey involves a manageable 650 feet (198 metres) of elevation gain, typically completed in about 1 hour and 37 minutes. As you pedal, you will trace the course of the Animas River, with constant mountain vistas surrounding you. Keep an eye out for local wildlife, such as deer or marmots, as you explore the area. The route provides a pleasant cycling experience, blending natural beauty with historical intrigue.
To access the Eureka loop, you will travel along an 8-mile dirt road from Silverton to Eureka. This section is generally considered easy for touring bicycles, particularly if your bike has wider tires for better stability. Be prepared for some vehicle traffic on this road, as it is also suitable for passenger cars. It is important to note that the trail becomes significantly more rugged past Eureka and is not recommended for standard touring bicycles.
This route offers a unique opportunity to delve into the region's rich mining heritage. As you cycle, you will pass by remnants of old abandoned mines and the historic ghost town of Eureka itself. If your visit aligns with September, you can witness the San Juan Mountains ablaze with the vibrant colors of changing aspen leaves, adding another layer of beauty to your touring bicycle adventure.
Last updated: April 23, 2026
Waypoints
Start point
Parking
Get Directions
960 m
Silverton
Highlight • Settlement
The Blair Street Hostel provides shuttle service to and from Molas Pass for 5 Dollars or Stony Pass for 20 Dollars.
Tip by
14.3 km
Animas River
Highlight • River
Tip by
22.4 km
End point
Parking
Way Types & Surfaces
Way Types
18.6 km
3.68 km
158 m
Surfaces
8.51 km
6.79 km
6.62 km
476 m
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Elevation
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Weather
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Friday 15 May
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This route was planned by komoot.
Frequently Asked Questions
Is the Eureka loop suitable for beginner touring cyclists?
Yes, the section of the Eureka loop from Silverton to the historic Eureka Mine is considered very easy for beginners. It's a dirt road that is generally accessible to passenger cars, making it suitable for touring bikes, especially those with wider tires or gravel capabilities. Beyond Eureka, the route becomes much more challenging and is primarily for high-clearance 4x4 vehicles.
What is the terrain like on this touring bicycle route?
The terrain from Silverton to Eureka is primarily a dirt road, described as mildly rocky but fairly wide. It follows the Animas River. While generally easy, it's best suited for touring bikes equipped for varied surfaces, such as those with wider tires or gravel capabilities.
What scenic views or historical sites can I expect along the route?
You can expect spectacular natural beauty, including stunning mountain views and waterfalls. The route follows the Animas River. Historically, you'll pass old abandoned mines and ghost towns like Eureka and Sunnyside Mill, offering a glimpse into the area's rich mining past.
What wildlife might I see on the trail?
As you cycle along the Animas River, you might spot various wildlife such as deer, marmots, and large birds of prey. The San Juan Mountains are home to diverse animal species.
Where can I park to access the Eureka loop?
The Eureka loop typically starts near Silverton, Colorado. Parking is generally available within or near Silverton, which serves as a gateway to the San Juan Mountains. Specific parking areas may vary, so it's advisable to check local signage upon arrival.
What is the best time of year to cycle the Eureka loop?
The best time to cycle this route is generally during the warmer months. September is particularly picturesque when the aspen trees in the San Juan Mountains change color, offering stunning fall foliage views.
Are dogs allowed on the Eureka loop?
As this route is largely on County Roads within the San Juan National Forest, dogs are generally permitted. However, they should always be kept under control, preferably on a leash, to protect wildlife and ensure a pleasant experience for all users. Please practice Leave No Trace principles.
Do I need any permits or pay entrance fees for this trail?
The Eureka loop is located within the San Juan National Forest. Generally, there are no specific permits or entrance fees required for day-use cycling on the county roads that make up this route. However, always check the latest regulations from the US Forest Service for any updates or specific requirements for certain activities or areas within the National Forest.
Does the Eureka loop connect with other cycling routes?
Yes, the route utilizes sections of several local roads and trails. You will encounter parts of County Road 22, County Road 21, and County Road 23 (Maggie Gulch Road). It also briefly intersects with the Hardrock 100 Route, Lackawanna Road, and Boulder Gulch Trail.
How does the Eureka loop compare to the full Alpine Loop for cycling?
The Eureka loop, specifically the Silverton to Eureka section, is a much more accessible and easier cycling experience compared to the full Alpine Loop. The broader Alpine Loop is renowned for 4x4 enthusiasts and features rugged, high-clearance terrain largely unsuitable for standard touring bicycles beyond Eureka. This route offers a taste of the scenic San Juan Mountains without the extreme technical demands of the full Alpine Loop.
What amenities are available near the Eureka loop?
The town of Silverton, where the loop typically begins, offers various amenities. You can find cafes, pubs, restaurants, and accommodation options there. It's a good place to stock up on supplies before heading out on your ride.